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Detailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT

dc.contributor.authorHANABATA, Y.
dc.contributor.authorKATAGIRI, H.
dc.contributor.authorHEWITT, J.W.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorBALLET, Jean
dc.contributor.authorFUKAZAWA, Y.
dc.contributor.authorFUKUI, Y.
dc.contributor.authorHAYAKAWA, T.
hal.structure.identifierFERMI
dc.contributor.authorLEMOINE-GOUMARD, M.
hal.structure.identifierIEEC-CSIC
dc.contributor.authorPEDALETTI, G.
dc.contributor.authorW. STRONG, A.
dc.contributor.authorF. TORRES, D.
dc.contributor.authorYAMAZAKI, R.
dc.date.issued2014
dc.identifier.issn0004-637X
dc.description.abstractEnWe present a detailed investigation of the γ-ray emission in the vicinity of the supernova remnant (SNR) W28 (G6.4−0.1) observed by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. We detected significant γ-ray emission spatially coincident with TeV sources HESS J1800−240A, B, and C, located outside the radio boundary of the SNR. Their spectra in the 2-100 GeV band are consistent with the extrapolation of the power-law spectra of the TeV sources. We also identified a new source of GeV emission, dubbed Source W, which lies outside the boundary of TeV sources and coincides with radio emission from the western part of W28. All of the GeV γ-ray sources overlap with molecular clouds in the velocity range from 0 to 20 km s−1. Under the assumption that the γ-ray emission towards HESS J1800-240A, B, and C comes from π0 decay due to the interaction between the molecular clouds and cosmic rays (CRs) escaping from W28, they can be naturally explained by a single model in which the CR diffusion coefficient is smaller than the theoretical expectation in the interstellar space. The total energy of the CRs escaping from W28 is constrained through the same modeling to be larger than ∼ 2 × 1049 erg. The emission from Source W can also be explained with the same CR escape scenario.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.encceleration of particles
dc.subject.encosmic rays
dc.subject.endiffusion
dc.subject.engamma rays: ISM
dc.subject.enISM: supernova remnants Online-only material: color figures
dc.title.enDetailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/786/2/145
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.identifier.arxiv1403.6878
bordeaux.journalThe Astrophysical Journal
bordeaux.page145
bordeaux.volume786
bordeaux.peerReviewedoui
hal.identifierin2p3-01016760
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-01016760v1
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