Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties

Juan Carlos Algaba, Sang Sung Lee, Bindu Rani, Dae Won Kim, Motoki Kino, Jeffrey Hodgson, Guang Yao Zhao, Do Young Byun, Mark Gurwell, Sin Cheol Kang, Jae Young Kim, Jeong Sook Kim, Soon Wook Kim, Jong Ho Park, Sascha Trippe, Kiyoaki Wajima

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The flat-spectrum radio quasar 1633+382 (4C 38.41) showed a significant increase of its radio flux density during the period 2012 March-2015 August, which correlates with γ-ray flaring activity. Multi-frequency simultaneous very long baseline interferometry (VLBI) observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional radio monitoring observations with the OVRO 40 m telescope, the Boston University VLBI program, and the Submillimeter Array. The epochs of the maxima for the two largest γ-ray flares coincide with the ejection of two respective new VLBI components. Analysis of the spectral energy distribution indicates a higher turnover frequency after the flaring events. The evolution of the flare in the turnover frequency-turnover flux density plane probes the adiabatic losses in agreement with the shock-in-jet model. The derived synchrotron self-absorption magnetic fields, of the order of 0.1 mG, do not seem to change dramatically during the flares, and are much weaker, by a factor 104, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle-dominated emitting region.

Original languageEnglish
Article number128
JournalAstrophysical Journal
Volume859
Issue number2
DOIs
StatePublished - 1 Jun 2018

Bibliographical note

Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.

Keywords

  • galaxies: active
  • galaxies: jets
  • quasars: individual (4C 38.41)

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