GAIA A Stereoscopic Census of our Galaxy
... – ~1600 Earth-crossing asteroids > 1 km predicted (100 currently known) – GAIA detection: 260 - 590 m at 1 AU, depending on albedo OATo Seminars on formation and Evolution of the Galaxy ...
... – ~1600 Earth-crossing asteroids > 1 km predicted (100 currently known) – GAIA detection: 260 - 590 m at 1 AU, depending on albedo OATo Seminars on formation and Evolution of the Galaxy ...
The evolution of organic matter in space
... molecular synthesis [31–33]. Interstellar clouds constitute a few per cent of galactic mass and are composed primarily of H and He. They are enriched primarily by matter ejected from evolved stars and can vary strongly in their fundamental physical parameters such as temperature and density. Dominat ...
... molecular synthesis [31–33]. Interstellar clouds constitute a few per cent of galactic mass and are composed primarily of H and He. They are enriched primarily by matter ejected from evolved stars and can vary strongly in their fundamental physical parameters such as temperature and density. Dominat ...
from z=0 to z=1
... significantly higher SFR, higher attenuation, higher stellar mass, and higher correlation length than LBGs. 7. At intermediate redshifts of z~0.6, UV selected galaxies show moderate evolution in stellar mass in the sense that for a given luminosity, galaxies at z=0.6 have stellar mass ~2 times less ...
... significantly higher SFR, higher attenuation, higher stellar mass, and higher correlation length than LBGs. 7. At intermediate redshifts of z~0.6, UV selected galaxies show moderate evolution in stellar mass in the sense that for a given luminosity, galaxies at z=0.6 have stellar mass ~2 times less ...
Galaxies - hwchemistry
... – For example, studies of nearby galaxies show that an average galaxy like Milky Way has a luminosity about 16 billion times the sun’s. – If astronomers see a similar galaxy far away, they can measure its apparent magnitude and calculate its distance. ...
... – For example, studies of nearby galaxies show that an average galaxy like Milky Way has a luminosity about 16 billion times the sun’s. – If astronomers see a similar galaxy far away, they can measure its apparent magnitude and calculate its distance. ...
Quantitative constraints on starburst cycles in galaxies with stellar
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...
Homework #3, AST 1002
... Which of the following is (are) correct? (a) The cosmological redshift is caused by the expansion of space. (b) The larger the Hubble constant (H) is, the older the Universe. (c) The 3 degree background radiation arose at the time of inflation in the early universe. The correct answer(s) is(are) ___ ...
... Which of the following is (are) correct? (a) The cosmological redshift is caused by the expansion of space. (b) The larger the Hubble constant (H) is, the older the Universe. (c) The 3 degree background radiation arose at the time of inflation in the early universe. The correct answer(s) is(are) ___ ...
Far-ultraviolet and far-infrared bivariate luminosity function of galaxies:
... related to the star formation in galaxies, but in a very complicated manner. In order to disentangle the relation between FUV and FIR emissions, we estimate the UV-IR bivariate LF (BLF) of galaxies with GALEX and AKARI All-Sky Survey datasets. Recently, we developed a new mathematical method to cons ...
... related to the star formation in galaxies, but in a very complicated manner. In order to disentangle the relation between FUV and FIR emissions, we estimate the UV-IR bivariate LF (BLF) of galaxies with GALEX and AKARI All-Sky Survey datasets. Recently, we developed a new mathematical method to cons ...
ALFALFA H-alpha: The Star-Formation-Rate Density
... The Wesleyan Astronomy Department includes the most exciting and supportive professors I have met. Their interest in the field was infectious and drew me in. One class in particular – John Salzer’s Introduction to Astronomical Techniques – converted me to an astronomy major. For this and two years’ ...
... The Wesleyan Astronomy Department includes the most exciting and supportive professors I have met. Their interest in the field was infectious and drew me in. One class in particular – John Salzer’s Introduction to Astronomical Techniques – converted me to an astronomy major. For this and two years’ ...
Document
... Even the largest N-body simulation not big enough to produce one SDSS z~6 quasar… Today: 1.5 x 1015 M_sun cluster Much massive halos existed at z~6, but.. ...
... Even the largest N-body simulation not big enough to produce one SDSS z~6 quasar… Today: 1.5 x 1015 M_sun cluster Much massive halos existed at z~6, but.. ...
an introduction to astrophysics
... Note the important fact that in order to find two unknowns, two different equations relating them are required. By extension, it is always necessary to have as many equations as there are unknowns. You will find yourself constantly applying this principle as you solve numerical problems in astrophys ...
... Note the important fact that in order to find two unknowns, two different equations relating them are required. By extension, it is always necessary to have as many equations as there are unknowns. You will find yourself constantly applying this principle as you solve numerical problems in astrophys ...
Essential physics of early galaxy formation
... medium (IGM) or to be brought in by mergers to re-ignite further star formation. As halos build-up mass with time, their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficie ...
... medium (IGM) or to be brought in by mergers to re-ignite further star formation. As halos build-up mass with time, their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficie ...
EROs and submm galaxies: Expectations for FMOS in the
... SMGs: simulated FMOS spectrum of ELAIS N2 850.12 A simulated 7-hour spectrum produces lines and continuum with sufficient S/N to do science! The vast majority of SMGs should provide redshifts with FMOS. ...
... SMGs: simulated FMOS spectrum of ELAIS N2 850.12 A simulated 7-hour spectrum produces lines and continuum with sufficient S/N to do science! The vast majority of SMGs should provide redshifts with FMOS. ...
Black Hole Simulations for Gravitational Waves Modeling
... • Alexander Tolish: The Cosmological Memory Effect • Maciej Maliborski: The (in)stability of anti-de Sitter spacetime–resonant approximation • Stephen Green: Superradiant instabilities of asymptotically anti-de Sitter black holes • Jorge Rocha: Dynamics of confined double-shells systems, critical be ...
... • Alexander Tolish: The Cosmological Memory Effect • Maciej Maliborski: The (in)stability of anti-de Sitter spacetime–resonant approximation • Stephen Green: Superradiant instabilities of asymptotically anti-de Sitter black holes • Jorge Rocha: Dynamics of confined double-shells systems, critical be ...
Astronomical Picture of the Day
... galaxies Abell 1185. There at least two galaxies, cataloged as Arp 105 and dubbed The Guitar for their familiar appearance, are pulling each other apart gravitationally. Most of Abell 1185's hundreds of galaxies are elliptical galaxies, although spiral, lenticular, and irregular galaxies are all cle ...
... galaxies Abell 1185. There at least two galaxies, cataloged as Arp 105 and dubbed The Guitar for their familiar appearance, are pulling each other apart gravitationally. Most of Abell 1185's hundreds of galaxies are elliptical galaxies, although spiral, lenticular, and irregular galaxies are all cle ...
Chapter 14 Black Holes as Central Engines
... 14.4 Jets and Magnetic Fields A magnetic field cannot be anchored to the black hole itself because the event horizon pinches off any magnetic field lines that cross it. • However, the whirling plasma of the accretion disk lies outside the event horizon and it could have a strong magnetic field. • Th ...
... 14.4 Jets and Magnetic Fields A magnetic field cannot be anchored to the black hole itself because the event horizon pinches off any magnetic field lines that cross it. • However, the whirling plasma of the accretion disk lies outside the event horizon and it could have a strong magnetic field. • Th ...
Using time to measure distance - AS-A2
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
Hidden57_rf
... the narrow band of light that could penetrate the Earth’s atmosphere and was visible to our eyes or to sensitive photographic plates loaded at the focus of increasingly large telescopes. With these resources alone, the discoveries were still stupendous: the mapping of our Solar System, the identific ...
... the narrow band of light that could penetrate the Earth’s atmosphere and was visible to our eyes or to sensitive photographic plates loaded at the focus of increasingly large telescopes. With these resources alone, the discoveries were still stupendous: the mapping of our Solar System, the identific ...
Constraining the star formation histories of spiral bulges
... possibility is an initial mass function (IMF) biased towards highmass stars in the early stages of galaxy formation. In this scenario the first few generations of stars generate large quantities of metals (Gibson & Matteucci 1997; Vazdekis et al. 1997). Alternatively, a period of star formation (SF) ...
... possibility is an initial mass function (IMF) biased towards highmass stars in the early stages of galaxy formation. In this scenario the first few generations of stars generate large quantities of metals (Gibson & Matteucci 1997; Vazdekis et al. 1997). Alternatively, a period of star formation (SF) ...
IXO as an observatory in the large telescopes era
... At higher redshifts (z~2), it has been suggested from deep multi-wavelengths surveys that Comptonthick AGN at z~2 may be hiding among infrared bright, optically faint galaxies, although each object is generally too faint in X-rays to detect individually even with deepest Chandra exposures (e.g. Dadd ...
... At higher redshifts (z~2), it has been suggested from deep multi-wavelengths surveys that Comptonthick AGN at z~2 may be hiding among infrared bright, optically faint galaxies, although each object is generally too faint in X-rays to detect individually even with deepest Chandra exposures (e.g. Dadd ...
Chapter 24
... Like our own Galaxy, they are simply rich enough in interstellar gas to provide for continued stellar birth. Most spirals are not seen face-on, as they are shown in Figure 24.2. Many are tilted with respect to our line of sight, making their spiral structure hard to discern. However, we do not need ...
... Like our own Galaxy, they are simply rich enough in interstellar gas to provide for continued stellar birth. Most spirals are not seen face-on, as they are shown in Figure 24.2. Many are tilted with respect to our line of sight, making their spiral structure hard to discern. However, we do not need ...
A Spectroscopically Confirmed Excess of 24 micron Sources in a
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
Criteria for Core-Collapse Supernova Explosions
... before, during, and after explosion. At the onset of explosion in 2D, simulations have shown that this mechanism, the neutrino the heating efficiency is ~2\% to ~5\% and the mass in the gain region mechanism, fails in 1D. Since the mid 90s, 2D simulations that is ~0.005 M to ~0.01 M. Importantly, ...
... before, during, and after explosion. At the onset of explosion in 2D, simulations have shown that this mechanism, the neutrino the heating efficiency is ~2\% to ~5\% and the mass in the gain region mechanism, fails in 1D. Since the mid 90s, 2D simulations that is ~0.005 M to ~0.01 M. Importantly, ...
– 1 – 1. Galaxy Observations 1.1.
... is bimodal, suggesting a clear division between old and “dead” galaxies and galaxies with more recent star formation. Their second paper (Kaufmann, Heckman & White et al, 2003, MNRAS, 341, 54) proceeds to use the above characterizations to study the relations between stellar mass, star formation his ...
... is bimodal, suggesting a clear division between old and “dead” galaxies and galaxies with more recent star formation. Their second paper (Kaufmann, Heckman & White et al, 2003, MNRAS, 341, 54) proceeds to use the above characterizations to study the relations between stellar mass, star formation his ...
A Project Underway to Build an Inexpensive 8-Meter Telescope
... curves into redshift bins (~0.1) small enough that residual error in cosmological parameters are insignificant (see next slide), then perform a principle component analysis on the subsamples of ~10,000, and compare the results from different subsamples to gauge evolution. The quality of the data mig ...
... curves into redshift bins (~0.1) small enough that residual error in cosmological parameters are insignificant (see next slide), then perform a principle component analysis on the subsamples of ~10,000, and compare the results from different subsamples to gauge evolution. The quality of the data mig ...
exploring fundamental physics with neutron stars
... who are trained in the physics of microscopic systems of degenerate nucleons or high-energy particles, but are probably not familiar with astrophysical issues in general, and with the macroscopic behaviour of objects strongly bound by gravity in particular. Here, instead, we introduce the subject of ...
... who are trained in the physics of microscopic systems of degenerate nucleons or high-energy particles, but are probably not familiar with astrophysical issues in general, and with the macroscopic behaviour of objects strongly bound by gravity in particular. Here, instead, we introduce the subject of ...