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Multi-wavelength observations of PKS 2142-75 during active and quiescent gamma-ray states


Dutka, MS and Ojha, R and Pottschmidt, K and Finke, JD and Stevens, J and Edwards, PG and Blanchard, J and Lovell, JEJ and Nesci, R and Kadler, M and Wilms, J and Tosti, G and Pursimo, T and Krauss, F and Muller, C and Gehrels, N, Multi-wavelength observations of PKS 2142-75 during active and quiescent gamma-ray states, Astrophysical Journal, 779, (2) Article 174. ISSN 0004-637X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The American Astronomical Society

DOI: doi:10.1088/0004-637X/779/2/174


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.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active, gamma rays: galaxies, quasars: individual (PKS 2142–75), radio continuum: galaxies, ultraviolet: galaxies, X-rays: individual (PKS 2142–75)
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:88684
Year Published:2013
Web of Science® Times Cited:16
Deposited By:Mathematics and Physics
Deposited On:2014-02-12
Last Modified:2017-11-03

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