Discovery of a new BL Lacertae object /1E 1402.3 + 0416/ with the Einstein Observatory

Details Discovery of a new BL Lacertae object /1E 1402.3 + 0416/ with the Einstein Observatory Discovery of a new BL Lacertae object /1E 1402.3 + 0416/ with the Einstein Observatory

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200p..27s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 27P-32P. NSF No. AST-78-22714;

Astronomy and Astrophysics

Astronomy

18

Bl Lacertae Objects, Blue Stars, Heao 2, X Ray Sources, Active Galaxies, Background Radiation, Galactic Nuclei, Quasars, Radiant Flux Density, Seyfert Galaxies, Spectrophotometry, Stellar Evolution

Scientific paper

It is noted that only one BL Lac object, designated 1E 1402.3 + 0416, has so far been discovered as part of an optical identification program for a complete sample of faint X-ray sources detected with the Einstein Observatory. Consistent with previously X-ray-discovered BL Lacs, this object is blue and radio weak (17 mJy at 6 cm). It is pointed out that the percentage of BL Lacs in the faint extragalactic X-ray sample (2%) is smaller than the percentage at higher X-ray fluxes (6%). Over the same range in X-ray flux, the percentage of emission-line active galaxy nuclei (QSO + Seyferts) rises from 40% to 74%). This is seen as suggesting that BL Lacs do not evolve in a manner similar to quasars and are, therefore, not substantial contributors to the X-ray background.

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