Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464l..71c&link_type=abstract
Astrophysical Journal Letters v.464, p.L71
Astronomy and Astrophysics
Astronomy
19
Galaxy: Center, Ism: Clouds, Stars: Individual Alphanumeric: 1E 1740.7-2942, X-Rays: General
Scientific paper
The discovery of the molecular cloud (Bally & Leventhal; Mirabel et al.) in the direction of bright and hard X-ray source 1E 1740.7-2942 raised the hypothesis that the unique properties of this object are related to the presence of a dense gas near the compact source. In particular, Bondi-Hoyle accretion onto a single black hole (Bally & Leventhal; Mirabel et al.) or onto a black hole in a binary system (Chen, Gehrels, & Leventhal) has been discussed. We have shown below that the weakness of the 6.4 keV line in the Advanced Satellite for Cosmology and Astrophysics (ASCA) data strongly constrains averaged column density of the gas surrounding the source to the values NH <= 2 x 1022 cm-2. If most of the low-energy absorption in the direction of the source (NH ~ 1023 cm-2) is due to the dense molecular cloud, then the compact source must be located behind the cloud. This would imply that Bondi-Hoyle accretion is unlikely the mechanism responsible for feeding the compact source.
Churazov Eugene
Gilfanov Marat
Sunyaev Rachid
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