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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ; ;  [10] ; ;  [11] ;  [12] ;  [13] ;  [14]
  1. The Catholic University of America, 620 Michigan Avenue NE, Washington, DC 20064 (United States)
  2. ORAU/NASA Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20771 (United States)
  3. Center for Research and Exploration in Space Science and Technology (CRESST), University of Maryland Baltimore Campus (UMBC) and NASA Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20771 (United States)
  4. Naval Research Laboratory, Space Science Division, Code 7653, 4555 Overlook Avenue SW, Washington, DC 20375 (United States)
  5. CSIRO Astronomy and Space Science, Locked Bag 194, Narrabri, NSW 2390 (Australia)
  6. CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW 1710 (Australia)
  7. Departamento de Astronoma, Universidad de Concepción, Casilla 160 C, 4089100 Concepción (Chile)
  8. School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tas 7001 (Australia)
  9. INAF/IAPS, via Fosso del Cavaliere 100, I-00133 Roma (Italy)
  10. Lehrstuhl für Astronomie, Universität Würzburg, Emil-Fischer-Straße 31, D-97074 Würzburg (Germany)
  11. Remeis Observatory and ECAP, Sternwartstr. 7, D-96049 Bamberg (Germany)
  12. University of Perugia, Piazza Università 1, I-06123 Perugia (Italy)
  13. Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma Santa Cruz de Tenerife (Spain)
  14. NASA Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
22348388
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTRIBUTION; ENERGY SPECTRA; GALAXIES; GAMMA RADIATION; MAGNETIC FIELDS; QUASARS; ULTRAVIOLET RADIATION; WAVELENGTHS; X RADIATION