Understanding the Nature of ROSAT Bfs

Details Understanding the Nature of ROSAT Bfs Understanding the Nature of ROSAT Bfs

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..659c&link_type=abstract

Chandra Proposal ID #02700384

Physics

Chandra Proposal Id #02700384

Scientific paper

The X-ray sky is not as well known as sometimes thought. We are searching for intriguing populations; one of these are the `blank field sources'(BFS). We call BFS all the bright ROSAT sources (F_X > 1e-13 erg/cm2/s) with no optical counterpart on the Palomar Sky survey (to O=21.5) within their 39" (99%) radius error circle (a typical type 1 AGN at these X-ray fluxes would have B~18). Although they are not rare (~5% of ROSAT high |b| sources) their nature is still mysterious. The faint optical flux makes their optical identification difficult. We propose use Chandra to obtain: an accurate position to nail the optical counterparts, an X-ray spectrum to understand the nature of these sources and detailed imaging for extension information.

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