NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-26 T08:02:17 PDT
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For refcode 2000MNRAS.318L..11W:
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Copyright by Royal Astronomical Society. 2000MNRAS.318L..11W Hot dust in two hard Chandra X-ray sources R. J. Wilman, A. C. Fabian and P. Gandhi Accepted 2000 August 9. Received 2000 August 2; in original form 2000 June 12 ABSTRACT The two brightest hard X-ray sources discovered serendipitously by Chandra in the field of the lensing cluster A2390 are found to have ISOCAM counterparts at 6.7 and 15 microns. We use this fact, together with their non-detection by SCUBA at 850 microns, as the basis for DUSTY radiative transfer modelling of their infrared spectral energy distributions. For the best-fitting models, we find that the dust that reprocesses the optical- ultraviolet light in these Compton-thin active galactic nuclei (AGN) is heated to near its sublimation temperature (above 1000 K), with an inner radius within a parsec of the nucleus. Some warm-dust models with inner temperatures of 200 K are also formally acceptable. These findings strongly support the obscured AGN hypothesis for the new hard X-ray Chandra sources, which lack both strong emission lines and 850-mm SCUBA detections. Keywords: galaxies: active - quasars: general - galaxies: Seyfert - infrared: galaxies - X-rays: general
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