The spectrum and position of the hard Galactic centre source 1E1740.7 - 2942

Details The spectrum and position of the hard Galactic centre source 1E1740.7 - 2942 The spectrum and position of the hard Galactic centre source 1E1740.7 - 2942

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..172s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 172-178.

Astronomy and Astrophysics

Astronomy

40

Galactic Nuclei, Gamma Ray Spectra, X Ray Sources, Black Holes (Astronomy), Cygnus Constellation

Scientific paper

Observations of the remarkable hard Galactic center X-ray and gamma-ray source 1E1740.7 - 2942 made with the TTM and HEXE experiments of the Roentgen observatory on the Kvant module are presented. The spectrum can be well described by a hard power-law with a high-energy cutoff and absorption at low energies. Similarities to the spectra of Cyg X-1 and other black hole candidates suggest that 21E1740.7 - 2942 may also be a black hole binary. The position of this source has been determined with an uncertainty of 12 arcsec, a significant improvement on the precision of earlier measurements.

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