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dc.contributor.authorLacy, M.
dc.contributor.authorRidgway, S.
dc.contributor.authorGates, E.
dc.contributor.authorNielsen, D.
dc.contributor.authorPetric, A.
dc.contributor.authorSajina, A.
dc.contributor.authorUrrutia, T.
dc.contributor.authorCox Drews, S.
dc.contributor.authorHarrison, C.
dc.contributor.authorSeymour, Nick
dc.contributor.authorStorrie-Lombardi, L.
dc.date.accessioned2017-01-30T11:13:43Z
dc.date.available2017-01-30T11:13:43Z
dc.date.created2016-01-18T20:00:49Z
dc.date.issued2013
dc.identifier.citationLacy, M. and Ridgway, S. and Gates, E. and Nielsen, D. and Petric, A. and Sajina, A. and Urrutia, T. et al. 2013. The Spitzer mid-infrared active galactic nucleus survey. I. Optical and near-infrared spectroscopy of obscured candidates and normal active galactic nuclei selected in the mid-infrared. Astrophysical Journal, Supplement Series. 208 (2).
dc.identifier.urihttp://hdl.handle.net/20.500.11937/9597
dc.identifier.doi10.1088/0067-0049/208/2/24
dc.description.abstract

We present the results of a program of optical and near-infrared spectroscopic follow-up of candidate active galactic nuclei (AGNs) selected in the mid-infrared. This survey selects both normal and obscured AGNs closely matched in luminosity across a wide range, from Seyfert galaxies with bolometric luminosities L bol ~ 1010 L ☉ to highly luminous quasars (L bol ~ 1014 L ☉), all with redshifts ranging from 0 to 4.3. Samples of candidate AGNs were selected with mid-infrared color cuts at several different 24 μm flux density limits to ensure a range of luminosities at a given redshift. The survey consists of 786 candidate AGNs and quasars, of which 672 have spectroscopic redshifts and classifications. Of these, 137 (20%) are type 1 AGNs with blue continua, 294 (44%) are type 2 objects with extinctions AV ~>5 toward their AGNs, 96 (14%) are AGNs with lower extinctions (AV ~ 1), and 145 (22%) have redshifts, but no clear signs of AGN activity in their spectra. Of the survey objects 50% have L bol > 1012 L ☉, in the quasar regime. We present composite spectra for type 2 quasars and objects with no signs of AGN activity in their spectra. We also discuss the mid-infrared—emission-line luminosity correlation and present the results of cross correlations with serendipitous X-ray and radio sources. The results show that: (1) obscured objects dominate the overall AGN population, (2) mid-infrared selected AGN candidates exist which lack AGN signatures in their optical spectra but have AGN-like X-ray or radio counterparts, and (3) X-ray and optical classifications of obscured and unobscured AGNs often differ.

dc.titleThe Spitzer mid-infrared active galactic nucleus survey. I. Optical and near-infrared spectroscopy of obscured candidates and normal active galactic nuclei selected in the mid-infrared
dc.typeJournal Article
dcterms.source.volume208
dcterms.source.number2
dcterms.source.issn0067-0049
dcterms.source.titleAstrophysical Journal, Supplement Series
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access via publisher


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