Discovery of a BL Lacertae object (EXO 055625-3838.6) in the error box of H0557-385

Details Discovery of a BL Lacertae object (EXO 055625-3838.6) in the error box of H0557-385 Discovery of a BL Lacertae object (EXO 055625-3838.6) in the error box of H0557-385

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.236..375g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 236, Jan. 15, 1989, p. 375-383.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Bl Lacertae Objects, X Ray Sources, Error Analysis, Exosat Satellite, Light Curve, Seyfert Galaxies, Visible Spectrum

Scientific paper

X-ray and optical data reveal a new BL Lac object (EXO 055625-3838.6) within the error box of H0557-385. The long-term hard X-ray light curve of H0557-385 is found to vary by factor of not less than 10. It is noted that the reclassification as BL Lacs of even a very small number of the HEAO1 survey sources would suggest that the previous estimate of the space density of these objects at fluxes of greater than 10 to the -11th erg/sq cm per s should be substantially increased.

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