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Date and Time of the Query: 2019-08-24 T02:02:15 PDT
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For refcode 2001ApJ...557L..15C:
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2001ApJ...557L..15C Thermal Comptonization and Disk Thermal Reprocessing in NGC 3516 James Chiang and Omer Blaes Received 2001 June 7; accepted 2001 July 2; published 2001 July 17 ABSTRACT We present an application of the thermal Comptonization/disk reprocessing model recently proposed by Zdziarski, Lubinski, & Smith. We show that the absence of strong optical variations in the presence of strong concurrent X-ray variations, similar to those found by Hubble Space Telescope (HST)/Rossi X-Ray Timing Explorer (RXTE) monitoring observations of NGC 3516, can be explained by changing the geometry of the Comptonizing plasma rather than the accretion disk itself. The total X-ray luminosity of the Comptonizing plasma must decrease as its spatial extent increases. In contrast, the disk inner radius must be roughly fixed in order not to produce optical/ultraviolet color variations stronger than observed. By including emission due to internal viscous dissipation in the disk, we can roughly match the optical and X-ray flux levels and variability amplitudes seen from NGC 3516 during the HST/RXTE campaign. Subject headings: galaxies: active - galaxies: individual (NGC 3516) - galaxies: Seyfert - X-rays: galaxies
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