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ID 17237
file
creator
Yamazaki, Ryo
Kohri, Kazunori
Bamba, Aya
Yoshida, Tatsuo
Tsuribe, Toru
Takahara, Fumio
subject
acceleration of particles - gamma-rays
theory - ISM
clouds - shock waves - supernova remnants - X-rays
ISM
NDC
Astronomy. Space sciences
abstract
We study the emission from an old supernova remnant (SNR) with an age of around 105 yrs and that from a giant molecular cloud (GMC) encountered by the SNR. When the SNR age is around 105 yrs, hadron acceleration is efficient enough to emit TeV γ-rays both at the shock of the SNR and that in the GMC. The maximum energy of primarily accelerated electrons is so small that TeV γ-rays and X-rays are dominated by hadronic processes, π 0-decay and synchrotron radiation from secondary electrons, respectively. However, if the SNR is older than several 105 yrs, there are few high-energy particles emitting TeV γ-rays because of the energy loss effect and/or the wave damping effect occurring at low-velocity isothermal shocks. It is found that the ratio of TeV γ-ray (1-10 TeV) to X-ray (2-10 keV) energy flux can be more than ~ 102. Such a source showing large flux ratio may be a possible origin of recently discovered unidentified TeV sources.
journal title
Monthly Notices of the Royal Astronomical Society
volume
Volume 371
issue
Issue 4
start page
1975
end page
1982
date of issued
2006-10
publisher
Blackwell Publishing Ltd
issn
0035-8711
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Blackwell Publishing. The definitive version is available at www.blackwell-synergy.com
relation is version of URL
http://dx.doi.org/10.1111/j.1365-2966.2006.10832.x
department
Graduate School of Science