NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T21:00:46 PDT
Help | Comment | NED Home

For refcode 1997ApJ...486..147G:
Retrieve 30 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1997ApJ...486..147G Thick Tori around Active Galactic Nuclei: The Case for Extended Tori and Consequences for Their X-Ray and Infrared Emission GIAN LUIGI GRANATO Osservatorio Astronomico di Padova, Padova, Italy LUIGI DANESE International School for Advanced Studies, SISSA, Trieste, Italy AND ALBERTO FRANCESCHINI Dipartimento di Astronomia di Padova, Padova, Italy Received 1996 December 5; accepted 1997 April 2 ABSTRACT Two families of models of dusty tori in active galactic nuclei (AGNs; moderately thick and extended versus very thick and compact) are tested against available observations. The confrontation suggests that the former class better explains the infrared (IR) broadband spectra of both broad- and narrow-line AGNs, the anisotropy of the emission deduced by comparing IR properties of Seyfert 1 and 2 nuclei, and the results of IR spectroscopy and those of high spatial resolution observations. There is, however, clear evidence for a broad distribution of optical depths. We also examine the relationship between IR and X-ray emission. The data support a view in which the matter responsible for the X-ray absorption is mostly dust free, lying inside the dust sublimation radius. The consequences of these results for the hard X-ray background as well as IR counts and background are discussed. Subject headings: dust, extinction-galaxies: active-galaxies: nuclei- galaxies: Seyfert-infrared: galaxies-radiative transfer
Retrieve 30 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home