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Article overview
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On the fairness of the main galaxy sample of SDSS | | Kelai Meng
; Bin Ma
; Jun Pan
; Longlong Feng
; | | Date: |
12 Oct 2010 | | Abstract: | In order to measure fairness of the main galaxy sample of SDSS, series of
flux-limited and volume-limited samples are constructed from SDSS data releases
DR4, DR6 and DR7 for analysis with various statistics: two-point correlation
functions $xi(s)$ and monopole of three-point correlation functions $zeta_0$
in redshift space, projected two-point correlation function $w_p$ and pairwise
velocity dispersion $sigma_{12}$. We find that with the expansion of sky
coverage of SDSS, $xi(s)$ of flux-limited sample is extremely robust against
sample volume change and insensitive to local structures at low redshift. For
volume-limited samples, $xi(s)$ of SDSS DR7 in luminosity bins brighter than
$-M_{r,0.1}=[17,18]$ are in good agreement with earlier data releases at scales
$s< sim 10hmpc$, while at larger scales the consistency is broken for samples
dimmer than $L^*$, the deviation of DR7 to DR6 and DR4 grows with larger
absolute magnitude. Volume-limited samples of SDSS display convergence in
$zeta_0$ at scales $s<sim 10hmpc$ except the one in the faintest luminosity
bin, but in the weakly nonlinear regime, there is no agreement between
$zeta_0$ of different data releases in all luminosity bins. $w_p$ of
volume-limited samples in luminosity bins brighter than
$-M_{r,0.1}=[18.5,19.5]$ are robust against data version, while for samples in
dimmer bins, $w_p$ of DR7 are significantly larger. $sigma_{12}$ of the two
faintest volume-limited samples also show much steeper scale dependence in DR7
and then become flatter at higher luminosity... | | Source: | arXiv, 1010.2299 | | Services: | Forum | Review | PDF | Favorites | |
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