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• W2093893722 abstract "The Seyfert 2 Galaxy NGC 7172 was observed twice by BeppoSAX narrow eld instruments approx- imately one year apart. As found in previous observations, the source is variable on short time scales (hours) by a factor of30%, conrming the presence of a type 1 nucleus at the center. A strong flux variability (by a factor of 2) on a longer time scale was observed between the two observations. Indeed, in November 1997, the lowest flux ever recorded was detected by BeppoSAX. The broad band spectra obtained with the BeppoSAX narrow eld instruments show marginal evidence of a reflection component. This structure could explain the very flat spectra previously observed in the 2{10 keV band. An FeK line was also detected in both observations. The line intensity appears to remain almost constant between the two observations even if the associated large errors cannot exclude some variability. In order to understand the problem of the origin of the line, data from previous observations, performed with other satellites, were also used. The scenario favored is one where the line is produced at a distance of approximatively 8 light years from the continuum source region, rather than having its origin in the accretion disk. In the framework of the standard unied models for AGN, this suggests that its origin is located in the molecular torus." @default.
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• W2093893722 date "2001-04-01" @default.
• W2093893722 modified "2023-09-27" @default.
• W2093893722 title "On the origin of the FeKαline in the Seyfert 2 galaxy NGC 7172" @default.
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• W2093893722 doi "https://doi.org/10.1051/0004-6361:20010132" @default.
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