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On the fairness of the main galaxy sample of SDSS
Meng, Ke-Lai1; Ma, Bin2; Pan, Jun1; Feng, Long-Long1
AbstractFlux-limited and volume-limited galaxy samples are constructed from the Sloan Digital Sky Survey (SDSS) data releases DR4, DR6 and DR7 for statistical analysis. The two-point correlation functions xi(s), monopole of three-point correlation functions zeta(0), projected two-point correlation function w(p) and pairwise velocity dispersion sigma(12) are measured to test if galaxy samples are fair for these statistics. We find that with the increment of sky coverage of subsequent data releases in SDSS, xi(s) of the flux-limited sample is extremely robust and insensitive to local structures at low redshift. However, for volume-limited samples fainter than L* at large scales s greater than or similar to 10 h(-1) Mpc, the deviation of xi(s) from different SDSS data releases (DR7, DR6 and DR4) increases with the increment of absolute magnitude. The case of zeta(0)(s) is similar to that of xi(s). In the weakly nonlinear regime, there is no agreement between zeta(0) of different data releases in all luminosity bins. Furthermore, w(p) of volume-limited samples of DR7 in luminosity bins fainter than -M-r,M-0.1 = [18.5, 19.5] are significantly larger and sigma(12) of the two faintest volume-limited samples of DR7 display a very different scale dependence than results from DR4 and DR6. Our findings call for caution in understanding clustering analysis results of SDSS faint galaxy samples and higher order statistics of SDSS volume-limited samples in the weakly nonlinear regime. The first zero-crossing points of xi(s) from volume-limited samples are also investigated and discussed.
KeywordGalaxies: Distances And Redshifts Galaxies: Statistics Cosmology: Observation Cosmology: Large-scale Structure
Indexed BySCI
WOS IDWOS:000291963900005
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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GB/T 7714
Meng, Ke-Lai,Ma, Bin,Pan, Jun,et al. On the fairness of the main galaxy sample of SDSS[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(6):655-670.
APA Meng, Ke-Lai,Ma, Bin,Pan, Jun,&Feng, Long-Long.(2011).On the fairness of the main galaxy sample of SDSS.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(6),655-670.
MLA Meng, Ke-Lai,et al."On the fairness of the main galaxy sample of SDSS".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.6(2011):655-670.
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