2001/08/18 by A. Ptak, R. Griffiths, R. E. Griffiths +4
Physics and Astronomy · #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.1086/323893
Accepted for publication in ApJ Letters. Formatted with emulateapj5. 5 pages with 4 figures. Also available at ftp://xassist.pha.jhu.edu/pub/ptak/xrb_gal_evolution_preprint.ps
arxiv created 2001/08/18 · openalex publication_date 2001/10/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
We discuss the observable consequences for the detection of galaxies in the X-ray bandpass resulting from a peak in the cosmic star formation rate at a redshift greater than 1. Following N. White and P. Ghosh, we assume a large evolution in the X-ray/ B luminosity ratio at z ~ 0.5-1.5 resulting from the X-ray binaries that have evolved from stars formed at z > 1-2. Using the Hubble Deep Field-North (HDF-N) redshift survey data and the locally observed X-ray/ B luminosity ratio as a guide, we estimate a median X-ray flux (2-10 keV) on the order of 8 × 10 -18 ergs cm -2 s -1 for galaxies in the HDF-N, which is consistent with a signal derived from a recent stacking analysis of the HDF-N Chandra data by N. Brandt and coworkers. We also predict the number counts in deep X-ray surveys expected from normal galaxies at high redshift.