Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..829h&link_type=abstract
The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 829-833
Astronomy and Astrophysics
Astrophysics
13
Black Holes (Astronomy), Bremsstrahlung, Energy Bands, Molecular Clouds, Radio Jets (Astronomy), X Ray Spectra, X Ray Stars, Astrophysics, Radio Astronomy, Rosat Mission, Spectrum Analysis, Stellar Luminosity, Thermal Emission, Very Large Array (Vla)
Scientific paper
We have observed the Galactic black hole candidate 1E 1740.7-2942 in X-rays with both the ROSAT high resolution imager (HRI) and position-sensitive proportional counter (PSPC) and at 1.5 and 4.9 GHz with the very large array (VLA). From the HRI observation we derive a position for 1E 1740.7-2942 of right ascension = 17h 43m 54.9s, declination = -29 deg 44 min 45.3 sec (J2000), with a 90% confidence error circle of radius 8.5 sec. Thermal bremsstrahlung fits to the PSPC data yield a column density of 1.12 + 1.51 or -0.18 X 1023/ sq cm, consistent with earlier X-ray measurements. The VLA observations of 4.9 GHz revealed two sources. Source A, which is the core of a double aligned radio jet source (Mirabel et al. 1992), lies within the ROSAT error circle, further confirming its identification with 1E 1740.7-2942.
Grunsfeld John M.
Heindl William A.
Prince Thomas A.
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