Very High Redshift X-ray Selected AGN in the Chandra Deep Field-North

Details Very High Redshift X-ray Selected AGN in the Chandra Deep Field-North Very High Redshift X-ray Selected AGN in the Chandra Deep Field-North

2003-01-13

arxiv.org/abs/astro-ph/0301232v1

Astrophys.J. 584:L61-L64,2003

Astronomy and Astrophysics

Astrophysics

5 pages, accepted by The Astrophysical Journal Letters

Scientific paper

10.1086/368407

Deep Chandra X-ray exposures provide an efficient route for locating optically faint active galactic nuclei (AGN) at high redshifts. We use deep multicolor optical data to search for z>5 AGN 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 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 AGN at z=5-6.5 to ionize the intergalactic medium.

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