Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends

Pier, Edward A.; Krolik, Julian H.

doi:10.1086/172042

Cited by 457 publications

(508 citation statements)

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“…The dusty torus absorbs the AGN radiation and, then, reprocesses it to emerge in the infrared (IR), peaking in the mid-IR (MIR; ∼5-30 µm), according to torus models (e.g. Pier & Krolik 1992;Efstathiou & Rowan-Robinson 1995;Schartmann et al 2005;Hönig et al 2006;Nenkova et al 2008a,b;Stalevski et al 2012;Siebenmorgen, Heymann, & Efstathiou 2015).…”

Section: Introductionmentioning

confidence: 99%

The nuclear and extended mid-infrared emission of Seyfert galaxies

García-Bernete¹,

Almeida²,

Acosta–Pulido³

et al. 2016

Mon. Not. R. Astron. Soc.

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We present subarcsecond resolution mid-infrared (MIR) images obtained with 8-10 m-class ground-based telescopes of a complete volume-limited (D L <40 Mpc) sample of 24 Seyfert galaxies selected from the Swift/BAT nine month catalog. We use those MIR images to study the nuclear and circumnuclear emission of the galaxies. Using different methods to classify the MIR morphologies on scales of ∼400 pc, we find that the majority of the galaxies (75-83%) are extended or possibly extended and 17-25% are point-like. This extended emission is compact and it has low surface brightness compared with the nuclear emission, and it represents, on average, ∼30% of the total MIR emission of the galaxies in the sample. We find that the galaxies whose circumnuclear MIR emission is dominated by star formation show more extended emission (650±700 pc) than AGN-dominated systems (300±100 pc). In general, the galaxies with point-like MIR morphologies are face-on or moderately inclined (b/a∼0.4-1.0), and we do not find significant differences between the morphologies of Sy1 and Sy2. We used the nuclear and circumnuclear fluxes to investigate their correlation with different AGN and SF activity indicators. We find that the nuclear MIR emission (the inner ∼70 pc) is strongly correlated with the X-ray emission (the harder the X-rays the better the correlation) and with the [O IV] λ25.89 µm emission line, indicating that it is AGN-dominated. We find the same results, although with more scatter, for the circumnuclear emission, which indicates that the AGN dominates the MIR emission in the inner ∼400 pc of the galaxies, with some contribution from star formation.

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Section: Introductionmentioning

confidence: 99%

The nuclear and extended mid-infrared emission of Seyfert galaxies

García-Bernete¹,

Almeida²,

Acosta–Pulido³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…The ISO data also allow us to investigate the mid-IR "AGN" bump in quasars covering a range of redshift and luminosity. We plan to use these data to test and constrain current models of emission from a molecular torus (Pier & Krolik 1992, Efstathiou & Rowan-Robinson 1995.…”

Section: Discussionmentioning

confidence: 99%

ISO Observations of Quasars and Quasar Hosts

Wilkes

1997

ESO Astrophysics Symposia

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Abstract. The Infrared Space Observatory (ISO), launched in November 1995, allows us to measure the far-infrared (far-IR) emission of quasars in greater detail and over a wider energy range than previously possible. In this paper, preliminary results in a study of the 5-200 µm continuum of quasars and active galaxies are presented. Comparison of the spectral energy distributions show that, if the far-IR emission from quasars is thermal emission from galaxian dust, the host galaxies of quasars must contain dust in quantities comparable to IR luminous galaxies rather than normal spiral galaxies. In the near-IR, the ISO data confirm an excess due to a warm 'AGN-related' dust component, possibly from the putative molecular torus. We report detection of the high-redshift quasar, 1202-0727, in the near-IR indicating that it is unusually IR-bright compared with low-redshift quasars.

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“…The far-infrared emission from Herschel provides a clean tracer of host galaxy star-formation (Pier & Krolik 1992), making these data of particular importance to study the host galaxies of AGNs (Pier & Krolik 1992;Efstathiou & Rowan-Robinson 1995;Lutz et al 2004;Fritz et al 2006;Schweitzer et al 2006;Netzer et al 2007;Schartmann et al 2008;Shao et al 2010;Mullaney et al 2011;Rosario et al 2012;Magdis et al 2013;Delvecchio et al 2014). Indeed, the XMM-Newton AO13 survey was specifically designed to overlap existing Herschel coverage, since similar far-infrared data will not be available in the foreseeable future.…”

Section: Herschelmentioning

confidence: 99%

THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

LaMassa

Urry²,

Cappelluti

et al. 2016

ApJ

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We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg 2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with XMM-Newton (>5σ) and Chandra (>4.5σ). This catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7×10 −16 erg s −1 cm −2 , 4.7×10 −15 erg s −1 cm −2 , and 2.1×10 −15 erg s −1 cm −2 in the soft (0.5-2 keV), hard (2-10 keV), and full bands (0.5-10 keV), respectively, with approximate half-area survey flux limits of 5.4×10 −15 erg s −1 cm −2 , 2.9×10 −14 erg s −1 cm −2 , and 1.7×10 −14 erg s −1 cm −2 . We matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey, ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ∼30% optical spectroscopic completeness, we are beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high-redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live.

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Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends

Cited by 457 publications

References 0 publications

The nuclear and extended mid-infrared emission of Seyfert galaxies

The nuclear and extended mid-infrared emission of Seyfert galaxies

ISO Observations of Quasars and Quasar Hosts

THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

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Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends

Cited by 457 publications

References 0 publications

The nuclear and extended mid-infrared emission of Seyfert galaxies

The nuclear and extended mid-infrared emission of Seyfert galaxies

ISO Observations of Quasars and Quasar Hosts

THE 31 DEG2 RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

Contact Info

Product

Resources

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THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG