TeV Gamma-Rays from Old Supernova Remnants
Search this article
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
-
- Monthly Notices of the Royal Astronomical Society
-
Monthly Notices of the Royal Astronomical Society 371 (4), 1975-1982, 2006-10
Blackwell Publishing Ltd
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1050859215941168256
-
- NII Article ID
- 120000878156
-
- NII Book ID
- AA10528285
-
- Text Lang
- en
-
- Article Type
- journal article
-
- Data Source
-
- IRDB
- CiNii Articles