X-ray and optical observations of X-ray-selected BL Laceratae objects

Details X-ray and optical observations of X-ray-selected BL Laceratae objects X-ray and optical observations of X-ray-selected BL Laceratae objects

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..662g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 662-672. ESA-CNR-supported research.

Astronomy and Astrophysics

Astronomy

34

Bl Lacertae Objects, Light Curve, X Ray Sources, Exosat Satellite, Monte Carlo Method, Stellar Luminosity, X Ray Astronomy

Scientific paper

Results from several X-ray and optical observations of five X-ray-selected BL Lacertae objects are reported. X-ray light curves covering periods of up to 6 yr reveal that the X-ray flux from these objects does not show large-amplitude trends over this time scale. Variations of up to 2 mag have been observed in the optical. The soft X-ray spectra of three objects have been measured with the Exosat Medium Energy detectors. Energy spectral indices range between one and two. In one case (1E 1415.6 + 2557), evidence for photoelectric absorption in excess of that due to the local interstellar medium has been found. A new optical flare from 1E 1402.3 + 0416, with rise and decay time of order of a few weeks, has been detected.

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