Magellan Spectroscopy of AGN Candidates in the COSMOS Field

Abstract

We present spectroscopic redshifts for the first 466 X-ray and radio-selected AGN targets in the 2 deg^2 COSMOS field. Spectra were obtained with the IMACS instrument on the Magellan (Baade) telescope, using the nod-and-shuffle technique. We identify a variety of Type 1 and Type 2 AGN, as well as red galaxies 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 increase as the survey continues. When our survey is complete and additional redshifts from the zCOSMOS project are included, we anticipate ~1100 AGN with redshifts over the entire COSMOS field. Our redshift survey is consistent with an obscured AGN population that peaks at z~0.7, although further work is necessary to disentangle the selection effects.

arXiv comment19 pages, 14 figures. Accepted to ApJS special COSMOS issue. The full electronic version of Table 2 can be found at http://shaihulud.as.arizona.edu/~jtrump/tab2.txt

References in corpus (23)

• The Sloan Digital Sky Survey: Technical Summary
• The Cosmic Evolution Survey (COSMOS) -- Overview
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Spectroscopic Target Selection for the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• Luminosity-dependent evolution of soft X-ray selected AGN: New Chandra and XMM-Newton surveys
• The HELLAS2XMM survey. VII. The hard X-ray luminosity function of AGN up to z=4: more absorbed AGN at low luminosities and high redshifts
• Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
• The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
• The VLA-COSMOS Survey: II. Source Catalog of the Large Project
• An Integrated Spectrophotometric Survey of Nearby Star-Forming Galaxies
• A sample of radio-loud AGN in the Sloan Digital Sky Survey
• The Gemini Deep Deep Survey: I. Introduction to the Survey, Catalogs and Composite Spectra
• Radio sources in the 2dF Galaxy Redshift Survey - II. Local radio luminosity functions for AGN and star-forming galaxies at 1.4 GHz
• The HELLAS2XMM survey: IV. Optical identifications and the evolution of the accretion luminosity in the Universe
• The XMM-Newton wide-field survey in the COSMOS field: III. optical identification and multiwavelength properties of a large sample of X-ray selected sources
• The Changing AGN Population
• Microslit Nod-shuffle Spectroscopy - a technique for achieving very high densities of spectra
• The effects of environment on morphological evolution between 0<z<1.2 in the COSMOS Survey
• The XMM-Newton wide-field survey in the COSMOS field. IV: X-ray spectral properties of Active Galactic Nuclei
• Hard X-ray emitting Active Galactic Nuclei selected by the Chandra Multi-wavelength Project
• Photometric redshifts from reconstructed QSO templates
• The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program. III. Optical Spectroscopy

Cited by in corpus (101)

• Identifying Luminous AGN in Deep Surveys: Revised IRAC Selection Criteria
• The star formation history of mass-selected galaxies in the COSMOS field
• COSMOS : Hubble Space Telescope Observations
• The Chandra COSMOS Survey, I: Overview and Point Source Catalog
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release
• Photometric redshift and classification for the XMM-COSMOS sources
• A 158 Micron [CII] Line Survey of Galaxies at z ~ 1 to 2: An Indicator of Star Formation in the Early Universe
• Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey: II. ~1,000,000 Quasars from Data Release Six
• The Chandra COSMOS Legacy survey: optical/IR identifications
• The incidence of obscuration in active galactic nuclei
• The VLA-COSMOS Survey: II. Source Catalog of the Large Project
• The XMM-Newton wide-field survey in the COSMOS field: VI. Statistical properties of clusters of galaxies
• The XMM-Newton Wide-Field Survey in the COSMOS field (XMM-COSMOS): demography and multiwavelength properties of obscured and unobscured luminous AGN
• Dissecting Photometric redshift for Active Galactic Nuclei using XMM- and Chandra-COSMOS samples
• Accreting SMBHs in the COSMOS field and the connection to their host galaxies
• UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS
• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• Ongoing and co-evolving star formation in zCOSMOS galaxies hosting Active Galactic Nuclei
• The VLA-COSMOS Survey. IV. Deep Data and Joint Catalog
• AGN Host Galaxy Morphologies in COSMOS
• Chasing highly obscured QSOs in the COSMOS field
• Mapping the Galaxy Color-Redshift Relation: Optimal Photometric Redshift Calibration Strategies for Cosmology Surveys
• "Super-deblended" Dust Emission in Galaxies: II. Far-IR to (sub)millimeter photometry and high redshift galaxy candidates in the full COSMOS field
• The Demographics of Broad Line Quasars in the Mass-Luminosity Plane II. Black Hole Mass and Eddington Ratio Functions
• Constraints on Black Hole Growth, Quasar Lifetimes, and Eddington Ratio Distributions from the SDSS Broad Line Quasar Black Hole Mass Function
• The XMM-Newton wide-field survey in the COSMOS field: III. optical identification and multiwavelength properties of a large sample of X-ray selected sources
• Accretion Rate and the Physical Nature of Unobscured Active Galaxies
• A Multiwavelength Study of a Sample of 70 micron Selected Galaxies in the COSMOS Field II: The Role of Mergers in Galaxy Evolution
• Cosmic evolution of radio selected active galactic nuclei in the COSMOS field
• A new method to separate star forming from AGN galaxies at intermediate redshift: The submillijansky radio population in the VLA-COSMOS survey
• First catalog of strong lens candidates in the COSMOS field
• The XMM-Newton Wide field survey in the COSMOS field: redshift evolution of AGN bias and subdominant role of mergers in triggering moderate luminosity AGN at redshift up to 2.2
• Measuring the Fraction of Obscured Quasars by the Infrared Luminosity of Unobscured Quasars
• The COSMOS AGN Spectroscopic Survey I: XMM Counterparts
• The Chandra COSMOS-Legacy survey: Source X-ray spectral properties
• Millimeter imaging of submillimeter galaxies in the COSMOS field: Redshift distribution
• The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1
• The VLA-COSMOS Survey: III. Further Catalog Analysis and the Radio Source Counts
• The Mean Star-Forming Properties of QSO Host Galaxies
• A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?
• Pan-STARRS1 variability of XMM-COSMOS AGN. II. Physical correlations and power spectrum analysis
• The VLA-COSMOS Perspective on the IR-Radio Relation. I. New Constraints on Selection Biases and the Non-Evolution of the IR/Radio Properties of Star Forming and AGN Galaxies at Intermediate and High Redshift
• The XMM-Newton wide-field survey in the COSMOS field. IV: X-ray spectral properties of Active Galactic Nuclei
• The Environments of Active Galactic Nuclei within the zCOSMOS Density Field
• The spatial clustering of X-ray selected AGN in the XMM-COSMOS field
• High redshift quasars in the COSMOS survey: the space density of z>3 X-ray selected QSOs
• Observational Constraints on the Dependence of Radio-Quiet Quasar X-ray Emission on Black Hole Mass and Accretion Rate
• A Multiwavelength Study of a Sample of 70 micron Selected Galaxies in the COSMOS Field I: Spectral Energy Distributions and Luminosities
• The Spitzer mid-infrared AGN survey. I - optical and near-infrared spectroscopy of candidate obscured and normal AGN selected in the mid-infrared
• The Population of High Redshift AGNs in the Chandra COSMOS survey
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• Spectral Energy Distributions of Type 1 AGN in the COSMOS Survey I - The XMM-COSMOS Sample
• The Angular Clustering of WISE-Selected AGN: Different Haloes for Obscured and Unobscured AGN
• Eight-Dimensional Mid-Infrared/Optical Bayesian Quasar Selection
• The Chandra-COSMOS survey IV: X-ray spectra of the bright sample
• AGN X-ray variability in the XMM-COSMOS survey
• The evolution of the star formation activity per halo mass up to redshift ~ 1.6 as seen by Herschel
• Physical properties of z>4 submillimeter galaxies in the COSMOS field
• The GALEX Time Domain Survey I. Selection and Classification of Over a Thousand UV Variable Sources
• SINFONI spectra of heavily obscured AGNs in COSMOS: evidence of outflows in a MIR/O target at z$\sim 2.5$
• The faint radio sky: VLBA observations of the COSMOS field
• A wide angle tail radio galaxy in the COSMOS field: evidence for cluster formation
• Properties of dusty tori in active galactic nuclei - II. Type 2 AGN
• The XMM-Newton wide-field survey in the COSMOS field: V. Angular Clustering of the X-ray Point Sources
• Spectroscopic observations of PHz G237.01+42.50: A galaxy protocluster at z=2.16 in the Cosmos field
• Properties of the molecular gas in a starbursting QSO at z=1.83 in the COSMOS field
• The Host Galaxies of X-ray Quasars Are Not Strong Star Formers
• The Chandra COSMOS Legacy survey: the z>3 sample
• Constraints on the Nature of CID-42: Recoil Kick or Supermassive Black Hole Pair?
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies III. Environments
• Cluster candidates around low power radio-galaxies at z~1-2 in COSMOS
• A near-infrared excess in the continuum of high-redshift galaxies: a tracer of star formation and circumstellar disks?
• A comparative analysis of virial black-hole mass estimates of moderate-luminosity active galactic nuclei using Subaru/FMOS
• The lack of star formation gradients in galaxy groups up to z~1.6
• Pan-STARRS1 variability of XMM-COSMOS AGN. I. Impact on photometric redshifts
• The VLA-COSMOS Survey: V. 324 MHz continuum observations
• The role of massive halos in the Star Formation History of the Universe
• Stellar X-ray sources in the Chandra COSMOS survey
• The QUEST-La Silla AGN Variability Survey
• Stellar Mass Growth of Brightest Cluster Galaxy Progenitors in COSMOS Since z ~ 3
• The evolution of galaxy star formation activity in massive halos
• The Chandra COSMOS Legacy Survey: Clustering of X-ray selected AGN at 2.9<z<5.5 using photometric redshift Probability Distribution Functions
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• Molecular gas in radio galaxies in dense Mpc-scale environments at $z=0.4-2.6$
• Spectral Energy Distributions of low-luminosity radio galaxies at z~1-3: a high-z view of the host/AGN connection
• The evolution of star formation activity in galaxy groups
• Morphology & Environment's Role on the Star Formation Rate -- Stellar Mass Relation in COSMOS from 0 < z < 3.5
• X-ray properties of radio-selected star forming galaxies in the Chandra-COSMOS survey
• Morphological Evolution of the Hosts of Far-Infrared/Submillimeter Galaxies
• MAGIC: Muse gAlaxy Groups In Cosmos -- A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr
• DESI Complete Calibration of the Color-Redshift Relation (DC3R2): Results from early DESI data
• A slitless spectroscopic survey for quasars near quasars
• Obscured AGN enhancement in galaxy pairs at cosmic noon: evidence from a probabilistic treatment of photometric redshifts
• A new method to search for high redshift clusters using photometric redshifts
• Optical Selection of Faint AGN in the COSMOS Field
• The X-ray properties of high-z FRI candidates in the COSMOS field
• Radio stacking reveals evidence for star formation in the host galaxies of X-ray selected active galactic nuclei at z<1
• Role of AGNs in the Luminous Infrared Galaxy phase since z ~ 3
• Exploring the X-ray-radio connection for AGN via measurements of the multi-dimensional luminosity function
• Where's Swimmy?: Mining unique color features buried in galaxies by deep anomaly detection using Subaru Hyper Suprime-Cam data