Multiwavelength observations of PKS 2255-282
Date
1999
Authors
Tornikoski, M.
Tingay, S.
Muecke, A.
Chen, A.
Connaughton, V.
Jauncey, D.
Johnston-Hollitt, M.
Kemp, J.
King, E.
McGee, P.
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Journal article
Citation
The Astronomical Journal, 1999; 118(3):1161-1168
Statement of Responsibility
M. Tornikoski, S. J. Tingay, A. Mücke, A. Chen, V. Connaughton, D. L. Jauncey, M. Johnston-Hollitt, J. Kemp, E. A. King, P. McGee, F. Rantakyrö, D. Rayner, O. Reimer, and A. K. Tzioumis
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Abstract
During high radio frequency active galactic nucleus monitoring, we observed a major millimeter wave outburst from PKS 2255-282 in 1997 and initiated a campaign for multifrequency radio monitoring and VLBI imaging of the source. In 1998 January the EGRET instrument on board the Compton Gamma Ray Observatory detected a bright high-energy γ-ray outburst from its direction. Thus, we had the unique opportunity to monitor the source in detail at various radio frequencies already before the detection of the γ-ray outburst. We also initiated multiwavelength follow-up observations. In this paper we present multiwavelength data for PKS 2255-282 before and after the γ-ray outburst. Further, based on the observations, we estimate some physical parameters for this source and discuss the various emission mechanisms possibly involved during this outburst.
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© 1999. The American Astronomical Society