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18 February 2025
 
  » arxiv » astro-ph/0107036

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Thermal Comptonization and Disk Thermal Reprocessing in NGC 3516
James Chiang ; Omer Blaes ;
Date 3 Jul 2001
Subject astro-ph
AffiliationUMBC/GSFC), Omer Blaes (UCSB
AbstractWe present an application of the thermal Comptonization/disk reprocessing model recently proposed by Zdziarski, Lubi’nski, & Smith. We show that the absence of strong optical variations in the presence of strong concurrent X-ray variations, similar to those found by HST/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.
Source arXiv, astro-ph/0107036
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