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18 April 2024 |
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The Consequences of the Cosmic Star-Formation Rate: X-ray Number Counts | | A. Ptak
; R. Griffiths
; N. White
; P. Ghosh
; | | Date: |
18 Aug 2001 | | Subject: | astro-ph | | Abstract: | 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 > 1. Following White & 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 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 x 10^-18 ergs/s/cm^2 for galaxies in the HDF-N, which is consistent with a signal derived from a stacking analysis of the HDF-N Chandra data by Brandt et al. (2001). We also predict the number counts in deep X-ray surveys expected from normal galaxies at high redshift. | | Source: | arXiv, astro-ph/0108302 | | Services: | Forum | Review | PDF | Favorites | |
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