Journal Article PUBDB-2016-00390

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png
H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud

 ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;

2015
EDP Sciences Les Ulis

Astronomy and astrophysics 574, A100 - () [10.1051/0004-6361/201425070]
 GO

This record in other databases:        

Please use a persistent id in citations: doi:

Abstract: G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE; 0.1 GeV <E< 100 GeV) $\gamma$-rays. Radio and infrared observations indicate that the remnant is interacting with a molecular cloud. In this paper, the detection of very high energy (VHE, E> 100 GeV) $\gamma$-ray emission coincident with this SNR with the High Energy Stereoscopic System (H.E.S.S.) is reported. This makes it one of the farthest Galactic SNR ever detected in this domain. An integral flux F(E> 400 GeV) = (6.5 $\pm$ 1.1$_{stat}$ $\pm$ 1.3$_{syst}$) × $10^{−13} ph cm^{−2} s^{−1}$ corresponding to ~0.7% of that of the Crab Nebula and to a luminosity of $~10^{34}$ erg $s^{−1}$ above the same energy threshold, and a steep photon index $Γ_{VHE}$ = 2.8 $\pm$ 0.27$_{stat}$ $\pm$ $0.20_{syst}$ are measured. The analysis of more than 5 yr of Fermi-LAT data towards this source shows a power-law like spectrum with a best-fit photon index $Γ_{HE}$ = 2.2 $\pm$ 0.04$_{stat}$$^{+0.13}_{−0.31}$ $_{sys}$. The combined $\gamma$-ray spectrum of G349.7+0.2 can be described by either a broken power-law (BPL) or a power-law with exponential (or sub-exponential) cutoff (PLC). In the former case, the photon break energy is found at $E_{br, \gamma}$ = $55^{+70}_{−30}$ GeV, slightly higher than what is usually observed in the HE/VHE $\gamma$-ray emitting middle-aged SNRs known to be interacting with molecular clouds. In the latter case, the exponential (respectively sub-exponential) cutoff energy is measured at $E_{cut,\gamma}$ = $1.4^{+1.6}_{−0.55}$ (respectively $0.35^{+0.75}_{−0.21}$) TeV. A pion-decay process resulting from the interaction of the accelerated protons and nuclei with the dense surrounding medium is clearly the preferred scenario to explain the $\gamma$-ray emission. The BPL with a spectral steepening of 0.5−1 and the PLC provide equally good fits to the data. The product of the average gas density and the total energy content of accelerated protons and nuclei amounts to $\mathit{n}_{H}\mathit{W}_{p}$ ~ 5 × $10^{51}$ erg cm$^{−3}$.

Classification:

Note: (c) ESO. This article has an erratum (DOI 10.1051/0004-6361/201425070e). The arXiv version includes the changes of the erratum.

Contributing Institute(s):
  1. Astroteilchenphysik (ZEU-EXP/AT)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)
  2. P-WIND - New light on the gamma-ray sky: unveiling cosmic-ray accelerators in the Milky Way and their relation to pulsar wind nebulae (259391) (259391)
Experiment(s):
  1. Measurement at external facility

Appears in the scientific report 2015
Database coverage:
Medline ; OpenAccess ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
Click to display QR Code for this record

The record appears in these collections:
Private Collections > >DESY > >ZEUTHEN > ZEU-EXP/AT
Document types > Articles > Journal Article
Public records
Publications database
OpenAccess

 Record created 2016-01-15, last modified 2025-07-30