Optically faint sources in the Chandra Deep Field North Survey

Details Optically faint sources in the Chandra Deep Field North Survey Optically faint sources in the Chandra Deep Field North Survey

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.104a&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.

Computer Science

Active Galaxies And Quasars

Scientific paper

A considerable fraction (≈ 30%) of the sources that comprise the 0.5-8.0 keV X-ray background have optically faint (I>=24) counterparts. Here we present constraints on the nature of this source population using the 1 Ms Chandra Deep Field North observation. We find that the majority of the optically faint sources are likely to be obscured AGN at moderate redshift (z≈ 1-3), and a considerable fraction (10-50%) are probably obscured QSOs. Although these sources contribute to a significant fraction of the X-ray background radiation, we find that they are unlikely to be strong contributors to the far-infrared background. A number of sources have faint μJy radio counterparts, and we place constraints on the nature of the optically faint μJy source population.

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