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Changing look: from Compton-thick to Compton-thin, or the re-birth of fossil AGN | G. Matt
; M. Guainazzi
; R. Maiolino
; | Date: |
17 Feb 2003 | Journal: | Mon.Not.Roy.Astron.Soc. 342 (2003) 422 | Subject: | astro-ph | Abstract: | We discuss the properties of a small sample of Seyfert 2 galaxies whose X-ray spectrum changed appearance on time scales of years, becoming reflection-dominated from Compton-thin, or viceversa. A reflection--dominated spectrum is usually taken as evidence of Compton-thick absorption, but we instead argue that such a spectrum is due to a temporary switching--off of the nuclear radiation. The observations discussed here may help explaining mismatches between optical and X-ray classifications, and provide new strong and direct evidence of the presence of more than one cold circumnuclear region in Seyfert 2 galaxies. | Source: | arXiv, astro-ph/0302328 | Services: | Forum | Review | PDF | Favorites |
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