1995/09/11 by L. R. Jones, Jones, L. R., C. A. Scharf +11
Medicine · Physics and Astronomy · #Advanced X-ray Imaging Techniques #Astrophysics (astro-ph) #FOS: Physical sciences #Medical Imaging Techniques and Applications #Particle Detector Development and Performance #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9509061
4 pages uuencoded compressed Postscript, Figure on request. To appear in proceedings of `Clusters, Lensing and the Future of the Universe', 187th ASP meeting, College Park, 1995
arxiv created 1995/09/11 · openalex publication_date 1995/09/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have searched for extended X-ray sources in the ROSAT PSPC archive using the Voronoi Tesslation and Percolation algorithm (VTP). This algorithm detects all significant sources regardless of shape or size, and is particularly suited to finding low surface brightness extended sources which could be missed or wrongly interpreted by other algorithms. In an initial 13 sq deg (66 fields) we have found 22 sources with detected flux >7x10-14 erg cm-2 s-1 (0.5-2 keV) and sizes of 1 to 5 arcmin. Optically, they range from a single bright nearby galaxy which has been resolved, an Abell cluster which is revealed to have two (probably merging) components, and groups and clusters of galaxies at estimated redshifts beyond z=0.4. This work is part of an ongoing survey with the aims of (a) measuring the low luminosity (0.2) X-ray luminosity function of clusters, and (b) investigating cluster morphologies and unusual systems (eg `fossil' groups).