Issue |
Astron. Astrophys. Suppl. Ser.
Volume 126, Number 3, December II 1997
|
|
---|---|---|
Page(s) | 509 - 517 | |
DOI | https://doi.org/10.1051/aas:1997391 | |
Published online | 15 December 1997 |
Multiwavelength observations of the field HS 47.5/22 in Ursa Major *,**
I. The X–ray catalogue of a medium deep ROSAT survey
1
Hamburger Sternwarte, Gojenbergsweg 112, D–21029 Hamburg, Germany
2
Max–Planck–Institut für extraterrestrische Physik, D–85740 Garching, Germany
Send offprint request to: K. Molthagen
Received:
10
March
1997
Accepted:
17
April
1997
We present the X–ray source catalogue obtained from a ROSAT survey in the
HQS field HS 47.5/22. The survey consists of 48 overlapping PSPC pointings
which were first analysed individually, and then merged to increase the
sensitivity. Both modes bring forth sources missed in the other, showing
that both are necessary to detect all X–ray sources in the field. The
final catalogue contains 574 X–ray sources. The identifications are mainly
based on the HQS objective prism plate which allows object classification
down to a magnitude ,
and a rough distinction between red and blue objects more than a magnitude
deeper. Follow–up observations were performed for a number of objects,
mainly faint quasar candidates.
Key words: methods: data analysis / catalogues / surveys / X–rays: general / X–rays: galaxies
Partly based on observations from the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy.
© European Southern Observatory (ESO), 1997