A diagnostic diagram for Seyfert 2 Galaxies (Bassani+, 1999)

Details A diagnostic diagram for Seyfert 2 Galaxies (Bassani+, 1999) A diagnostic diagram for Seyfert 2 Galaxies (Bassani+, 1999)

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..21210473b&link_type=abstract

VizieR On-line Data Catalog: J/ApJS/121/473. Originally published in: 1999ApJS..121..473B

Computer Science

1

Galaxies: Seyfert, X-Ray Sources

Scientific paper

We present and discuss a three-dimensional diagnostic diagram for Seyfert 2 galaxies obtained using X-ray and [O III] data on a large sample of objects (reported in the Appendix). The diagram shows the Kα iron line equivalent width as a function of both the column density derived from the photoelectric cutoff and the 2-10 keV flux normalized to the [O III] optical-line flux (the latter corrected for extinction and assumed to be a true indicator of the source intrinsic luminosity). We find that the hard X-ray properties of type 2 objects depend on a single parameter, the absorbing column density along the line of sight, in accordance with the unified model. The diagram can be used to identify Compton-thick sources and to isolate and study peculiar objects. From this analysis we have obtained a column density distribution of Seyfert 2 galaxies that is thought to be a good approximation of the real distribution. A large population of heavily absorbed objects is discovered, including many Compton-thick candidates. Our results indicate that the mean log NHcm-2 in type 2 Seyfert galaxies is 23.5 and that as many as 23%-30% of sources have NH=>1024cm-2. (3 data files).

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