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Short Time Scale Variability of Active Galactic Nuclei: Einstein IPC Observations of PKS 2155-304 - A Report of Rapid Variations of Instrumental Origin

Published online by Cambridge University Press:  07 August 2017

J. H. Beall ,
W. A. Snyder  and
K. S. Wood
J. H. Beall
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA St. John's College, Annapolis, MD, USA
W. A. Snyder
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA
K. S. Wood
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA

Abstract

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The Einstein IPC observed the bright (5 mCrab) X-ray emitting BL Lac Object PKS 2155-304 on 1979 November 4th and 5th through 7th and on 1980 May 16th through 18th. A total of 17.4 hours were spent monitoring the source. Changes in intensity of between 10–50% are evident in the data for time scales of days and months. The source was constant to within 10% of the mean intensity on hourly time scales for all intervals of data except one. Repeated factor of 2 variations in intensity, occuring on 10–30 second time scales, were observed during the first 50 minutes of the 1979 Nov. 5th observation. These variations, however, were anticorrelated with variations seen in an adjacent background region. Concurrent MPC observations also failed to confirm the rapid changes, although they should have been readily detected. Thus, we conclude that the observed rapid variations are not intrinsic to the source, but originated in the IPC. These results can have implications for other IPC reports of short time scale variability for active galaxies and for source models based on such observations.

Type
Part 2: BLR and Variability
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 106 - 107
Copyright
Copyright © Kluwer 1989 

References

Beall, J.H. et al. 1986, Ap.J., 308, 563.CrossRefGoogle Scholar
Doxsey, R. et al. 1983, Ap.J., 264, L43.CrossRefGoogle Scholar
Feigelson, E.D. et al. 1986, Ap.J., 302, 337.Google Scholar
Giacconi, R., et al. 1979, Ap.J., 230, 540 CrossRefGoogle Scholar
Pounds, K.A. and Turner, T.J. 1986 (AAA:Milano-Bologna) Treves, A., ed.Google Scholar