The Chandra Deep Field-North survey. VII. X-ray emission from Lyman break galaxies

被引：77

作者：

Brandt, WN ^{[1
]}

Hornschemeier, AE ^{[1
]}

Schneider, DP ^{[1
]}

Alexander, DM ^{[1
]}

Bauer, FE ^{[1
]}

Garmire, GP ^{[1
]}

Vignali, C ^{[1
]}

机构：

[1] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 558卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

cosmology : observations; surveys; X-rays : galaxies; X-rays : general;

D O I：

10.1086/323570

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results from stacking analyses, using the I Ms Chandra Deep Field-North data, that constrain the X-ray emission of Lyman break galaxies at z approximate to 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 approximate to3.2 x 10(41) 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.

引用

页码：L5 / L9

页数：5

共 38 条

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