Bright `BLANK Field X-Ray Sources

Details Bright `BLANK Field X-Ray Sources Bright `BLANK Field X-Ray Sources

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...41e&link_type=abstract

Chandra Proposal ID #01900341

Physics

Chandra Proposal Id #01900341

Scientific paper

We are investigating a class of ROSAT X-ray source with extreme f_x/f_opt (>60). These bright sources (fx>10^-13cgs) have no optical counterparts on the Palomar Sky survey, hence we call them `Blank Field' X-ray sources. Deep optical imaging reveals candidates, but chance coincidences with ROSAT error circles are large at these magnitudes. Possibilities for the nature of blank field sources include: isolated neutron stars, `failed' clusters, and `diskless' quasars. AXAF has all the qualities needed to understand these unknown sources: accurate positions to nail the optical counterparts; CCD spectra to test neutron star (very soft) vs. cluster or AGN emission; and detailed imaging to distinguish clusters at any z. We propose short (10ksec) observations of the five best blank field sources.

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