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.
https://resolver.caltech.edu/CaltechAUTHORS:20140612-113151536
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Abstract
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.
| Item Type: | Article |
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| 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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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAG5-1687 | | NASA | NAGW-1919 | | NASA | GSRP NGT-50804 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1995-09 |
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| Issue or Number: | 2, pt. 1 |
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| DOI: | 10.1086/174453 |
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| Record Number: | CaltechAUTHORS:20140612-113151536 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140612-113151536 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 46242 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Deborah Miles
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| Deposited On: | 12 Jun 2014 22:07 |
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| Last Modified: | 10 Nov 2021 17:23 |
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