The Chandra deep field-north survey. VII. X-ray emission from Lyman break galaxies

W. N. Brandt, A. E. Hornschemeier, D. P. Schneider, D. M. Alexander, F. E. Bauer, G. P. Garmire, C. Vignali

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77 Scopus citations


We present results from stacking analyses, using the 1 Ms Chandra Deep Field-North data, that constrain the X-ray emission of Lyman break galaxies at z ≈ 2-4. Stacking the counts from 24 individually undetected Lyman break galaxies located within the Hubble Deep Field-North, we have obtained average detections of these objects in the resulting 0.5-8.0 and 0.5-2.0 keV images; these images have effective exposure times of 22.4 Ms (260 days). Monte Carlo testing empirically shows the detections to be highly significant. The average rest-frame 2-8 keV luminosity of a Lyman break galaxy is derived to be ≈3.2 × 1041 ergs s-1, comparable to that of the most X-ray luminous starbursts in the local universe. The observed ratio of X-ray to B-band luminosity is somewhat, but not greatly, higher than that seen from local starbursts. The X-ray emission probably arises from a combination of high-mass X-ray binaries, "super-Eddington" X-ray sources, and low-luminosity active galactic nuclei.

Original languageEnglish (US)
Pages (from-to)L5-L9
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - Sep 1 2001

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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