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A new SNR with TeV shell-type morphology: HESS J1731-347
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2011, 531, pp.A81. ⟨10.1051/0004-6361/201016425⟩, Astronomy and Astrophysics-A&A, 2011, 531, pp.A81. ⟨10.1051/0004-6361/201016425⟩
- Publication Year :
- 2011
- Publisher :
- HAL CCSD, 2011.
-
Abstract
- The recent discovery of the radio shell-type supernova remnant (SNR), G353.6-0.7, in spatial coincidence with the unidentified TeV source HESS J1731-347 has motivated further observations of the source with the High Energy Stereoscopic System (H.E.S.S.) Cherenkov telescope array to test a possible association of the gamma-ray emission with the SNR. With a total of 59 hours of observation, representing about four times the initial exposure available in the discovery paper of HESS J1731-347, the gamma-ray morphology is investigated and compared with the radio morphology. An estimate of the distance is derived by comparing the interstellar absorption derived from X-rays and the one obtained from 12CO and HI observations. The deeper gamma-ray observation of the source has revealed a large shell-type structure with similar position and extension (r~0.25{\deg}) as the radio SNR, thus confirming their association. By accounting for the H.E.S.S. angular resolution and projection effects within a simple shell model, the radial profile is compatible with a thin, spatially unresolved, rim. Together with RX J1713.7-3946, RX J0852.0-4622 and SN 1006, HESS J1731-347 is now the fourth SNR with a significant shell morphology at TeV energies. The derived lower limit on the distance of the SNR of 3.2 kpc is used together with radio and X-ray data to discuss the possible origin of the gamma-ray emission, either via inverse Compton scattering of electrons or the decay of neutral pions resulting from proton-proton interaction.<br />Comment: 10 pages, 10 figures, accepted for publication in A&A
- Subjects :
- [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Electron
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Coincidence
Pion
cosmic rays
0103 physical sciences
Angular resolution
High Energy Stereoscopic System
Supernova remnant
010303 astronomy & astrophysics
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
010308 nuclear & particles physics
supernova remnants [ISM]
[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Compton scattering
Astronomy and Astrophysics
Cherenkov Telescope Array
Space and Planetary Science
astroparticle physics
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2011, 531, pp.A81. ⟨10.1051/0004-6361/201016425⟩, Astronomy and Astrophysics-A&A, 2011, 531, pp.A81. ⟨10.1051/0004-6361/201016425⟩
- Accession number :
- edsair.doi.dedup.....ce4057ccb033c2d07b99aa7cfcf8a543