搜索结果: 1-15 共查到“天体物理学 Luminosity”相关记录30条 . 查询时间(0.108 秒)
Comparing the Accretion Disk Evolution of Black Hole and Neutron Star X-ray Binaries from Low to Super-Eddington Luminosity
Accretion Disk Evolution Neutron Star X-ray Binaries Super-Eddington Luminosity
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2011/10/21
Low-mass X-ray binaries (LMXBs) are systems in which a low-mass companion transfers mass via Roche-lobe overflow onto a black hole (BH) or a weakly magnetized neutron star (NS). It is believed that bo...
A Halo Model of Local IRAS Galaxies Selected at 60 Micron Using Conditional Luminosity Functions
Local IRAS Galaxies Selected 60 Micron
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2011/1/11
Using conditional luminosity functions (CLFs) which encode the luminosity distribution of galaxies as a function of halo mass, we construct a halo model of IRAS galaxies selected at 60 micron. An abun...
The H-alpha Luminosity Function and Star-Formation Rate Volume Density at z=0.8 from the NEWFIRM H-alpha Survey
galaxies photometry — galaxies emission lines — galaxies distances and redshifts — galaxies
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2010/11/15
We present new measurements of the H luminosity function (LF) and star-formation rate (SFR)
volume density for galaxies at z ∼ 0.8. Our analysis is based on 1.18μm narrowband data from
the NE...
Interpreting the Evolution of the Size - Luminosity Relation for Disk Galaxies from Redshift 1 to the Present
galaxies evolution — galaxies formation — methods N-Body simulations
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2010/11/9
A sample of very high resolution cosmological disk galaxy simulations is used to investigate the evolution of galaxy disk sizes back to redshift 1 within the CDM cosmology. Artificial images in the r...
The mass-L_x relation for moderate luminosity X-ray clusters
mass-L_x relation moderate luminosity X-ray clusters
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2010/11/10
We present measurements of the masses of a sample of 25 moderate X-ray luminosity clusters of galaxies from the 160 square degree ROSAT survey. The masses were obtained from a weak lensing analysis of...
HIFLUGCS: Galaxy Cluster Scaling Relations between X-ray Luminosity, Gas Mass, Cluster Radius, and Velocity Dispersion
Cosmology observations — (Cosmology:) dark matter — Galaxies clusters: general — Methods
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2010/11/15
We present relations between X-ray luminosity and velocity dispersion (L − ), X-ray luminosity and gas mass (L − Mgas), and between cluster radius and velocity dispersion (r500 − )...
Probing the faint end of the quasar luminosity function at z ~ 4 in the COSMOS field
cosmology observations — quasars general — surveys
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2010/11/12
We searched for quasars that are 3 mag fainter than the SDSS quasars in the redshift range 3.7 . z . 4.7 in the COSMOS field to constrain the faint end of the quasar luminosity function.
X-ray spectral state is not correlated with luminosity in Holmberg II X-1
accretion accretion disks – black hole physics – X-rays binaries– X-rays
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2010/11/12
The ultraluminous X-ray source (ULX) Holmberg II X-1 has been observed over 4 months in 2009/2010 by the Swift observatory. The source luminosity varied by a factor of up to 14, reaching a maximum 0.3...
Reexamination of a Bound on the Dirac Neutrino Magnetic Moment from the Supernova Neutrino Luminosity
Reexamination of a Bound Neutrino Magnetic Moment Supernova Neutrino Luminosity
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2010/11/12
We investigate the neutrino helicity-flip process under supernova core conditions, where the left-handed neutrinos being produced can be converted into right-handed neutrinos sterile with respect to t...
Galaxy clustering and projected density profiles as traced by satellites in photometric surveys: Methodology and luminosity dependence
Galaxy clustering projected density profiles photometric surveys
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2010/11/12
We develop a new method which measures the projected density distribution wp(rp)n of photometric galaxies surrounding a set of spectroscopically-identified galaxies, and simultaneously the projected c...
Biases in the Quasar Mass-Luminosity Plane
black hole physics — galaxies evolution — galaxies nuclei — quasars general — accretion accretion discs
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2010/11/11
We report that the reported sub-Eddington boundary in the quasar mass-luminosity plane (a departure from the Eddington luminosity limit for the highest quasar black hole masses at a given redshift) is...
A Series Solution to the Luminosity Distance in a Flat LCDM Universe
Cosmological distances Numerical methods
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2010/11/15
Cosmological observations indicate that our universe is flat and dark energy (DE)
dominated at present. The luminosity distance plays an important role in the investigation
of the evolution and stru...
On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity AGNs
accretion accretion disks — black hole physics — galaxies active — quasars general — Ultraviolet general
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2010/11/12
Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncated thin disk, and a ...
Common Powering Mechanism of Intermediate Luminosity Optical Transients and Luminous Blue Variables
winds outflows— stars mass loss— stars vari-ables other — supernovae general
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2010/11/11
We study recent Intermediate Luminosity Optical Transients (ILOTs) and major eruptions of Luminous Blue Variables (LBVs), and strengthen claims for a similar powering mechanism. We study new ILOTs and...
The stellar evolution of Luminous Red Galaxies, and its dependence on colour, redshift, luminosity and modelling
galaxies evolution - cosmology observations - surveys
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2010/11/15
We present a series of colour evolution models for Luminous Red Galaxies (LRGs) in the 7th spectroscopic data release of the Sloan Digital Sky Survey (SDSS), computed using the full-spectrum fitting c...