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Number of Authors: 111
2015 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 807, no 2, 169Article in journal (Refereed) Published
Abstract [en]

Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV gamma-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for gamma-ray emission in Fermi Large Area Telescope data in the energy range from 100 MeV to 300 GeV from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a gamma-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in gamma-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the gamma-ray luminosity and the ratio of gamma-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic gamma-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).

Place, publisher, year, edition, pages
2015. Vol. 807, no 2, 169
Keyword [en]
cosmic rays, gamma rays: general, methods: data analysis, supernovae: general
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-120057DOI: 10.1088/0004-637X/807/2/169ISI: 000358967000055OAI: diva2:850228
Available from: 2015-09-01 Created: 2015-09-01 Last updated: 2015-09-01Bibliographically approved

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Larsson, Stefan
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Department of PhysicsDepartment of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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