Spectral cutoffs in EGRET gamma-ray sources

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dc.creatorReimer, O.
dc.creatorBertsch, D. L.
dc.date2001-08-22
dc.date.accessioned2026-07-07T01:59:42Z
dc.date.available2026-07-07T01:59:42Z
dc.descriptionThe EGRET instrument has measured detailed photon spectra between 30 MeV and 10 GeV, which are represented by means of single power-law fits for sources in the 3EG catalog. However, various sources show indications of spectral cutoffs at GeV energies, which are poorly represented by such simple fits. In the case of well exposed or bright EGRET sources, a description of spectral cutoffs with more complicated functional forms appears to be applicable. An application for such multicomponent fits should be seen in extrapolations beyond the energies accessible to EGRET, i.e. for detectability studies of low-threshold Imaging Atmospheric Cherenkov Telescopes (IACTs). In cases of unidentified gamma-ray sources positionally coincident with Supernova remnants, the spectral shape beyond power-law extrapolations might observationally explain why such prominent SNRs like gammaCygni, IC 443 and CTA1 have not been detected during several observation campaigns performed by IACTs over the last years.
dc.description4 pages, 8 eps-figures, Proc. of 27th Int. Cosmic Ray Conf. (Hamburg, 2001)
dc.identifierhttps://arxiv.org/abs/astro-ph/0108347
dc.identifierhttp://arxiv.org/abs/astro-ph/0108347
dc.identifierProc. 27th ICRC (Hamburg), 2001, pp.2546-2549
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3221
dc.subjectAstrophysics
dc.titleSpectral cutoffs in EGRET gamma-ray sources
dc.typetext

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