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Non-thermal radiation from a runaway early-type star
del Valle, M.; Romero, G.E.; De Becker, Michaël
2012In AIP Conference Proceedings, 1505, p. 289-292
 

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Keywords :
Radiation: non-thermal; Gamma-rays; Massive stars; Runaways
Abstract :
[en] HD 195592 is an O-type supergiant star, known as a well-established runaway. Recently, a Fermi γ-ray source (2FGL J2030.7+4417) with a position compatible with that of HD 195592 has been reported. Our goal is to explore a scenario where HD 195592 is the counterpart of the Fermi γ-ray source. The high-energy emission would be inverse Compton radiation produced in the bowshock of the runaway star. We calculate relativistic particle energy losses and the resulting radiation from the bowshock of HD 195592 and show that the latter is compatible with the detected γ-ray emission. We conclude that the Fermi source 2FGL J2030.7+4417 might be produced, under some energetic assumptions, by inverse Compton up-scattering of infrared photons from locally heated dust. HD 195592 might therefore be the very first object detected belonging to the category of γ-ray emitting runaway massive stars, whose existence has been recently predicted.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
del Valle, M.
Romero, G.E.
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Non-thermal radiation from a runaway early-type star
Publication date :
December 2012
Event name :
5th International Meeting on High Energy Gamma-Ray Astronomy
Event organizer :
F. Aharonian, W. Hofmann, F. Rieger
Event place :
Heidelberg, Germany
Event date :
du 9 au 13 juillet 2012
Audience :
International
Journal title :
AIP Conference Proceedings
ISSN :
0094-243X
eISSN :
1551-7616
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
1505
Pages :
289-292
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since 18 March 2013

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