2004/04/30 by Stephen Boughn, S. P. Boughn, Robert Crittenden +1 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/422678
published as Astrophys.J. 612 (2004) 647-651 · 6 pages, 3 eps figures, accepted for ApJ, vol. 612, 10 September 2004
arxiv created 2004/06/09 · openalex publication_date 2004/09/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Recent deep X-ray surveys combined with spectroscopic identification of the sources have allowed the determination of the rest-frame 2-8 keV luminosity as a function of redshift. In addition, an analysis of the HEAO 1 A-2 2-10 keV full-sky map of the X-ray background reveals clustering on the scale of several degrees. Combining these two results in the context of the currently favored ΛCDM cosmological model implies an average X-ray bias factor b X of b = 1.12 ± 0.33, i.e., b X = 1.06 ± 0.16. These error estimates include only statistical error; the systematic error sources, while comparable, appear to be subdominant. This result is in contrast to the large biases of some previous estimates and is more in line with current estimates of the optical bias of L * galaxies.