Origin and evolution of the multi–band variability in the flat spectrum radio source 4C 38.41

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; Jongh Ho Park; Sascha Trippe; Kiyoaki Wajima

Origin and evolution of the multi–band variability in the flat spectrum radio source 4C 38.41

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, Jongh Ho Park, Sascha Trippe, Kiyoaki Wajima

Department of Physics and Astronomy

Research output: Contribution to journal › Conference article › peer-review

Abstract

The flat spectrum radio quasar 4C 38.41 showed a significant increase of its radio flux density during the period 2012 March - 2015 August which correlates with gamma-ray flaring activity. Multi-frequency simultaneous VLBI observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional monitoring observations at various bands across the electromagnetic spectrum. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components and the evolution of the physical properties seem to be in agreement with the shock-in-jet model. Derived synchrotron self absorption magnetic fields, of the order of 0.1 mG, do not seem to dramatically change during the flares, and are much smaller, by a factor 10,000, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle dominated emitting region.

Original language	English
Journal	Proceedings of Science
Volume	344
State	Published - 2018
Event	14th European VLBI Network Symposium and Users Meeting, EVN 2018 - Granada, Spain Duration: 8 Oct 2018 → 11 Oct 2018

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Cite this

@article{651c8f519d58453bab633891a9857ccc,

title = "Origin and evolution of the multi–band variability in the flat spectrum radio source 4C 38.41",

abstract = "The flat spectrum radio quasar 4C 38.41 showed a significant increase of its radio flux density during the period 2012 March - 2015 August which correlates with gamma-ray flaring activity. Multi-frequency simultaneous VLBI observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional monitoring observations at various bands across the electromagnetic spectrum. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components and the evolution of the physical properties seem to be in agreement with the shock-in-jet model. Derived synchrotron self absorption magnetic fields, of the order of 0.1 mG, do not seem to dramatically change during the flares, and are much smaller, by a factor 10,000, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle dominated emitting region.",

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

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 14th European VLBI Network Symposium and Users Meeting, EVN 2018 ; Conference date: 08-10-2018 Through 11-10-2018",

year = "2018",

language = "English",

volume = "344",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - Origin and evolution of the multi–band variability in the flat spectrum radio source 4C 38.41

AU - Algaba, Juan Carlos

AU - Lee, Sang Sung

AU - Rani, Bindu

AU - Kim, Dae Won

AU - Kino, Motoki

AU - Hodgson, Jeffrey

AU - Zhao, Guang Yao

AU - Byun, Do Young

AU - Gurwell, Mark

AU - Kang, Sin Cheol

AU - Kim, Jae Young

AU - Kim, Jeong Sook

AU - Kim, Soon Wook

AU - Park, Jongh Ho

AU - Trippe, Sascha

AU - Wajima, Kiyoaki

PY - 2018

Y1 - 2018

N2 - The flat spectrum radio quasar 4C 38.41 showed a significant increase of its radio flux density during the period 2012 March - 2015 August which correlates with gamma-ray flaring activity. Multi-frequency simultaneous VLBI observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional monitoring observations at various bands across the electromagnetic spectrum. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components and the evolution of the physical properties seem to be in agreement with the shock-in-jet model. Derived synchrotron self absorption magnetic fields, of the order of 0.1 mG, do not seem to dramatically change during the flares, and are much smaller, by a factor 10,000, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle dominated emitting region.

AB - The flat spectrum radio quasar 4C 38.41 showed a significant increase of its radio flux density during the period 2012 March - 2015 August which correlates with gamma-ray flaring activity. Multi-frequency simultaneous VLBI observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional monitoring observations at various bands across the electromagnetic spectrum. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components and the evolution of the physical properties seem to be in agreement with the shock-in-jet model. Derived synchrotron self absorption magnetic fields, of the order of 0.1 mG, do not seem to dramatically change during the flares, and are much smaller, by a factor 10,000, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle dominated emitting region.

UR - http://www.scopus.com/inward/record.url?scp=85075106656&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85075106656

SN - 1824-8039

VL - 344

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 14th European VLBI Network Symposium and Users Meeting, EVN 2018

Y2 - 8 October 2018 through 11 October 2018

ER -

Origin and evolution of the multi–band variability in the flat spectrum radio source 4C 38.41

Abstract

Bibliographical note

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