2004A&A...427L..21B


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET02:42:18

2004A&A...427L..21B - Astronomy and Astrophysics, volume 427, L21-24 (2004/12-1)

Hard X-ray emission clumps in the γ-Cygni supernova remnant: An INTEGRAL-ISGRI view.

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 G., SMIRNOVA T.V., STURNER S.J., SWINGS J.-P., TERRIER R. and TOPTYGIN I.N.

Abstract (from CDS):

Spatially resolved images of the galactic supernova remnant G78.2+2.1 (γ-Cygni) in hard X-ray energy bands from 25keV to 120keV 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)x10–11erg/cm2/s in the 25-40keV band. The observed X-ray fluxes are in agreement with extrapolations of soft X-ray imaging observations of γ-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.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - X rays: ISM: supernova remnants - individual: G78.2+2.1 (γ-Cygni) - radiation mechanisms: nonthermal - cosmic rays

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 443 SNR 06 18 02.7 +22 39 36     10.11     ~ 1120 1
2 SNR G347.3-00.5 SNR 17 12 27 -39 41.2     12.27     ~ 630 1
3 HD 193322 ** 20 18 06.98820 +40 43 55.5001 5.17 5.94 5.84 5.69 5.68 O9IV(n)+B1.5V 269 0
4 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 203 2
5 GRO J2019+40 gam 20 21.5 +40 26           ~ 126 1
6 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 209 2
7 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 819 0

    Equat.    Gal    SGal    Ecl

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