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Title: Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1

Abstract

We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4 {+-} 0.6 (stat) {+-} 1.2 (sys) GeV, and photon indices of 2.10 {+-} 0.06 (stat) {+-} 0.10 (sys) below the break and 2.70 {+-} 0.12 (stat) {+-} 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of p0s produced by particles accelerated in the SNR and hitting the molecular clouds naturallymore » explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.« less

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1050861
Report Number(s):
SLAC-PUB-14997
Journal ID: ISSN 0004-637X; ASJOAB; arXiv:1109.3017; TRN: US1204676
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Astrophys.J.744:80,2012
Additional Journal Information:
Journal Volume: 744; Journal Issue: 1; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATION; CLOUDS; DECAY; DIFFUSION; EXTRAPOLATION; MORPHOLOGY; PHOTONS; SUPERNOVA REMNANTS; TELESCOPES; Astrophysics,ASTRO

Citation Formats

Ajello, M, Allafort, A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Baldini, L, /INFN, Pisa, Ballet, J, /AIM, Saclay, Barbiellini, G, /INFN, Trieste /Trieste U., Bastieri, D, /INFN, Padua /Padua U., Bechtol, K, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bellazzini, R, /INFN, Pisa, Berenji, B, Blandford, R D, Bloom, E D, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bonamente, E, /INFN, Perugia /Perugia U., Borgland, A W, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bregeon, J, /INFN, Pisa, Brigida, M, /Bari Polytechnic /INFN, Bari, Bruel, P, /Ecole Polytechnique, Buehler, R, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Buson, S, /INFN, Padua /Padua U., Caliandro, G A, /CSIC, Catalunya, Cameron, R A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Caraveo, P A, /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U., and /more authors. Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1. United States: N. p., 2012. Web. doi:10.1088/0004-637X/744/1/80.
Ajello, M, Allafort, A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Baldini, L, /INFN, Pisa, Ballet, J, /AIM, Saclay, Barbiellini, G, /INFN, Trieste /Trieste U., Bastieri, D, /INFN, Padua /Padua U., Bechtol, K, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bellazzini, R, /INFN, Pisa, Berenji, B, Blandford, R D, Bloom, E D, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bonamente, E, /INFN, Perugia /Perugia U., Borgland, A W, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bregeon, J, /INFN, Pisa, Brigida, M, /Bari Polytechnic /INFN, Bari, Bruel, P, /Ecole Polytechnique, Buehler, R, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Buson, S, /INFN, Padua /Padua U., Caliandro, G A, /CSIC, Catalunya, Cameron, R A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Caraveo, P A, /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U., & /more authors. Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1. United States. https://doi.org/10.1088/0004-637X/744/1/80
Ajello, M, Allafort, A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Baldini, L, /INFN, Pisa, Ballet, J, /AIM, Saclay, Barbiellini, G, /INFN, Trieste /Trieste U., Bastieri, D, /INFN, Padua /Padua U., Bechtol, K, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bellazzini, R, /INFN, Pisa, Berenji, B, Blandford, R D, Bloom, E D, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bonamente, E, /INFN, Perugia /Perugia U., Borgland, A W, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Bregeon, J, /INFN, Pisa, Brigida, M, /Bari Polytechnic /INFN, Bari, Bruel, P, /Ecole Polytechnique, Buehler, R, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Buson, S, /INFN, Padua /Padua U., Caliandro, G A, /CSIC, Catalunya, Cameron, R A, /Stanford U., HEPL /KIPAC, Menlo Park /SLAC, Caraveo, P A, /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U., and /more authors. 2012. "Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1". United States. https://doi.org/10.1088/0004-637X/744/1/80. https://www.osti.gov/servlets/purl/1050861.
@article{osti_1050861,
title = {Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1},
author = {Ajello, M and Allafort, A and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Baldini, L and /INFN, Pisa and Ballet, J and /AIM, Saclay and Barbiellini, G and /INFN, Trieste /Trieste U. and Bastieri, D and /INFN, Padua /Padua U. and Bechtol, K and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Bellazzini, R and /INFN, Pisa and Berenji, B and Blandford, R D and Bloom, E D and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Bonamente, E and /INFN, Perugia /Perugia U. and Borgland, A W and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Bregeon, J and /INFN, Pisa and Brigida, M and /Bari Polytechnic /INFN, Bari and Bruel, P and /Ecole Polytechnique and Buehler, R and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Buson, S and /INFN, Padua /Padua U. and Caliandro, G A and /CSIC, Catalunya and Cameron, R A and /Stanford U., HEPL /KIPAC, Menlo Park /SLAC and Caraveo, P A and /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U. and /more authors.},
abstractNote = {We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4 {+-} 0.6 (stat) {+-} 1.2 (sys) GeV, and photon indices of 2.10 {+-} 0.06 (stat) {+-} 0.10 (sys) below the break and 2.70 {+-} 0.12 (stat) {+-} 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of p0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.},
doi = {10.1088/0004-637X/744/1/80},
url = {https://www.osti.gov/biblio/1050861}, journal = {Astrophys.J.744:80,2012},
issn = {0004-637X},
number = 1,
volume = 744,
place = {United States},
year = {Fri Sep 14 00:00:00 EDT 2012},
month = {Fri Sep 14 00:00:00 EDT 2012}
}