MULTI-WAVELENGTH OBSERVATIONS OF PKS 2142−75 DURING ACTIVE AND QUIESCENT GAMMA-RAY STATES
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Dutka, Michael S., Roopesh Ojha, Katja Pottschmidt, Justin D. Finke, Jamie Stevens, Philip G. Edwards, Jay Blanchard, et al. “Multi-Wavelength Observations of PKS 2142−75 During Active and Quiescent Gamma-Ray States.” The Astrophysical Journal 779, no. 2 (December 2013): 174. https://doi.org/10.1088/0004-637X/779/2/174.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
PKS 2142−75 (a.k.a. 2FGL J2147.4−7534) is a flat-spectrum radio quasar that was observed quasi-simultaneously by a suite of instruments across the electromagnetic spectrum during two flaring states in 2010 April and 2011 August as well as a quiescent state from 2011 December through 2012 January. The results of these campaigns and model spectral energy distributions (SEDs) from the active and quiescent states are presented. The SED model parameters of PKS 2142−75 indicate that the two flares of the source are created by unique physical conditions. SED studies of flat-spectrum radio quasars are beginning to indicate that there might be two types of flares, those that can be described purely by changes in the electron distribution and those that require changes in other parameters, such as the magnetic field strength or the size of the emitting region.