Blank Field Sources in the ROSAT HRI Brera Multiscale Wavelet catalog

Details Blank Field Sources in the ROSAT HRI Brera Multiscale Wavelet catalog Blank Field Sources in the ROSAT HRI Brera Multiscale Wavelet catalog

2005-05-13

arxiv.org/abs/astro-ph/0505292v1

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, accepted for publication on A&A

Scientific paper

10.1051/0004-6361:20041726

The search for Blank Field Sources (BFS), i.e. X-ray sources without optical counterparts, paves the way to the identification of unusual objects in the X-ray sky. Here we present four BFS detected in the Brera Multiscale Wavelet catalog of ROSAT HRI observations. This sample has been selected on the basis of source brightness, distance from possible counterparts at other wavelengths, point-like shape and good estimate of the X-ray flux (f_X). The observed f_X and the limiting magnitude of the optical catalogs fix a lower limit for our BFS on f_X/f_opt~40. This value puts them well beyond 90% threshold for usual source classes once HRI energy band and proper spectral shape are taken into account, leaving room for speculation on their nature. Three BFS show also evidence of a transient behaviour.

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