Rapid X-ray variability of PKS 2155-304

Details Rapid X-ray variability of PKS 2155-304 Rapid X-ray variability of PKS 2155-304

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237l..11s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 237, Apr. 1, 1980, p. L11-L14.

Astronomy and Astrophysics

Astronomy

44

Bl Lacertae Objects, Pulsed Radiation, Spaceborne Astronomy, X Ray Sources, Astronomical Spectroscopy, Calcium, Heao 1, Iron, Light Curve, Line Spectra, Sky Surveys (Astronomy), Variability, X Ray Spectra

Scientific paper

The X-ray emitting BL Lacertae object PKS 2155-304 was observed with NRL's Large Area Sky Survey Experiment on HEAO 1 during November 10-16, 1977. Variations of a factor of 2 in the 0.5-20 keV intensity are found on time scales as short as 6 hours. Variations on time scales of 1 s, as reported by the HEAO A-2 LED experiment, are not confirmed in near-simultaneous observations. Optical spectroscopy is also presented which does not confirm the presence of previously reported redshifted (Z = 0.17) forbidden O III line emission. The question of the redshift of this object is still open.

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