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Date and Time of the Query: 2019-08-23 T05:28:27 PDT
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For refcode 2000ApJ...544..283C:
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Copyright by American Astronomical Society. Reproduced by permission
2000ApJ...544..283C The Complex X-Ray Absorbers of NGC 3516 Observed by BEPPOSAX E. Costantini, F. Nicastro, A. Fruscione, S. Mathur, A. Comastri, M. Elvis, F. Fiore, C. Salvini, G. M. Stirpe, C. Vignali, B. Wilkes, P. T. O'Brien, and M. R. Goad Received 2000 March 17; accepted 2000 July 13 ABSTRACT In this paper we present the analysis of two broadband (0.1-150 keV) BeppoSAX observations of the Seyfert 1 galaxy NGC 3516. The two observations were taken 4 months apart, on 1996 November 8 and 1997 March 12. We report a dramatic change in the degree of obscuration of the central source between the two observations and propose, as possible explanations, transient absorption by either a stationary-state cloud of cold gas crossing the line of sight or a varying-state, initially neutral and dense amount of expanding gas with decreasing density and therefore decreasing opacity. We also report the detection of a second highly ionized absorber/emitter, which causes deep Fe XVII-XXII K edges at ~7.8 keV to appear in both of the BeppoSAX spectra of NGC 3516 and possibly produces the soft X-ray continuum emission in the 1 keV blend of Fe L recombination lines detected during the epoch of heavy nuclear obscuration. Subject headings: galaxies: individual (NGC 3516)-galaxies: Seyfert -X- rays: galaxies
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