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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

Lacy, M ; Ridgway, S E ; Gates, E L ; Nielsen, D M ; Petric, A O ; SAJINA, A ; Urrutia, T ; Drews, S Cox ; Harrison, C ; Seymour, N ; Storrie-Lombardi, L J

The Astrophysical journal. Supplement series, 2013-10, Vol.208 (2), p.1-18 [Periódico revisado por pares]

United States

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  • Título:
    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
  • Autor: Lacy, M ; Ridgway, S E ; Gates, E L ; Nielsen, D M ; Petric, A O ; SAJINA, A ; Urrutia, T ; Drews, S Cox ; Harrison, C ; Seymour, N ; Storrie-Lombardi, L J
  • Assuntos: ABSORPTION SPECTROSCOPY ; Active galactic nuclei ; ASTRONOMY ; ASTROPHYSICS ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; BOLOMETERS ; Classifications ; COLOR ; CORRELATIONS ; Extinction ; FLUX DENSITY ; GALAXY NUCLEI ; INFRARED SPECTRA ; LUMINOSITY ; QUASARS ; RED SHIFT ; SEYFERT GALAXIES ; Spectra ; Spectroscopy ; X RADIATION ; X-rays
  • É parte de: The Astrophysical journal. Supplement series, 2013-10, Vol.208 (2), p.1-18
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 sub(bol) ~ 10 super(10) L sub([middot in circle]) to highly luminous quasars (L sub(bol) ~ 10 super(14) L sub([middot in circle])), all with redshifts ranging from 0 to 4.3. Samples of candidate AGNs were selected with mid-infrared color cuts at several different 24 mu m 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 A sub(v) [> ~] 5 toward their AGNs, 96 (14%) are AGNs with lower extinctions (A sub(v) ~ 1), and 145 (22%) have redshifts, but no clear signs of AGN activity in their spectra. Of the survey objects 50% have L sub(bol) > 10 super(12) L sub([middot in circle]), 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.
  • Editor: United States
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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