Title:	Gamma rays from centaurus A
Authors:	Gupta, Nayantara
Issue Date:	Jun-2008
Publisher:	IOP Publishing and SISSA
Citation:	Journal of Cosmology and Astroparticle Physics, 2008, Vol.6, p022
Abstract:	Centaurus A, the cosmic ray accelerator a few Mpc away from us, is possibly one of the nearest sources of extremely high energy cosmic rays. We investigate whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be explained with only proton-proton interactions. We show that for a single power law proton spectrum, mechanisms of γ-ray production other than proton-proton interactions are needed inside this radio-galaxy to explain the gamma ray flux observed by EGRET, upper limits from HESS/CANGAROO-III and the correlated extremely energetic cosmic ray events observed by the Pierre Auger experiment. In future, with better γ-ray data, and simultaneous observation with γ-ray and cosmic ray detectors, it will be possible to carry out such studies on different sources in more detail.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4468
ISSN:	1475-7516 (Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2008JCAP...06..022G http://arxiv.org/abs/0804.3017 http://dx.doi.org/10.1088/1475-7516/2008/06/022
Copyright:	2008 IOP Publishing and SISSA
Appears in Collections:	Research Papers (A&A)

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