First results from the ROSAT wide field camera source identification programme
Abstract
Results are presented of the all-sky survey in the EUV band, between 70 and 200 A, by the UK Wide Field Camera (WFC) instrument on Rosat. The survey revealed large numbers of EUV sources, many of which are not associated with objects cataloged previously in other wavebands. The status of the program after the first two weeks of observations on the INT, in January and February 1991, and approximately two weeks of observing time at SAAO in November and December 1990. The WFC provided images of virtually the whole sky in two EUV colors, covering the approximate bands 70-140 A and 110-200 A. On the basis of this procedure, a list of astronometric positions, magnitudes, and colors for each star within or near each WFC error circle is drawn up. Candidate stars are prioritized according to separation from the EUV position, brightness, color and extension, and the charts plus ordered candidate lists are taken to the telescope for spectroscopic identification. The distribution of source types identified as part of the optical ID program is presented.
- Publication:
-
Vistas in Astronomy
- Pub Date:
- 1991
- DOI:
- 10.1016/0083-6656(91)90013-I
- Bibcode:
- 1991VA.....34..343M
- Keywords:
-
- Extreme Ultraviolet Radiation;
- Rosat Mission;
- Sky Surveys (Astronomy);
- Astronomical Observatories;
- Astronomical Spectroscopy;
- Stellar Magnitude;
- Ultraviolet Emission;
- Astrophysics