Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..225w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 1, pp. 225-234.
Astronomy and Astrophysics
Astronomy
12
Bl Lacertae Objects: General, Radio Continuum: Galaxies, X-Rays: Galaxies
Scientific paper
We discuss a new method for finding BL Lac objects based on their multifrequency properties. BL Lacs are both X-ray and radio loud, thus a programme aimed at the optical identification of radio emitting X-ray (REX) sources has the potential of being highly efficient (expected success rate of ~20-30 per cent) in finding them. Here we present the results of a pilot study in which 17 REX have been obtained from the cross-correlation of X-ray sources from 35 PSPC images with a 6-cm radio catalogue. Eleven sources have been identified, either through optical spectra obtained by us (6 sources) or by a search in the literature (5 sources), with a success rate of 2/11. We intend to pursue a systematic search for BL Lac objects, exploiting all the available and suitable PSPC data and radio catalogues. Our goal is to create a sample of more than 100 BL Lac objects at an X-ray flux limit of ~5x10^-14 erg cm^-2 s^-1. This sample will allow us to fill the parameter space of the BL Lac population in a more extended way than previously possible and, therefore, to check more thoroughly the relation between statistical and physical properties of this class of objects.
Ciliegi Paolo
della Ceca Roberto
Gioia Isabella Maria
Giommi Paolo
Henry Patrick J.
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