Obscured and unobscured active galactic nuclei in the Spitzer Space Telescope First Look Survey
Mark Lacy,Lisa J. Storrie-Lombardi,Anna Sajina,Phil Appleton,Lee Armus,Scott Chapman,P. I. Choi,Dario Fadda,Fan Fang,David T. Frayer,I. Heinrichsen,George Helou,Myungshin Im,Francine R. Marleau,Frank J. Masci,Dave Shupe,B. T. Soifer,Jason Surace,Harry I. Teplitz,Gillian Wilson,Lin Yan +20 more
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In this article, the authors use the Spitzer Space Telescope First Look Survey (FLS) to assess the fraction of active galactic nuclei (AGNs) with mid-infrared luminosities that are comparable to quasars and that are missed in optical quasar surveys because of dust obscuration.Abstract:
Selection of active galactic nuclei (AGNs) in the infrared facilitates the discovery of AGNs whose optical emission is extinguished by dust. In this paper, we use the Spitzer Space Telescope First Look Survey (FLS) to assess the fraction of AGNs with mid-infrared (MIR) luminosities that are comparable to quasars and that are missed in optical quasar surveys because of dust obscuration. We begin by using the Sloan Digital Sky Survey (SDSS) database to identify 54 quasars within the 4 deg^2 extragalactic FLS. These quasars occupy a distinct region in MIR color space by virtue of their strong, red continua. This has allowed us to define an MIR color criterion for selecting AGN candidates. About 2000 FLS objects have colors that are consistent with them being AGNs, but most are much fainter in the MIR than the SDSS quasars, which typically have 8 μm flux densities S_(8.0) ~ 1 mJy. We have investigated the properties of 43 objects with S_(8.0) ≥ 1 mJy that satisfy our AGN color selection. This sample should contain both unobscured quasars as well as AGNs that are absent from the SDSS survey because of extinction in the optical. After removing 16 known quasars, three probable normal quasars, and eight spurious or confused objects from the initial sample of 43, we are left with 16 objects that are likely to be obscured quasars or luminous Seyfert 2 galaxies. This suggests that the numbers of obscured and unobscured AGNs are similar in samples selected in the MIR at S_(8.0) ~ 1 mJy.read more
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Journal ArticleDOI
Spectral energy distributions and multiwavelength selection of type 1 quasars
Gordon T. Richards,Gordon T. Richards,Mark Lacy,Lisa J. Storrie-Lombardi,Patrick B. Hall,Sarah C. Gallagher,Dean C. Hines,Xiaohui Fan,Casey Papovich,Daniel E. Vanden Berk,George B. Trammell,Donald P. Schneider,Marianne Vestergaard,Donald G. York,Sebastian Jester,Sebastian Jester,Scott F. Anderson,Tamás Budavári,Alexander S. Szalay +18 more
TL;DR: In this article, the spectral energy distributions (SEDs) of 259 quasars with both Sloan Digital Sky Survey (SDS) and Spitzer photometry were analyzed.
Journal ArticleDOI
Mid-Infrared Selection of Active Galaxies
Daniel Stern,Peter R. Eisenhardt,Varoujan Gorjian,Christopher Kochanek,Nelson Caldwell,Daniel J. Eisenstein,Mark Brodwin,Michael J. I. Brown,R. Cool,Arjun Dey,Paul J. Green,Buell T. Jannuzi,Stephen S. Murray,Michael A. Pahre,Steven P. Willner +14 more
TL;DR: In this article, the Spitzer Space Telescope mid-infrared colors, derived from the IRAC Shallow Survey, of nearly 10,000 spectroscopically identified sources from the AGN and Galaxy Evolution Survey, were used to identify active galaxies.
Journal ArticleDOI
Spectral Energy Distributions of Hard X-Ray Selected Active Galactic Nuclei in the XMM-Newton Medium Deep Survey
Maria del Carmen Polletta,M. Tajer,Laura Maraschi,Ginevra Trinchieri,Carol J. Lonsdale,L. Chiappetti,Stefano Andreon,Marguerite Pierre,O. Le Fevre,G. Zamorani,D. Maccagni,O. Garcet,Jean Surdej,Alberto Franceschini,D. Alloin,David L. Shupe,Jason Surace,Fan Fang,Michael Rowan-Robinson,Harding E. Smith,L. Tresse +20 more
TL;DR: In this article, the authors presented the SEDs of a hard X-ray selected sample containing 136 sources with F 2-10 keV > 10^(-14) erg cm^(-2) s^(-1); 132 are AGNs.
Journal ArticleDOI
The Coevolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
Timothy M. Heckman,Philip Best +1 more
TL;DR: In this paper, the authors present a picture in which the population of active galactic nuclei (AGNs) can be divided into two distinct populations: radiative-mode AGNs are associated with black holes that produce radiant energy powered by accretion at rates in excess of ∼ 1% of the Eddington limit.
Journal ArticleDOI
The Spitzer-WISE Survey of the Ecliptic Poles
Thomas H. Jarrett,Martin Cohen,Frank J. Masci,Edward L. Wright,Daniel Stern,Dominic J. Benford,Andrew Blain,Sean Carey,Roc M. Cutri,Peter Eisenhardt,C. Lonsdale,A. K. Mainzer,K. A. Marsh,D. Padgett,Sara Petty,Michael E. Ressler,Mike Skrutskie,S. A. Stanford,Jason Surace,Chao-Wei Tsai,S. Wheelock,D. L. Yan +21 more
TL;DR: In this paper, the authors carried out a survey of the north and south ecliptic poles, EP-N and EP-S, respectively, with the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer (WISE).
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The Spitzer Space Telescope mission
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TL;DR: The Spitzer Space Telescope, NASA's great Observatory for infrared astronomy, was launched 2003 August 25 and is returning excellent scientific data from its Earth-trailing solar orbit as mentioned in this paper.
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