The [ITAL]Chandra[/ITAL] 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
2001 Astrophysical Journal  
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 keV 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
more » ... 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 x 10^{41} erg 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.
doi:10.1086/323570 fatcat:uinipewn6vcxbipujt6b5ejcua