next previous
Up: Abstract

A&A Supplement series, Vol. 126, December II 1997, 509-517

Received March 10; accepted April 17, 1997

Multiwavelength observations of the field HS47.5/22 in Ursa Majorgif gif

I. The X-ray catalogue of a medium deep ROSAT survey

K. Molthagen tex2html_wrap1633 - H.J. Wendker tex2html_wrap1633 - U.G. Briel tex2html_wrap1637

Send offprint request: K. Molthagen,

tex2html_wrap1639  Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
tex2html_wrap1641  Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany


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 tex2html_wrap_inline1619, 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.

keywords: methods: data analysis -- catalogues --
surveys -- X-rays: general -- X-rays: galaxies

Copyright by the European Southern Observatory (ESO)