X-ray spectral signatures of accreting black holes

Details X-ray spectral signatures of accreting black holes X-ray spectral signatures of accreting black holes

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133l...9w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 2, April 1984, p. L9-L11.

Astronomy and Astrophysics

Astronomy

48

Accretion Disks, Binary Stars, Bl Lacertae Objects, Black Holes (Astronomy), Seyfert Galaxies, X Ray Sources, Active Galactic Nuclei, Electron-Positron Pairs, Luminosity, Pair Production, Quasars, Spectral Signatures, X Ray Spectra

Scientific paper

The X-ray properties of the binary black hole candidates include distinctive bimodal spectral behavior where the X-ray spectra switch between being very soft (alpha greater than 3) and hard (alpha about 0.7). It is pointed out that this spectral transition occurs at about 1 percent L(edd) (for accretion onto a 10 solar masses black hole), and that this corresponds to the luminosity where an optically thick electron-positron pair plasma will form. Active galactic nuclei (AGN) are often considered to be accreting black holes. An X-ray spectral similarity between the above binary sources and both the Seyfert I and BL Lac classes of AGN is demonstrated. As many of these objects radiate most of their luminosity as X-rays, such a similarity may be expected if the underlying mechanisms are similar.

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