My main research interests are (in almost random order):
X-ray cluster surveys
Systematic searches for clusters of galaxies have traditionally been conducted at optical wavelengths, the main selection criterion being the apparent number density of galaxies as seen in projection on the sky. While some of the resulting optical catalogues still constitute the largest compilations of clusters of galaxies in existence, the biases inherent to the optical selection process (most importantly projection effects) are difficult to correct for in statistical studies of cluster properties.
X-ray selection overcomes most of the optical biases as the X-ray emission is an immediate indicator of the presence of gravitationally bound and heated gas. X-ray observations of galaxy clusters thus allow the compilation of cluster samples that are almost unaffected by projection effects.
A new era for the compilation of large-area, X-ray selected cluster
samples began in 1990 with the launch of the ROSAT satellite. In 1990-1991 ROSAT completed the
first all-sky survey ever conducted with an
imaging X-ray telescope, before turning to pointed observations of
selected individual targets for the remainder of its 9-year
mission. The resulting databases are gold mines for the compilation of
large X-ray selected cluster samples.
With the exception of the EMSS, all of the above cluster surveys are based on ROSAT data.
I am involved in a number of X-ray cluster surveys, some of which are not accessible through the above clickable map - so here is the complete list of `my' cluster surveys:
more to be done...
(page last updated by H. Ebeling, February 15, 2001)