Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-02
Astron.J.132:873-882,2006
Astronomy and Astrophysics
Astrophysics
28 pages, 4 figures, 7 tables. Accepted for publication in AJ
Scientific paper
10.1086/505565
PG 1553+11 was the target of a coordinated three week multiwavelength campaign during 2003 April and May. A significant X-ray flare was observed during the second half of this campaign. Although no optical flare was recorded during the X-ray campaign, optical observations obtained immediately prior to the campaign displayed a higher flux than that recorded during the campaign. An optical flare was observed a few days after the end of the X-ray campaign and may be related to the X-ray flare. Radio observations were made at three frequencies, with no significant changes in flux detected near the times of the optical and X-ray flares. The spectral energy distributions and flux ratios in different wavebands observed for this object are compared to other X-ray selected blazars to demonstrate how PG 1553+11 is an extreme member of this group.
Aller Hugh
Aller Margo
Campbell Amy Marie
Fried Robert E.
Kurtanidze Omar M.
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