Article (Scientific journals)
INTEGRAL-ISGRI observations of the cygnus OB2 region - Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
De Becker, Michaël; Rauw, Grégor; Pittard, J. M. et al.
2007In Astronomy and Astrophysics, 472 (3), p. 905-910
Peer Reviewed verified by ORBi
 

Files


Full Text
integralcygob2.pdf
Author preprint (214.95 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] Aims. We analyze INTEGRAL-ISGRI data in order to probe the hard X-ray emission ( above 20 keV) from point sources in the CygOB2 region and to investigate the putative non-thermal high-energy emission from early-type stars (Wolf-Rayet and O-type stars). Among the targets located in the field of view, we focus on the still unidentified EGRET source 3EG2033+4118 that may be related to massive stars known to produce non-thermal emission in the radio domain, and on the wide colliding-wind binary WR 140. Methods. Using a large set of data obtained with the IBIS-ISGRI imager onboard INTEGRAL, we run the OSA software package in order to find point sources in the fully coded field of view of the instrument. Results. Our data do not allow the detection of a lower-energy counterpart of 3EGJ2033+4118 nor of any other new point sources in the field of view, and we derive upper limits on the high-energy flux for a few targets: 3EGJ2033+4118, TeVJ2032+4130, WR 140, WR 146 and WR 147. The results are discussed in the context of the multiwavelength investigation of these objects. Conclusions. The upper limits derived are valuable constraints for models aimed at understanding the acceleration of particles in non-thermal emitting massive stars, and of the still unidentified very-high gamma-ray source TeVJ2032+4130.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Pittard, J. M.
Sana, H.
Stevens, I. R.
Romero, G. E.
Language :
English
Title :
INTEGRAL-ISGRI observations of the cygnus OB2 region - Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
Publication date :
September 2007
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
Edp Sciences S A, Les Ulis Cedex A, France
Volume :
472
Issue :
3
Pages :
905-910
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 December 2008

Statistics


Number of views
63 (11 by ULiège)
Number of downloads
65 (5 by ULiège)

Scopus citations®
 
14
Scopus citations®
without self-citations
3
OpenCitations
 
11

Bibliography


Similar publications



Contact ORBi