Article (Scientific journals)
Hard X-ray emission clumps in the gamma-Cygni supernova remnant: An INTEGRAL-ISGRI view
Bykov, A. M.; Krassilchtchikov, A. M.; Uvarov, Y. A. et al.
2004In Astronomy and Astrophysics, 427 (3), p. 21-L24
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Keywords :
gamma rays : observations; X rays : ISM : supernova remnants; individual : G78.2+2.1 (gamma-Cygni); radiation mechanisms : nonthermal; cosmic rays
Abstract :
[en] Spatially resolved images of the galactic supernova remnant G78.2+2.1 (gamma-Cygni) in hard X-ray energy bands from 25 keV to 120 keV are obtained with the IBIS-ISGRI imager aboard the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The images are dominated by localized clumps of about ten arcmin in size. The flux of the most prominent North-Western (NW) clump is (1.7+/-0.4)x10(-11) erg cm(-2) s(-1) in the 25-40 keV band. The observed X-ray fluxes are in agreement with extrapolations of soft X-ray imaging observations of gamma-Cyg by ASCA GIS and spatially unresolved RXTE PCA data. The positions of the hard X-ray clumps correlate with bright patches of optical line emission, possibly indicating the presence of radiative shock waves in a shocked cloud. The observed spatial structure and spectra are consistent with model predictions of hard X-ray emission from nonthermal electrons accelerated by a radiative shock in a supernova interacting with an interstellar cloud, but the powerful stellar wind of the O9V star HD 193322 is a plausible candidate for the NW source as well.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bykov, A. M.
Krassilchtchikov, A. M.
Uvarov, Y. A.
Bloemen, H.
Chevalier, R. A.
Gustov, M. Y.
Hermsen, W.
Lebrun, F.
Lozinskaya, T. A.
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Smirnova, T. V.
Sturner, S. J.
Swings, Jean-Pierre ;  Université de Liège - ULiège > Département d'astrophys.
Terrier, R.
Toptygin, I. N.
More authors (5 more) Less
Language :
English
Title :
Hard X-ray emission clumps in the gamma-Cygni supernova remnant: An INTEGRAL-ISGRI view
Publication date :
December 2004
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
E D P Sciences, Les Ulis Cedex A, France
Volume :
427
Issue :
3
Pages :
L21-L24
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 31 July 2009

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