Observations of 1E 1740.7-2942 with ROSAT and the VLA
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.
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.Attached Files
Published - 1995-09.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:7bac0aa00f6af8f4315c71e2667a1be3
|
1.8 MB | Preview Download |
Additional details
- Eprint ID
- 46242
- Resolver ID
- CaltechAUTHORS:20140612-113151536
- NASA
- NAG5-1687
- NASA
- NAGW-1919
- NASA
- GSRP NGT-50804
- Created
-
2014-06-12Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1995-09