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The Chandra Deep Field North Survey. XI. X-ray emission from luminous infrared starburst galaxies

D. M. Alexander·H. Aussel·F. E. Bauer·W. N. Brandt·A. E. Hornschemeier·C. Vignali·G. P. Garmire·D. P. Schneider
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Abstract

Using the 1 Ms Chandra Deep Field North and 15 micron ISOCAM HDF-N surveys we find a tight correlation between the population of strongly evolving starbursts discovered in faint 15 micron ISOCAM surveys and the apparently normal galaxy population detected in deep X-ray surveys. Up to 100% of the X-ray detected emission-line galaxies (ELGs) have 15 micron counterparts, in contrast to 10-20% of the X-ray detected absorption-line galaxies and AGN-dominated sources. None of the X-ray detected ELGs is detected in the hard band (2-8 keV), and their stacked-average X-ray spectral slope of Gamma=2.0 suggests a low fraction of obscured AGN activity within the X-ray detected ELG population. The characteristics of the z=0.4-1.3 X-ray detected ELGs are consistent with those expected for M82 and NGC 3256-type starbursts; these X-ray detected ELGs contribute ~2% of the 0.5-8.0 keV X-ray background. The only statistical difference between the X-ray detected and X-ray undetected 15 micron selected ELGs is that a much larger fraction of the former have radio emission.

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D. M. Alexander, H. Aussel, F. E. Bauer, W. N. Brandt, A. E. Hornschemeier, C. Vignali, G. P. Garmire, D. P. Schneider. 2002-02-26. The Chandra Deep Field North Survey. XI. X-ray emission from luminous infrared starburst galaxies. https://doi.org/10.1086/340423

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