Angular two-point correlation of NVSS galaxies revisited

被引：21
作者：
Chen, Song [1 ]
Schwarz, Dominik J. [1 ]
机构：
[1] Univ Bielefeld, Fak Phys, Postfach 100131, D-33501 Bielefeld, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2016年 / 591卷
关键词：
galaxies: statistics; radio continuum: galaxies; large-scale structure of Universe; PROBE WMAP OBSERVATIONS; RADIO GALAXIES; POWER SPECTRUM; ANISOTROPY; DIPOLE;
D O I：
10.1051/0004-6361/201526956
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We measure the angular two-point correlation and angular power spectrum from the NRAO VLA Sky Survey (NVSS) of radio galaxies. They are found to be consistent with the best-fit cosmological model from the Planck analysis, and with the redshift distribution obtained from the Combined EIS-NVSS Survey Of Radio Sources (CENSORS). Our analysis is based on an optimal estimation of the two-point correlation function and makes use of a new mask that takes into account direction dependent effects of the observations, sidelobe effects of bright sources and galactic foreground. We also set a flux threshold and take the cosmic radio dipole into account. The latter turns out to be an essential step in the analysis. This improved cosmological analysis of the NVSS emphasizes the importance of a flux calibration that is robust and stable on large angular scales for future radio continuum surveys.
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页数：11
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