| Issue |
A&A
Volume 432, Number 2, March III 2005
|
|
|---|---|---|
| Page(s) | L25 - L29 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:200500022 | |
| Published online | 02 March 2005 | |
Letter to the Editor
Very high energy gamma rays from the composite SNR G 0.9+0.1
1
Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany e-mail: Jim.Hinton@mpi-hd.mpg.de
2
Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
3
University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK
4
Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France
5
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
6
Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
7
Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
8
LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
9
Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
10
Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France
11
European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
12
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
13
Service d'Astrophysique, DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, France
14
Landessternwarte, Königstuhl, 69117 Heidelberg, Germany
15
Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
16
Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
17
Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France
18
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
19
Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
20
University of Namibia, Private Bag 13301, Windhoek, Namibia
Received:
15
December
2004
Accepted:
11
January
2005
Very high energy (>100 GeV) gamma-ray emission has been detected
for the first time from the
composite supernova remnant G 0.9+0.1 using the HESS instrument.
The source is detected with a significance of ≈
,
and a photon flux above 200 GeV of
(
cm-2 s-1,
making it one of the weakest sources ever detected at TeV energies.
The photon spectrum is compatible with a power law (
) with
photon index 
.
The gamma-ray emission appears to originate in the plerionic core of
the remnant, rather than the shell, and can be plausibly explained as
inverse Compton scattering of relativistic electrons.
Key words: ISM: supernova remnants / ISM: individual objects: G 0.9+0.1 / gamma-rays: observations
© ESO, 2005
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