Galaxy Pairwise Velocity Distributions on Nonlinear Scales
نویسندگان
چکیده
منابع مشابه
Galaxy Pairwise Velocity Distributions on Non-linear Scales
The redshift-space correlation function ξs for projected galaxy separations <∼ 1h Mpc can be expressed as the convolution of the real-space correlation function with the galaxy pairwise velocity distribution function (PVDF). An exponential PVDF yields the best fit to the ξs measured from galaxy samples of different redshift surveys. We show that this exponential PVDF is not merely a fitting fun...
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We make predictions for the pairwise velocity dispersion (PVD) of galaxies with models that are constrained to match the projected correlation function and luminosity function of galaxies in the Two-Degree Field Galaxy Redshift Survey (2dFGRS). We use these data to constrain the halo occupation distribution (HOD) of 2dFGRS galaxies, then calculate the PVD by populating the halos of a large-volu...
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We present measurements of the pairwise velocity dispersion (PVD) for different classes of galaxies in the Sloan Digital Sky Survey (SDSS). For a sample of about 200,000 galaxies with redshifts in the interval 0.01 < z < 0.3, and r-band magnitudes M0.1 r between −16 and −23, we study the dependence of the PVD on galaxy properties such as luminosity, stellar mass (M∗), colour (g− r), 4000Å break...
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This paper provides two families of flexible and simple galaxy models. Representatives of many of the families possess the important cosmological cusps, with the density behaving like r−1 or r−4/3 or r−3/2 at small radii. The density falls off between r−3 and r−5 at large radii. We provide analytic and anisotropic distribution functions for all the models. Unlike many existing methods, our algo...
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The standard method of measuring the galaxy pairwise velocity dispersion on small scales via the anisotropy in the two-point correlation function in redshift space suffers from the fact that it is a pair-weighted statistic, and thus is heavily weighted by the densest regions in a way that is difficult to calibrate. We propose a new statistic, the redshift difference of close projected pairs of ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1996
ISSN: 0004-637X,1538-4357
DOI: 10.1086/177582