Very high redshift X-ray-selected active galactic nuclei in the Chandra Deep Field-North

被引：59

作者：

Barger, AJ

Cowie, LL

Capak, P

Alexander, DM

Bauer, FE

Brandt, WN

Garmire, GP

Hornschemeier, AE

机构：

[1] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[2] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA

[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

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

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 584卷 / 02期

关键词：

cosmology : observations; galaxies : active; galaxies : distances and redshifts; galaxies : evolution; galaxies : formation;

D O I：

10.1086/368407

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Deep Chandra X-ray exposures provide an efficient route for locating optically faint active galactic nuclei (AGNs) at high redshifts. We use deep multicolor optical data to search for z > 5 AGNs in the 2 Ms X-ray exposure of the Chandra Deep Field-North. Of the 423 X-ray sources bright enough (z' < 25.2) for a color-color analysis, at most one lies at z = 5-6, and none at z > 6. The one z > 5 object is spectroscopically confirmed at z = 5.19. Only 31 of the 77 sources with z' > 25.2 are undetected in the B or V bands at the 2 sigma level and could lie at z > 5. There are too few moderate-luminosity AGNs at z = 5-6.5 to ionize the intergalactic medium.

引用

页码：L61 / L64

页数：4

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