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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 282099.0, MPI für Kernphysik / High-Energy Astrophysics
Very high energy observations of the starburst galaxy NGC 253 with
Authors:Lemoine-Goumard, M.; Hinton, J. A.; Völk, Heinrich J.
Corporate body:J. Hinton for the H.E.S.S. Collaboration
Research Context:Gamma Ray Astronomy
Publisher:Tata Institute of Fundamental Research
Place of Publication:Navy Nagar, Colaba, Mumbai, MH-400005
Date of Publication (YYYY-MM-DD):2005-12
Title of Proceedings:Proceedings of the 29th International Cosmic Ray Conference
Start Page:283
End Page:286
Volume (in Series):10,4
Name of Conference/Meeting:29th International Cosmic Ray Conference
Place of Conference/Meeting:Pune, India
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present the result of 28 hours of observations of the nearby starburst galaxy NGC 253 with the H.E.S.S.Cherenkov telescopes in 2003. Gamma-ray emission above 400 GeV from NGC 253 was reported by the CANGAROO collaboration in 2002. We find no evidence for very high energy for very high energy gamma-ray emission from this object and we derive upper limits on the ux above 300 GeV of 1.9-12 photons cm-2 s-1 for a point-like source and 6.3 x 10 -12 photons cm
-2 s-1 for a source of size 0.5° as reported by CANGAROO, both at a condence level of 99%. These upper limits are inconsistent with the spectrum reported by CANGAROO. The expected very high energy gamma-ray emission from this object is discussed in the framework of a galactic wind prolongation model.
Free Keywords:Hess
External Publication Status:published
Document Type:Conference-Paper
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, F-91128 Palaiseau, France
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