Search for Hot Primordal Gas in a Failed Cluster of Galaxies Candidate 0806+20

Details Search for Hot Primordal Gas in a Failed Cluster of Galaxies Candidate 0806+20 Search for Hot Primordal Gas in a Failed Cluster of Galaxies Candidate 0806+20

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1010h&link_type=abstract

Chandra Proposal ID #03800748

Physics

Chandra Proposal Id #03800748

Scientific paper

Failed cluster of galaxies is a hypothetical object of large gas cloud of which collapse time exceeds the Hubble time. Such cloud, if exists, failed to form galaxies in it and should not have metal in it. 0806+20 is the prime candidate of such objetct, extracted from the Einstein data base as an extended source without optical counterpart. Although ASCA observation of this source did not reveal spatial extenstion, ASCA X-ray spectrum is fitted with a power law or thin thermal model, with a marginal detection of redshifted (z or 0.5-0.6) iron line. No optical counterpart was detected with a limiting R mag of 24. From these, 0806+20 may be 1) a distant (usual or failed) cluster, 2) a unusually optically faint quasar. Chandra X-ray image will reveal which is the solution.

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