Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants

If supernova remnants (SNRs) are the site of cosmicray acceleration, the associated nuclear interactions should result in an observable flux of γ-rays for the nearest SNRs. Measurements of the TeV γ-ray flux from six nearby, radio-bright SNRs have been made with the Whipple Observatory imaging air Č...

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Guardado en:
Detalles Bibliográficos
Publicado: 1998
Materias:
Cosmic rays
Gamma-rays: observations
ISM: IC 443; γ Cyg SNR; W 44
SNRS
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v329_n2_p639_Buckley
http://hdl.handle.net/20.500.12110/paper_00046361_v329_n2_p639_Buckley
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v329_n2_p639_Buckley
record_format dspace
spelling paper:paper_00046361_v329_n2_p639_Buckley2023-06-08T14:27:20Z Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants Cosmic rays Gamma-rays: observations ISM: IC 443; γ Cyg SNR; W 44 SNRS If supernova remnants (SNRs) are the site of cosmicray acceleration, the associated nuclear interactions should result in an observable flux of γ-rays for the nearest SNRs. Measurements of the TeV γ-ray flux from six nearby, radio-bright SNRs have been made with the Whipple Observatory imaging air Čerenkov telescope over the period September 1993 to June 1996. No significant emission has been detected and upper limits on the >300 GeV flux are reported. Three of these SNRs (IC443, γ-Cygni and W44) are spatially coincident with low-latitude otherwise unidentified sources detected with the Energetic Gamma-Ray Experiment Telescope (EGRET). If the EGRET γ-ray fluxes result from cosmic-ray interactions then the EGRET and Whipple data are found to be collectively inconsistent with a cosmic-ray source spectrum flatter than ∼ E -2.4 . The Whipple upper limits for IC443 and γ-Cygni are also inconsistent with a priori predictions if these remnants are indeed expanding into regions where the average density of the interstellar medium is enhanced by the presence of molecular clouds. These data weaken the case for the simplest models of shock acceleration and energy dependent propagation of cosmic rays. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v329_n2_p639_Buckley http://hdl.handle.net/20.500.12110/paper_00046361_v329_n2_p639_Buckley
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmic rays
Gamma-rays: observations
ISM: IC 443; γ Cyg SNR; W 44
SNRS
spellingShingle Cosmic rays
Gamma-rays: observations
ISM: IC 443; γ Cyg SNR; W 44
SNRS
Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
topic_facet Cosmic rays
Gamma-rays: observations
ISM: IC 443; γ Cyg SNR; W 44
SNRS
description If supernova remnants (SNRs) are the site of cosmicray acceleration, the associated nuclear interactions should result in an observable flux of γ-rays for the nearest SNRs. Measurements of the TeV γ-ray flux from six nearby, radio-bright SNRs have been made with the Whipple Observatory imaging air Čerenkov telescope over the period September 1993 to June 1996. No significant emission has been detected and upper limits on the >300 GeV flux are reported. Three of these SNRs (IC443, γ-Cygni and W44) are spatially coincident with low-latitude otherwise unidentified sources detected with the Energetic Gamma-Ray Experiment Telescope (EGRET). If the EGRET γ-ray fluxes result from cosmic-ray interactions then the EGRET and Whipple data are found to be collectively inconsistent with a cosmic-ray source spectrum flatter than ∼ E -2.4 . The Whipple upper limits for IC443 and γ-Cygni are also inconsistent with a priori predictions if these remnants are indeed expanding into regions where the average density of the interstellar medium is enhanced by the presence of molecular clouds. These data weaken the case for the simplest models of shock acceleration and energy dependent propagation of cosmic rays.
title Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
title_short Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
title_full Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
title_fullStr Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
title_full_unstemmed Constraints on cosmic-ray origin from TeV gamma-ray observations of supernova remnants
title_sort constraints on cosmic-ray origin from tev gamma-ray observations of supernova remnants
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v329_n2_p639_Buckley
http://hdl.handle.net/20.500.12110/paper_00046361_v329_n2_p639_Buckley
_version_ 1768542483899219968

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