A melhor ferramenta para a sua pesquisa, trabalho e TCC!
Página 1 dos resultados de 205305 itens digitais encontrados em 0.298 segundos
‣ Databases and tools for nuclear astrophysics applications BRUSsels Nuclear LIBrary (BRUSLIB), Nuclear Astrophysics Compilation of REactions II (NACRE II) and Nuclear NETwork GENerator (NETGEN)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 04/12/2012
Português
Relevância na Pesquisa
36.006072%
#Nuclear Theory#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Solar and Stellar Astrophysics#Nuclear Experiment
An update of a previous description of the BRUSLIB+NACRE package of nuclear
data for astrophysics and of the web-based nuclear network generator NETGEN is
presented. The new version of BRUSLIB contains the latest predictions of a wide
variety of nuclear data based on the most recent version of the
Brussels-Montreal Skyrme-HFB model. The nuclear masses, radii, spin/parities,
deformations, single-particle schemes, matter densities, nuclear level
densities, E1 strength functions, fission properties, and partition functions
are provided for all nuclei lying between the proton and neutron drip lines
over the 8<=Z<=110 range, whose evaluation is based on a unique microscopic
model that ensures a good compromise between accuracy, reliability, and
feasibility. In addition, these various ingredients are used to calculate about
100000 Hauser-Feshbach n-, p-, a-, and gamma-induced reaction rates based on
the reaction code TALYS. NACRE is superseded by the NACRE II compilation for 15
charged-particle transfer reactions and 19 charged-particle radiative captures
on stable targets with mass numbers A < 16. NACRE II features the inclusion of
experimental data made available after the publication of NACRE in 1999 and up
to 2011. In addition, the extrapolation of the available data to the very low
energies of astrophysical relevance is improved through the systematic use of
potential models. Uncertainties in the rates are also evaluated on this basis.
The latest release of the web-based tool NETGEN is presented. It contains in a
fully documented form the new BRUSLIB and NACRE II data...
Link permanente para citações:
‣ Roles and Needs of Laboratory Astrophysics in NASA's Space and Earth Science Mission
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/03/2009
Português
Relevância na Pesquisa
36.097139%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Earth and Planetary Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - High Energy Astrophysical Phenomena#Astrophysics - Solar and Stellar Astrophysics
Laboratory astrophysics and complementary theoretical calculations are the
foundations of astronomy and astrophysics and will remain so into the
foreseeable future. The mission enabling impact of laboratory astrophysics
ranges from the scientific conception stage for airborne and space-based
observatories, all the way through to the scientific return of these missions.
It is our understanding of the under-lying physical processes and the
measurements of critical physical parameters that allows us to address
fundamental questions in astronomy and astrophysics. In this regard, laboratory
astrophysics is much like detector and instrument development at NASA. These
efforts are necessary for the success of astronomical research being funded by
NASA. Without concomitant efforts in all three directions (observational
facilities, detector/instrument development, and laboratory astrophysics) the
future progress of astronomy and astrophysics is imperiled. In addition, new
developments in experimental technologies have allowed laboratory studies to
take on a new role as some questions which previously could only be studied
theoretically can now be addressed directly in the lab. With this in mind we,
the members of the AAS Working Group on Laboratory Astrophysics (WGLA)...
Link permanente para citações:
‣ Astronomy and Astrophysics in the Philosophy of Science
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 12/10/2015
Português
Relevância na Pesquisa
36.006072%
#Physics - History and Philosophy of Physics#Astrophysics - Astrophysics of Galaxies#Astrophysics - Instrumentation and Methods for Astrophysics
This article looks at philosophical aspects and questions that modern
astrophysical research gives rise to. Other than cosmology, astrophysics
particularly deals with understanding phenomena and processes operating at
"intermediate" cosmic scales, which has rarely aroused philosophical interest
so far. Being confronted with the attribution of antirealism by Ian Hacking
because of its observational nature, astrophysics is equipped with a
characteristic methodology that can cope with the missing possibility of direct
interaction with most objects of research. In its attempt to understand the
causal history of singular phenomena it resembles the historical sciences,
while the search for general causal relations with respect to classes of
processes or objects can rely on the "cosmic laboratory": the multitude of
different phenomena and environments, naturally provided by the universe.
Furthermore, the epistemology of astrophysics is strongly based on the use of
models and simulations and a complex treatment of large amounts of data.; Comment: 14 pages, This is a draft of a chapter "Astronomy and Astrophysics''
that has been accepted for publication by Oxford University Press in the
forthcoming book "The Oxford Handbook of Philosophy of Science'' edited by
Paul Humphreys due for publication in May 2016
Link permanente para citações:
‣ Laboratory Astrophysics White Paper (based on the 2010 NASA Laboratory Astrophysics Workshop in Gatlinberg, Tennessee, 25-28 October 2010)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/03/2011
Português
Relevância na Pesquisa
36.020867%
The purpose of the 2010 NASA Laboratory Astrophysics Workshop (LAW) was, as
given in the Charter from NASA, "to provide a forum within which the scientific
community can review the current state of knowledge in the field of Laboratory
Astrophysics, assess the critical data needs of NASA's current and future Space
Astrophysics missions, and identify the challenges and opportunities facing the
field as we begin a new decade". LAW 2010 was the fourth in a roughly
quadrennial series of such workshops sponsored by the Astrophysics Division of
the NASA Science Mission Directorate. In this White Paper, we report the
findings of the workshop.; Comment: 22 page White Paper from the 2010 NASA Laboratory Astrophysics
Workshop in Gatlinberg, Tennessee, 25-28 October 2010
Link permanente para citações:
‣ Laboratory Astrophysics and the State of Astronomy and Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 13/03/2009
Português
Relevância na Pesquisa
36.10399%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Earth and Planetary Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - High Energy Astrophysical Phenomena#Astrophysics - Solar and Stellar Astrophysics
Laboratory astrophysics and complementary theoretical calculations are the
foundations of astronomy and astrophysics and will remain so into the
foreseeable future. The impact of laboratory astrophysics ranges from the
scientific conception stage for ground-based, airborne, and space-based
observatories, all the way through to the scientific return of these projects
and missions. It is our understanding of the under-lying physical processes and
the measurements of critical physical parameters that allows us to address
fundamental questions in astronomy and astrophysics. In this regard, laboratory
astrophysics is much like detector and instrument development at NASA, NSF, and
DOE. These efforts are necessary for the success of astronomical research being
funded by the agencies. Without concomitant efforts in all three directions
(observational facilities, detector/instrument development, and laboratory
astrophysics) the future progress of astronomy and astrophysics is imperiled.
In addition, new developments in experimental technologies have allowed
laboratory studies to take on a new role as some questions which previously
could only be studied theoretically can now be addressed directly in the lab.
With this in mind we, the members of the AAS Working Group on Laboratory
Astrophysics...
Link permanente para citações:
‣ Managing Information for Sparsely Distributed Articles and Readers: The Virtual Journals of the Joint Institute for Nuclear Astrophysics (JINA)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 16/07/2009
Português
Relevância na Pesquisa
36.03302%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - Solar and Stellar Astrophysics#Computer Science - Digital Libraries#Nuclear Experiment#Nuclear Theory
The research area of nuclear astrophysics is characterized by a need for
information published in tens of journals in several fields and an extremely
dilute distribution of researchers. For these reasons it is difficult for
researchers, especially students, to be adequately informed of the relevant
published research. For example, the commonly employed journal club is
inefficient for a group consisting of a professor and his two students. In an
attempt to address this problem, we have developed a virtual journal (VJ), a
process for collecting and distributing a weekly compendium of articles of
interest to researchers in nuclear astrophysics. Subscribers are notified of
each VJ issue using an email-list server or an RSS feed. The VJ data base is
searchable by topics assigned by the editors, or by keywords. There are two
related VJs: the Virtual Journal of Nuclear Astrophysics (JINA VJ), and the
SEGUE Virtual Journal (SEGUE VJ). The JINA VJ also serves as a source of new
experimental and theoretical information for the JINA REACLIB reaction rate
database. References to review articles and popular level articles provide an
introduction to the literature for students. The VJs and support information
are available at http://groups.nscl.msu.edu/jina/journals; Comment: submitted...
Link permanente para citações:
‣ New Discoveries in Cosmology and Fundamental Physics through Advances in Laboratory Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/02/2009
Português
Relevância na Pesquisa
36.051802%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Cosmology and Nongalactic Astrophysics
As the Cosmology and Fundamental Physics (CFP) panel is fully aware, the next
decade will see major advances in our understanding of these areas of research.
To quote from their charge, these advances will occur in studies of the early
universe, the microwave background, the reionization and galaxy formation up to
virialization of protogalaxies, large scale structure, the intergalactic
medium, the determination of cosmological parameters, dark matter, dark energy,
tests of gravity, astronomically determined physical constants, and high energy
physics using astronomical messengers. Central to the progress in these areas
are the corresponding advances in laboratory astrophysics which are required
for fully realizing the CFP scientific opportunities within the decade
2010-2020. Laboratory astrophysics comprises both theoretical and experimental
studies of the underlying physics which produce the observed astrophysical
processes. The 5 areas of laboratory astrophysics which we have identified as
relevant to the CFP panel are atomic, molecular, plasma, nuclear, and particle
physics. Here, Section 2 describes some of the new scientific opportunities and
compelling scientific themes which will be enabled by advances in laboratory
astrophysics. In Section 3...
Link permanente para citações:
‣ Solid State Astrophysics: Probing Interstellar Dust and Gas Properties with X-rays
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/02/2009
Português
Relevância na Pesquisa
36.006072%
#Astrophysics - High Energy Astrophysical Phenomena#Astrophysics - Astrophysics of Galaxies#Astrophysics - Instrumentation and Methods for Astrophysics
The abundances of gas and dust (solids and complex molecules) in the
interstellar medium (ISM) as well as their composition and structures impact
practically all of astrophysics. Fundamental processes from star formation to
stellar winds to galaxy formation all scale with the number of metals. However,
significant uncertainties remain in both absolute and relative abundances, as
well as how these vary with environment, e.g., stellar photospheres versus the
interstellar medium (ISM). While UV, optical, IR, and radio studies have
considerably advanced our understanding of ISM gas and dust, they cannot
provide uniform results over the entire range of column densities needed. In
contrast, X-rays will penetrate gas and dust in the cold (3K) to hot
(100,000,000K) Universe over a wide range of column densities (log NH=20-24
cm^-2), imprinting spectral signatures that reflect the individual atoms which
make up the gas, molecule or solid. *X-rays therefore are a powerful and viable
resource for delving into a relatively unexplored regime for determining gas
abundances and dust properties such as composition, charge state, structure,
and quantity via absorption studies, and distribution via scattering halos.*; Comment: 8 pages, 6 figures. White paper submitted to the Astro2010 Decadal
survey for Astronomy and Astrophysics
Link permanente para citações:
‣ New Discoveries in Galaxies across Cosmic Time through Advances in Laboratory Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/02/2009
Português
Relevância na Pesquisa
36.051802%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Astrophysics of Galaxies
As the Galaxies across Cosmic Time (GCT) panel is fully aware, the next
decade will see major advances in our understanding of these areas of research.
To quote from their charge, these advances will occur in studies of the
formation, evolution, and global properties of galaxies and galaxy clusters, as
well as active galactic nuclei and QSOs, mergers, star formation rate, gas
accretion, and supermassive black holes. Central to the progress in these areas
are the corresponding advances in laboratory astrophysics that are required for
fully realizing the GCT scientific opportunities within the decade 2010-2020.
Laboratory astrophysics comprises both theoretical and experimental studies of
the underlying physics that produce the observed astrophysical processes. The 5
areas of laboratory astrophysics that we have identified as relevant to the CFP
panel are atomic, molecular, solid matter, plasma, nuclear, and particle
physics. In this white paper, we describe in Section 2 some of the new
scientific opportunities and compelling scientific themes that will be enabled
by advances in laboratory astrophysics. In Section 3, we provide the scientific
context for these opportunities. Section 4 briefly discusses some of the
experimental and theoretical advances in laboratory astrophysics required to
realize the GCT scientific opportunities of the next decade. As requested in
the Call for White Papers...
Link permanente para citações:
‣ New Discoveries in Stars and Stellar Evolution through Advances in Laboratory Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/02/2009
Português
Relevância na Pesquisa
36.05921%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Solar and Stellar Astrophysics
As the Stars and Stellar Evolution (SSE) panel is fully aware, the next
decade will see major advances in our understanding of these areas of research.
To quote from their charge, these advances will occur in studies of the Sun as
a star, stellar astrophysics, the structure and evolution of single and
multiple stars, compact objects, SNe, gamma-ray bursts, solar neutrinos, and
extreme physics on stellar scales. Central to the progress in these areas are
the corresponding advances in laboratory astrophysics, required to fully
realize the SSE scientific opportunities within the decade 2010-2020.
Laboratory astrophysics comprises both theoretical and experimental studies of
the underlying physics that produces the observed astrophysical processes. The
6 areas of laboratory astrophysics, which we have identified as relevant to the
CFP panel, are atomic, molecular, solid matter, plasma, nuclear physics, and
particle physics. In this white paper, we describe in Section 2 the scientific
context and some of the new scientific opportunities and compelling scientific
themes which will be enabled by advances in laboratory astrophysics. In Section
3, we discuss some of the experimental and theoretical advances in laboratory
astrophysics required to realize the SSE scientific opportunities of the next
decade. As requested in the Call for White Papers...
Link permanente para citações:
‣ New Discoveries in the Galactic Neighborhood through Advances in Laboratory Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/02/2009
Português
Relevância na Pesquisa
36.051802%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Astrophysics of Galaxies
As the Galactic Neighborhood (GAN) panel is fully aware, the next decade will
see major advances in our understanding of this area of research. To quote from
their charge, these advances will occur in studies of the galactic
neighborhood, including the structure and properties of the Milky Way and
nearby galaxies, and their stellar populations and evolution, as well as
interstellar media and star clusters. Central to the progress in these areas
are the corresponding advances in laboratory astrophysics that are required for
fully realizing the GAN scientific opportunities within the decade 2010-2020.
Laboratory astrophysics comprises both theoretical and experimental studies of
the underlying physics and chemistry that produces the observed astrophysical
processes. The 5 areas of laboratory astrophysics that we have identified as
relevant to the GAN panel are atomic, molecular, solid matter, plasma, and
nuclear physics. In this white paper, we describe in Section 2 some of the new
scientific opportunities and compelling scientific themes that will be enabled
by advances in laboratory astrophysics. In Section 3, we provide the scientific
context for these opportunities. Section 4 briefly discusses some of the
experimental and theoretical advances in laboratory astrophysics required to
realize the GAN scientific opportunities of the next decade. As requested in
the Call for White Papers...
Link permanente para citações:
‣ New Discoveries in Planetary Systems and Star Formation through Advances in Laboratory Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 27/02/2009
Português
Relevância na Pesquisa
36.020867%
As the panel on Planetary Systems and Star Formation (PSF) is fully aware,
the next decade will see major advances in our understanding of these areas of
research. To quote from their charge, these advances will occur in studies of
solar system bodies (other than the Sun) and extrasolar planets, debris disks,
exobiology, the formation of individual stars, protostellar and protoplanetary
disks, molecular clouds and the cold ISM, dust, and astrochemistry. Central to
the progress in these areas are the corresponding advances in laboratory astro-
physics which are required for fully realizing the PSF scientific opportunities
in the decade 2010-2020. Laboratory astrophysics comprises both theoretical and
experimental studies of the underlying physics and chemistry which produce the
observed spectra and describe the astrophysical processes. We discuss four
areas of laboratory astrophysics relevant to the PSF panel: atomic, molecular,
solid matter, and plasma physics. Section 2 describes some of the new
opportunities and compelling themes which will be enabled by advances in
laboratory astrophysics. Section 3 provides the scientific context for these
opportunities. Section 4 discusses some experimental and theoretical advances
in laboratory astrophysics required to realize the PSF scientific opportunities
of the next decade. As requested in the Call for White Papers...
Link permanente para citações:
‣ Foreword: Advanced Science Letters (ASL), Special Issue on Computational Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 24/06/2009
Português
Relevância na Pesquisa
36.03302%
#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Earth and Planetary Astrophysics
Computational astrophysics has undergone unprecedented development over the
last decade, becoming a field of its own. The challenge ahead of us will
involve increasingly complex multi-scale simulations. These will bridge the gap
between areas of astrophysics such as star and planet formation, or star
formation and galaxy formation, that have evolved separately until today. A
global knowledge of the physics and modeling techniques of astrophysical
simulations is thus an important asset for the next generation of modelers.
With the aim at fostering such a global approach, we present the Special Issue
on Computational Astrophysics for the Advanced Science Letters
(http://www.aspbs.com/science.htm). The Advanced Science Letters (ASL) is a new
multi-disciplinary scientific journal which will cover extensively
computational astrophysics and cosmology, and will act as a forum for the
presentation and discussion of novel work attempting to connect different
research areas. This Special Issue collects 9 reviews on 9 key topics of modern
astrophysics and cosmology in which simulations have had a pivotal
contribution. From asteroid collisions to the formation of stars, from the
physics and origin of galaxy clusters to large-scale phenomena such as the
reionization of the Universe...
Link permanente para citações:
‣ Modules for Experiments in Stellar Astrophysics (MESA)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 08/09/2010
Português
Relevância na Pesquisa
36.006072%
#Astrophysics - Solar and Stellar Astrophysics#Astrophysics - Instrumentation and Methods for Astrophysics
Stellar physics and evolution calculations enable a broad range of research
in astrophysics. Modules for Experiments in Stellar Astrophysics (MESA) is a
suite of open source libraries for a wide range of applications in
computational stellar astrophysics. A newly designed 1-D stellar evolution
module, MESA star, combines many of the numerical and physics modules for
simulations of a wide range of stellar evolution scenarios ranging from
very-low mass to massive stars, including advanced evolutionary phases. MESA
star solves the fully coupled structure and composition equations
simultaneously. It uses adaptive mesh refinement and sophisticated timestep
controls, and supports shared memory parallelism based on OpenMP. Independently
usable modules provide equation of state, opacity, nuclear reaction rates, and
atmosphere boundary conditions. Each module is constructed as a separate
Fortran 95 library with its own public interface. Examples include comparisons
to other codes and show evolutionary tracks of very low mass stars, brown
dwarfs, and gas giant planets; the complete evolution of a 1 Msun star from the
pre-main sequence to a cooling white dwarf; the Solar sound speed profile; the
evolution of intermediate mass stars through the thermal pulses on the He-shell
burning AGB phase; the interior structure of slowly pulsating B Stars and Beta
Cepheids; evolutionary tracks of massive stars from the pre-main sequence to
the onset of core collapse; stars undergoing Roche lobe overflow; and accretion
onto a neutron star. Instructions for downloading and installing MESA can be
found on the project web site (http://mesa.sourceforge.net/).; Comment: 110 pages...
Link permanente para citações:
‣ "An Era of Precision Astrophysics: Connecting Stars, Galaxies and the Universe," an Astro2010 Science White Paper
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/02/2009
Português
Relevância na Pesquisa
36.03302%
Abridged: The golden age of astrophysics is upon us with both grand
discoveries (extra-solar planets, dark matter, dark energy) and precision
cosmology. Fundamental understanding of the working of stars and galaxies is
within reach, thanks to newly available precision measurements. We highlight
the importance of distances and model independent distances and masses.
Distances are fundamental in astrophysics and their knowledge can change our
perception of phenomena dramatically: e.g., in antiquity, the Heliocentric
model was rejected because the predicted stellar parallaxes were not observed.
Distance measurements are directly related to the history & fate of the uni-
verse as they provide 2 of 3 methods available to date the universe. The 1st
method is based on the ages of stars, which can be ascertained if their lumi-
nosities (distances) are accurately known. The 2nd method relies on cosmolo-
gical methods. To 1st order, the age of the universe is the inverse H_0.
As stressed by the previous decadal report, "the fundamental goal of ...
astrophysics is to understand how the universe ... galaxies [and] stars ...
formed, how they evolved, and what their destiny will be." These questions can
be answered partly by micro-arcsecond astrometry: 1) Galactic archeology: a
detailed reconstruction of the formation history of the Milky Way and other
Local Group galaxies...
Link permanente para citações:
‣ Science from the Moon: The NASA/NLSI Lunar University Network for Astrophysics Research (LUNAR)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 08/09/2009
Português
Relevância na Pesquisa
36.03302%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Solar and Stellar Astrophysics
The Moon is a unique platform for fundamental astrophysical measurements of
gravitation, the Sun, and the Universe. Lacking a permanent ionosphere and, on
the farside, shielded from terrestrial radio emissions, a radio telescope on
the Moon will be an unparalleled heliospheric and astrophysical observatory.
Crucial stages in particle acceleration near the Sun can be imaged and tracked.
The evolution of the Universe before and during the formation of the first
stars will be traced, yielding high precision cosmological constraints. Lunar
Laser Ranging of the Earth-Moon distance provides extremely high precision
constraints on General Relativity and alternative models of gravity, and also
reveals details about the interior structure of the Moon. With the aim of
providing additional perspective on the Moon as a scientific platform, this
white paper describes key research projects in these areas of astrophysics from
the Moon that are being undertaken by the NLSI-funded LUNAR consortium. The
NASA Lunar Science Institute (NLSI) recently funded 7 mostly university-based
teams to study science of, on, and from the Moon. The LUNAR consortium was
selected by the NLSI for astrophysical research and education that focuses on
the key, unique instruments that most effectively take scientific advantage of
sites on the lunar surface - low frequency heliophysics and cosmology...
Link permanente para citações:
‣ High Time Resolution Astrophysics in the Extremely Large Telescope Era : White Paper
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.006072%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - High Energy Astrophysical Phenomena
High Time Resolution Astrophysics (HTRA) concerns itself with observations on
short scales normally defined as being lower than the conventional read-out
time of a CCD. As such it is concerned with condensed objects such as neutron
stars, black holes and white dwarfs, surfaces with extreme magnetic
reconnection phenomena, as well as with planetary scale objects through
transits and occultations. HTRA is the only way to make a major step forward in
our understanding of several important astrophysical and physical processes;
these include the extreme gravity conditions around neutron stars and stable
orbits around stellar mass black holes. Transits, involving fast timing, can
give vital information on the size of, and satellites around exoplanets. In the
realm of fundamental physics very interesting applications lie in the regime of
ultra-high time resolution, where quantum-physical phenomena, currently studied
in laboratory physics, may be explored. HTRA science covers the full gamut of
observational optical/IR astronomy from asteroids to {\gamma}-rays bursts,
contributing to four out of six of AstroNet's fundamental challenges described
in their Science Vision for European Astronomy. Giving the European-Extremely
Large Telescope (E-ELT) an HTRA capability is therefore importance. We suggest
that there are three possibilities for HTRA and E-ELT. These are...
Link permanente para citações:
‣ Unique Astrophysics in the Lyman Ultraviolet
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 14/09/2012
Português
Relevância na Pesquisa
36.020867%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Solar and Stellar Astrophysics
There is unique and groundbreaking science to be done with a new generation
of UV spectrographs that cover wavelengths in the "Lyman Ultraviolet" (LUV; 912
- 1216 Ang). There is no astrophysical basis for truncating spectroscopic
wavelength coverage anywhere between the atmospheric cutoff (3100 Ang) and the
Lyman limit (912 Ang); the usual reasons this happens are all technical. The
unique science available in the LUV includes critical problems in astrophysics
ranging from the habitability of exoplanets to the reionization of the IGM.
Crucially, the local Universe (z <= 0.1) is entirely closed to many key
physical diagnostics without access to the LUV. These compelling scientific
problems require overcoming these technical barriers so that future UV
spectrographs can extend coverage to the Lyman limit at 912 Ang.; Comment: Science white paper submitted to NASA Solicitation NNH12ZDA008L:
Science Objectives and Requirements for the Next NASA UV/Visible Astrophysics
Mission Concepts. 6 pages PDF
Link permanente para citações:
‣ Astrophysics Conducted by the Lunar University Network for Astrophysics Research (LUNAR) and the Center for Lunar Origins (CLOE)
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 11/09/2012
Português
Relevância na Pesquisa
36.051802%
#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Earth and Planetary Astrophysics#Astrophysics - Instrumentation and Methods for Astrophysics
[Abridged] The Moon is a unique platform from and on which to conduct
astrophysical measurements. The Lunar University Network for Astrophysics
Research (LUNAR) and the Center for Lunar Origins and Evolution (CLOE) teams
within the NASA Lunar Science Institute (NLSI) are illustrating how the Moon
can be used as a platform to advance important goals in astrophysics. Of
relevance to Astrophysics and aligned with NASA strategic goals, all three of
the primary research themes articulated by New Worlds, New Horizons in
Astronomy & Astrophysics are being addressed by LUNAR and CLOE, namely Probing
Cosmic Dawn, Understanding New Worlds, and Physics of the Universe; Comment: 24 page white paper for NASA Lunar Science Institute
Link permanente para citações:
‣ Shape: A 3D Modeling Tool for Astrophysics
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 09/03/2010
Português
Relevância na Pesquisa
36.006072%
#Astrophysics - Instrumentation and Methods for Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - Solar and Stellar Astrophysics
We present a flexible interactive 3D morpho-kinematical modeling application
for astrophysics. Compared to other systems, our application reduces the
restrictions on the physical assumptions, data type and amount that is required
for a reconstruction of an object's morphology. It is one of the first publicly
available tools to apply interactive graphics to astrophysical modeling. The
tool allows astrophysicists to provide a-priori knowledge about the object by
interactively defining 3D structural elements. By direct comparison of model
prediction with observational data, model parameters can then be automatically
optimized to fit the observation. The tool has already been successfully used
in a number of astrophysical research projects.; Comment: 13 pages, 11 figures, accepted for publication in the "IEEE
Transactions on Visualization and Computer Graphics"
Link permanente para citações: