Abstract A Ginga X-ray observation has revealed a clear absorption like feature at the energy of several to ten keV and the presence of a hard X-ray bump in the spectra of Seyfert 1 galaxy, IC4329A. This feature is not reproduced by a conventional model of a power law function with uniform absorber and an emission line. The reflection model, which has the composite X-ray spectrum consisting of a direct component and a reprocessed one by cold thick matter can reproduce such a spectrum. Detection of the iron fluorescence line at 6.4 keV with equivalent width of 100 eV supports this model. The spectrum is also well fitted by a partial covering (or leaky absorber) model. Either model indicates that highly dense matter (NH > 1024 H cm−2) is necessary around the central X-ray source. This high column density is definitely greater than a reasonable one in the broad line region (BLR) of active galactic nuclei, and this would be located in nearer region from the nucleus than the BLR. Thus this new result could have a great impact in understanding a structure surrounding a compact object in the core of active galactic nuclei/1,2,3/.
A spectral signature of thick matter in the X-ray spectrum from the Seyfert 1 galaxy, IC4329A
Advances in Space Research ; 11 , 8 ; 41-43
1991-01-01
3 pages
Article (Journal)
Electronic Resource
English
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