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Observations of 1E 1740.7-2942 with ROSAT and the VLA

Heindl, William A. and Prince, Thomas A. and Grunsfeld, John M. (1994) Observations of 1E 1740.7-2942 with ROSAT and the VLA. Astrophysical Journal, 430 (2, pt. 1). pp. 829-833. ISSN 0004-637X. doi:10.1086/174453.

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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 10^23/ 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.

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Prince, Thomas A.0000-0002-8850-3627
Additional Information:© 1994. The American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1993 December 13; accepted 1994 February 1. We acknowledge important contributions by Shri Kulkarni in several aspects of this work. This research was supported in part by NASA grants NAG5-1687 and NAGW-1919. W. A. H. is supported under the NASA GSRP, NGT-50804.
Group:Space Radiation Laboratory
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Space Radiation Laboratory1995-09
Issue or Number:2, pt. 1
Record Number:CaltechAUTHORS:20140612-113151536
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46242
Deposited By: Deborah Miles
Deposited On:12 Jun 2014 22:07
Last Modified:10 Nov 2021 17:23

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