Quasars in the COSMOS Field

Details Quasars in the COSMOS Field Quasars in the COSMOS Field

2006-02-14

arxiv.org/abs/astro-ph/0602315v1

Astrophys.J. 644 (2006) 100-115

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ; emulateapj style; 25 pages, 13 figures, 4 tables

Scientific paper

10.1086/503325

We obtained medium-resolution spectra of 336 quasar candidates in the COSMOS HST/Treasury field using the MMT 6.5-meter telescope and the Hectospec multi-object spectrograph. Candidates were drawn from the Sloan Digital Sky Survey (SDSS) DR1 catalog using quasar flags set by the SDSS multi-color quasar target selection algorithm. In this paper we present our discovery spectra from 1.39 square degrees (69.5% of the COSMOS field) and a discussion of the selection method and yields. We confirmed 95 quasars, including at least 2 BALs; 80 of these are new quasars that do not appear in previous quasar confirmation follow-up studies. The candidates additionally included 184 compact emission-line galaxies, a third of which are likely Type 2 AGN, and 12 stars. The quasars span a range in magnitude of 18.3

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