Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385l..17b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. L17-L20.
Astronomy and Astrophysics
Astronomy
14
Galactic Nuclei, Milky Way Galaxy, X Ray Astronomy, Astronomical Spectroscopy, Black Holes (Astronomy), Proportional Counters
Scientific paper
Evidence is reported of strong flux variability in the hard X-ray range from IE 1740.7 - 2942 obtained during an observation of the region on May 17, 1989. The measurement was performed with a high-sensitivity array of multiwire proportional counter operative in the energy range 15-180 keV, and with a field of view of 1.9 deg FWHM. The data, when compared with previous data in the same energy range obtained either by a narrow-field of view or imaging instruments, imply a flux variability of a factor of 3 at 40 keV and 2.5 at 100 keV. The spectrum of May 17, 1989, can be described by a single power law with a spectral index of 1.95 and an intensity of 0.000285/sq cm/s keV at 30 keV. The detection of 1E 1740.7 - 2942 in a condition very close to the low state of Cyg X1 confirms the similarity between these two sources, thus supporting the black hole nature of the Galactic center high-energy emitter.
Bazzano Angela
La Padula C.
Sood Ravi K.
Ubertini Pietro
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