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Rapid X-ray variability of PKS 2155-304

DOI

18

Citations

0

References

1980

Year

W. A. Snyder, A. F. Davidsen, K. Wood, R. E. Kinzer, H. W. Smathers, S. Shulman, J. F. Meekins, D. Yentis, W. D. Evans, E. T. Byram,
The Astrophysical Journal

Abstract

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.