Open AccessMagellan Spectroscopy of AGN Candidates in the COSMOS Field
Author(s) -
Jonathan R. Trump,
Chris Impey,
Patrick J. McCarthy,
M. Elvis,
J. P. Huchra,
M. Brusa,
G. Hasinger,
E. Schinnerer,
P. Capak,
S. J. Lilly,
N. Z. Scoville
Publication year - 2007
Publication title -
the astrophysical journal supplement series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.546
H-Index - 277
eISSN - 1538-4365
pISSN - 0067-0049
DOI - 10.1086/516578
Subject(s) - redshift , astrophysics , physics , galaxy , astronomy , cosmos (plant) , telescope , redshift survey , population , emission spectrum , active galactic nucleus , spectral line , history , art history , demography , sociology
We present spectroscopic redshifts for the first 466 X-ray and radio-selectedAGN targets in the 2 deg^2 COSMOS field. Spectra were obtained with the IMACSinstrument on the Magellan (Baade) telescope, using the nod-and-shuffletechnique. We identify a variety of Type 1 and Type 2 AGN, as well as redgalaxies with no emission lines. Our redshift yield is 72% down to i_AB=24,although the yield is >90% for i_AB<22. We expect the completeness to increaseas the survey continues. When our survey is complete and additional redshiftsfrom the zCOSMOS project are included, we anticipate ~1100 AGN with redshiftsover the entire COSMOS field. Our redshift survey is consistent with anobscured AGN population that peaks at z~0.7, although further work is necessaryto disentangle the selection effects.
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