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Published August 1, 1994 | Published
Journal Article Open

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


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.

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.

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August 20, 2023
August 20, 2023