AAS 203rd Meeting, January 2004
Session 79 Blazars
Poster, Wednesday, January 7, 2004, 9:20am-6:30pm, Grand Hall

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[79.03] Results and Discussion of Simultaneous Monitoring of the BL Lac Object PG~1553+11 in the Radio, Optical, and X-ray Regimes

M. A. Osterman, H. R. Miller (Georgia State U.), H. Aller, M. Aller (U. of Michigan), R. Fried (Arizona State U.), O. Kurtanidze (Abastumani Observatory), M. Tornikoski (Helsinki U. of Technology)

PG~1553+11 was first identified as a blazar in 1977. It is a BL Lac object with z = 0.36 and its optical magnitude varies from about 13 to 15.5. Subsequent observations revealed that this object is rather weak in the radio for a blazar, exhibiting fluxes of a few tenths of a Jy. It hasn't been studied well in the X-ray regime. We chose PG~1553+11 as the target of a multi-wavelength campaign covering about three weeks during April and May of this year. The radio observations were obtained at 37 GHz at the Metsahovi Radio Observatory in Finland and at 14.5 GHz at the University of Michigan. Optical (R and B band) observations were obtained at the Abastumani Observatory in Georgia and at Braeside Observatory in Arizona. The X-ray observations were performed with RXTE. In this paper, we present the results from our multi-frequency campaign. A well-defined X-ray flare was detected during this campaign and, in conjunction with the radio and optical observations, is used to constrain various models for blazars, e.g. shock in jet, synchrotron self-Compton, external Compton, etc. This work was supported in part by grants from NASA, the Research Corp., and GSU's PEGA RPE program.

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