搜索结果: 1-15 共查到“天体物理学 Relation”相关记录19条 . 查询时间(0.122 秒)
The Age-Metallicity Relation in the Thin Disk of the Galaxy
metallicity relation thin disk of the Galaxy
2011/9/30
HST trigonometric distances, photometric metallicities, isochronic ages from the second revised version of the Geneva--Copenhagen survey, and uniform spectroscopic Fe and Mg abundances from our master...
An optical/NIR survey of globular clusters in early-type galaxies II. Ages of GC systems and the relation to galaxy morphology
globular clusters early-type galaxies II
2011/1/10
Context: Some photometric studies of extragalactic globular cluster (GC) systems using the optical and near-infrared colour combination have suggested the presence of a large fraction of intermediate-...
The Mass-Radius(-Rotation?) Relation for Low-Mass Stars
Mass-Radius Relation Low-Mass Stars
2010/11/15
The fundamental properties of low-mass stars are not as well understood as those of their more
massive counterparts. The best method for constraining these properties, especially masses and radii,is ...
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
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
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...
How Universal is the SFR - H2 Relation?
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Galaxy Astrophysics (astro-ph.GA)
2010/12/27
It is a well established empirical fact that the surface density of the star formation rate, Sigma_SFR, strongly correlates with the surface density of molecular hydrogen, Sigma_H2, at least when aver...
The Relation Between Charged Particles and Muons With Threshold Energy 1 GeV in Extensive Air Showers Registered at the Yakutsk EAS Array
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/24
Characteristics of the muon component in EAS are analyzed together with their fluctuations. The aim of this analysis -- a comparison of experimental data with computational results obtained within fra...
The M_BH-M_star relation of obscured AGNs at high redshift
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Galaxy Astrophysics (astro-ph.GA)
2010/12/24
We report the detection of broad Halpha emission in three X-ray selected obscured AGNs at z=1-2. By exploiting the Halpha width and the intrinsic X-ray luminosity, we estimate their black hole masses,...
The Impact of Cluster Structure and Dynamical State on Scatter in the Sunyaev-Zel'dovich Flux-Mass Relation
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/23
Cosmological constraints from cluster surveys rely on accurate mass estimates from the mass-observable relations. In order to avoid systematic biases and reduce uncertainties, we study the form and ph...
Color Magnitude Relation and Morphology of Low-Redshift ULIRGs in SDSS
Color Magnitude Relation Low-Redshift ULIRGs
2010/3/8
We present color-magnitude and morphological analysis of 54 low-redshift ULIRGs, a subset of the IRAS 1Jy sample (Kim & Sanders, 1998), in the SDSS. The ULIRGs are on average 1 magnitude brighter in M...
Consistency relation for the Lorentz invariant single-field inflation
shape bispectrum Lorentz invariant single-field inflation
2010/3/19
In this paper we compute the sizes of equilateral and orthogonal shape bispectrum for the general Lorentz invariant single-field inflation. The stability of field theory implies a non-negative square ...
On the final definition of the causal boundary and its relation with the conformal boundary
causal structure Kronheimer and Penrose construction chronological sets and completions causal boundary conformal boundary globally hyperbolic spacetimes naked singularities Penrose-Carter diagrams
2010/3/19
The notion of causal boundary $\partial M$ for a strongly causal spacetime $M$ has been a controversial topic along last decades: on one hand, some attempted definitions were not fully consistent, on ...
A Comprehensive Analysis of Uncertainties Affecting the Stellar Mass - Halo Mass Relation for 0
dark matter galaxies abundances galaxies evolution galaxies stellar content methods N-body simulations
2010/3/8
We conduct a comprehensive analysis of the relationship between central galaxies and their host dark matter halos, as characterized by the stellar mass-halo mass (SM-HM) relation, with rigorous consid...
PAH Emission in AGN and Starbursts, and their relation with the mid-infrared continuum emission
PAH Emission AGN Starbursts
2009/7/9
PAH Emission in AGN and Starbursts, and their relation with the mid-infrared continuum emission。
Spectroscopic Study of C IVλ1549 and its Relation with Optical Parameters in Active Galactic Nuclei
Spectroscopic Optical Parameters C IVλ1549
2009/7/9
Spectroscopic Study of C IVλ1549 and its Relation with Optical Parameters in Active Galactic Nuclei。