Rapid X-ray and optical variability in the X-ray selected BL Lacertae object IE 1402.3 + 0416

Details Rapid X-ray and optical variability in the X-ray selected BL Lacertae object IE 1402.3 + 0416 Rapid X-ray and optical variability in the X-ray selected BL Lacertae object IE 1402.3 + 0416

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..596g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 596-600. ESA-supported research.

Astronomy and Astrophysics

Astrophysics

9

Bl Lacertae Objects, X Ray Sources, Emission Spectra, Exosat Satellite, Heao 2, Magnitude, Radiant Flux Density, Spectral Energy Distribution, Variability, X Ray Spectra

Scientific paper

Results from X-ray and optical observations of the X-ray-discovered BL Lac object 1E 1402.3 + 0416 are presented, where the X-ray measurements were carried out with the Channel Multiplier Array (CMA) and Medium Energy experiment (ME) detectors on board Exosat. These measurements revealed an intensity decrease by a factor of two on a time scale of a few hours. At maximum flux, the source was significantly greater than at the time of the Einstein Image Proportional Counter (IPC) discovery observation. The 2-6 keV X-ray spectrum was determined by the ME experiment, and IPC, HRI, and CMA data were subsequently compared. The source varied over the years by a factor of five; its brightest state was within the last three years. It is noted that a redshift greater than 0.2 would require that anisotropic emission mechanisms be invoked.

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