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

Research output: Contribution to journalReview articlepeer-review

61 Scopus citations

Abstract

Using the 1 Ms Chandra Deep Field-North and 15 μm ISOCAM Hubble Deep Field-North surveys, we find a tight correlation between the population of strongly evolving starburst galaxiess discovered in faint 15 μm 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 mm 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 are detected in the hard band (2-8 keV), and their stacked-average X-ray spectral slope of Γ ≈ 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 starburst galaxies; these X-ray-detected ELGs contribute ≈2% of the 0.5-8.0 keV extragalactic X-ray background. The only statistical difference between the X-ray-detected and X-ray-undetected 15 μm-selected ELGs is that a much larger fraction of the former have radio emission.

Original languageEnglish (US)
Pages (from-to)L85-L88
JournalAstrophysical Journal
Volume568
Issue number2 II
DOIs
StatePublished - Apr 1 2002

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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