Two spectral states of the black-hole candidate GX 339-4

Details Two spectral states of the black-hole candidate GX 339-4 Two spectral states of the black-hole candidate GX 339-4

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..433l&link_type=abstract

Astronomy Letters, Volume 23, Issue 4, July 1997, pp.433-438; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 496

Astronomy and Astrophysics

Astronomy

Scientific paper

We performed two series of observations of the X-ray source GX 339-4, a black-hole candidate, between 1989 and 1994 using the TTM instrument of the Roentgen Observatory. In March 1989, the source was in a soft state with a spectrum described by a multicolor accretion disk model (Shakura and Sunyaev 1973). In March 1994, a hard state with a power-law spectrum and a transition from the hard to the soft state was observed. The spectral states of the source show similarities to the spectra of other black-hole candidates. The presence of two states is considered as evidence that GX 339-4 belongs to this class of objects.

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