Active Galactic Nuclei in the CNOC2 Field Galaxy Redshift Survey

Abstract

We present a sample of 47 confirmed and 14 candidate Active Galactic Nuclei (AGN) discovered in the Canadian Network for Observational Cosmology field galaxy redshift survey (CNOC2). The sample consists of 38 objects identified from broad emission lines, 8 from narrow [NeV] emission, and 15 candidates from FeII or MgII absorption lines, one of which has been confirmed as a broad-line AGN via infrared spectroscopy. Redshifts of these AGN range from z=0.27 to z=4.67, and the average absolute magnitude is M_B=-22.25. No color selection criteria were involved in selecting this spectroscopically discovered sample. The sample is also unbiased against objects with luminous host galaxies since the spectroscopy preferentially targeted extended objects. Simple color-color diagram selection criteria can recover 81+-6% of the CNOC2 AGN, but several of the most unusual objects would be missing from such a color-selected sample. In the subsample with broad emission lines, the average equivalent widths for MgII and CIII] agree with the predictions of previous studies of the Baldwin effect. However, the average equivalent widths for CIV and Ly-alpha are smaller than predicted by previous studies of the Baldwin effect at lower redshift. This may imply that the slopes of the CIV and Ly-alpha Baldwin effects evolve with redshift, steepening with cosmic time. The broad emission line AGN also show a higher incidence of associated MgII and CIV absorption than in most previous surveys. This may arise from strong absorption being anti-correlated with optical luminosity or becoming less frequent with cosmic time, or possibly because our selection method is not biased against objects with resolved spatial structure or reddened by dust associated with the absorbing gas. (Abridged)

50 pages, 16 figures, AJ in press

References in corpus (33)

• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• A New Method For Galaxy Cluster Detection I: The Algorithm
• The Ultraviolet Spectrum of MS 1512-cB58: An Insight into Lyman Break Galaxies
• The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Later
• Caltech Faint Galaxy Redshift Survey X: A Redshift Survey in the Region of the Hubble Deep Field North
• Properties of Radio-Selected Broad Absorption-Line Quasars from the FIRST Survey
• New Techniques for Relating Dynamically Close Galaxy Pairs to Merger and Accretion Rates : Application to the SSRS2 Redshift Survey
• The CNOC2 Field Galaxy Luminosity Function I: A Description of Luminosity Function Evolution
• The UV Properties of the Narrow Line Quasar I Zwicky 1
• High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data
• Polarization of Broad Absorption Line QSOs I. A Spectropolarimetric Atlas
• The FIRST Radio-Loud Broad Absorption Line QSO and Evidence for a Hidden Population of Quasars
• The Discovery of a High-redshift Quasar without Emission Lines from Sloan Digital Sky Survey Commissioning Data
• Constraints on the Early Formation of Field Elliptical Galaxies
• A Proto-Galaxy Candidate at z=2.7 Discovered by Its Young Stellar Population
• The CNOC2 Field Galaxy Redshift Survey I: The Survey and the Catalog for the Patch CNOC 0223+00
• A Study of Nine High-Redshift Clusters of Galaxies: II. Photometry, Spectra, and Ages of Clusters 0023+0423 and 1604+4304
• The Canada-France Redshift Survey XII: Nature of emission-line field galaxy population up to z = 0.3
• Red and Blue Shifted Broad Lines in Luminous Quasars
• Discovery of a Color-Selected Quasar at z=5.50
• HAWAII 167 and Q0059-2735: Heavily Dust-Enshrouded Young QSOs
• The Molonglo Reference Catalog 1-Jy radio source survey IV. Optical spectroscopy of a complete quasar sample
• The Relationship Between the High Energy Continuum and Emission Lines in QSOs: A Low-Redshift Sample
• Caltech Faint Galaxy Redshift Survey VII: Data Analysis Techniques and Redshifts in the Field J0053+1234
• A Deep Multicolor Survey II. Initial Spectroscopy and Comparison With Expected Quasar Number Counts
• On the Baldwin Effect in Active Galactic Nuclei: I. The Continuum-Spectrum - Mass Relationship
• A Deep Multicolor Survey. IV. The Electronic Stellar Catalog
• The Optical/Near-IR Colors of Broad Absorption Line Quasars, Including the Candidate Radio-Loud BAL Quasar 1556+3517
• A Deep Multicolor Survey I. Imaging Observations and Catalog of Stellar Objects
• A Deep Multicolor Survey. III. Additional Spectroscopy and Implications for the Number Counts of Faint Quasars
• The Canada-France Redshift Survey X: The Quasar Sample
• Compact Nuclei in Galaxies at Moderate Redshift: I. Imaging and Spectroscopy
• A Morphological and Multicolor Survey for Faint QSOs in the Groth-Westphal Strip

Cited by in corpus (10)

• Nuclear Activity in Nearby Galaxies
• Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
• The Fall of AGN and the Rise of Star-Forming Galaxies: A Close Look at the Chandra Deep Field X-ray Number Counts
• Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
• XMM-Newton observations of Extremely Red Objects and the link with luminous, X-ray obscured Quasars
• A V-Band Survey for Variable Galactic Nuclei in the Hubble Deep Field
• AEGIS: A Multi-wavelength Study of Spitzer Power-law Galaxies
• The DEEP Groth Strip Survey VI. Spectroscopic, Variability, and X-ray Detection of AGN
• Early Science Result from the Japanese Virtual Observatory: AGN and Galaxy Clustering at z = 0.3 to 3.0
• Hard X-ray observations of Extremely Red Objects