New X-ray bright BL Lacertae objects from the ROSAT All-Sky Survey

Details New X-ray bright BL Lacertae objects from the ROSAT All-Sky Survey New X-ray bright BL Lacertae objects from the ROSAT All-Sky Survey

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..381b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 381-388

Astronomy and Astrophysics

Astronomy

31

Absorption Spectra, Active Galactic Nuclei, Bl Lacertae Objects, Emission Spectra, Radio Sources (Astronomy), X Ray Astronomy, X Ray Sources, X Ray Spectra, Astronomical Catalogs, Rosat Mission, Sky Surveys (Astronomy)

Scientific paper

We detected 10 new BL Lac objects in the course of an ongoing identification program of ROSAT All Sky Survey (RASS) sources. They were found by follow-up spectroscopy of active galactic nuclei (AGN) candidates identified on digitized objective prism and direct photographic plates. All optical spectra show strong non-thermal continua with no detectable emission lines. In two cases, absorption lines enabled us to determine a redshift. For the majority of the sources the X-ray to optical flux ratio is extremely high, exceeding in many cases the highest value found for emission line AGN. This suggests to use this ratio as an efficient selection criterion for BL Lac objects in the RASS. As radio measurements are not required, this criterion is specially appropriate to select radio faint BL Lac objects. For most of the objects studied sufficient X-ray counts were gathered in the RASS to allow a detailed spectral analysis. Basically no differences were found between the properties of the new sources and those of already known BL Lac objects. The only exception is RXJ10313+5053 which shows a significant flattening of the soft X-ray spectrum beyond 0.7 keV.

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