Low Surface Brightness X-ray Clusters of Galaxies

Details Low Surface Brightness X-ray Clusters of Galaxies Low Surface Brightness X-ray Clusters of Galaxies

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..254l&link_type=abstract

NOAO Proposal ID #2000A-0254

Computer Science

Scientific paper

We propose to continue our search for Low Surface Brightness (LSB) X- ray clusters to discover enough additional LSB clusters to both assess their impact on the evolution of the X-ray luminosity function (XLF) and to characterize their basic nature. Using our revision to the catalog of X-ray sources from the work of Gaidos (1996), we have identified a sample of LSB cluster candidates which lie within the sky region of the EMSS X-ray survey. In December 1997 and 1998, we discovered 3 clusters among 45 random source fields observed, implying that 2-3% (12-17 sources) in the entire Gaidos catalog are distant clusters and thus potential additions to the EMSS cluster sample. Because this number is insufficient both to make an accurate assessment of the impact of LSB clusters on the XLF and its possible evolution and to have enough LSB candidate clusters in-hand to assess their basic nature spectroscopically, we request 5 nights on the 2.1m for each of the next two semesters to identify 10-15 new LSB clusters. Lessons learned from our just completed work will help us pre-select Gaidos sources that are most likely distant clusters. Followup multi-object spectroscopy to confirm the clusters and to measure their redshifts and X-ray luminosities will be requested when we have sufficient candidates in- hand.

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