| Canonical Name: | SNR G349.7+00.2 |
| TeVCat Name: | TeV J1718-374 |
| Other Names: | HESS J1718-374 |
| Source Type: | SNR/Molec. Cloud |
| R.A.: | 17 17 57.8 (hh mm ss) |
| Dec.: | -37 26 39.6 (dd mm ss) |
| Gal Long: | 349.72 (deg) |
| Gal Lat: | 0.17 (deg) |
| Distance: | 11.5 kpc |
| Flux: | 0.007 (Crab Units) |
| Energy Threshold: | 400 GeV |
| Spectral Index: | 2.8 |
| Extended: | No |
| Discovery Date: | 2013-07 |
| Discovered By: | H.E.S.S. |
| TeVCat SubCat: | Default Catalog |
Source Notes:
| H.E.S.S. Galactic Plane Survey (HGPS, 2018): |
| A selection of information for each of the 78 sources in the HGPS is provided in TeVCat. For full details, visit the HGPS website. |
| Name: | HESS J1718-374 |
| Source Class: | SNR |
| Identified Object: | G349.7+0.2 |
| R.A. (J2000): | 259.49 deg (17 17 57) |
| Dec. (J2000): | -37.44 deg (-37 26 39) |
| Positional uncertainty: | 0.007 deg |
| Spatial Model: | Point-Like |
| Size: | N/A |
| Spectral Model: | power law |
| Integral Flux > 1 TeV: | 1.25e-13 +/- 3.74e-14 cm-2 s-1 |
| Pivot Energy, E0: | 1.00 TeV |
| Diff. Flux at E0: | 2.25e-13 +/- 4.39e-14 cm-2 s-1 TeV-1 |
| Spectral Index: | 2.80 +/- 0.27 |
| HGPS Source Notes: | |
| | |
"This is one of the fourteen EXTERN sources in the HGPS catalog, i.e., VHE sources in the HGPS region previously detected by H.E.S.S. that were not reanalyzed
in the paper:"
- HESS J1718−374 was " previously detected toward the SNR G349.7+0.2. It is thought to result from interactions with molecular clouds and exhibit correspondingly steep (soft)
spectrum, which has PL index of 2.80 +/- 0.27 (H.E.S.S. Collaboration 2015). The energy threshold
of the analyse is therefore key to detecting this source. As described in
the HGPS paper, the maps that serve as a starting point for the source catalog have been produced
using the hard cuts configuration and a conservative safe energy threshold,
explaining the lack of detection of this source in the HGPS analysis."
This is one of the 31 firmly-identified objects among the HGPS sources. Two possible associations are listed in Table A.9. "This is a
list of astronomical objects, extracted from catalogs of plausible counterparts, which are are found to be spatially coincident with the HGPS source":
- G349.7+0.2 (SNR)
- 3FGL J1718.0−3726 (3FGL)
Source position and its uncertainty:
From
H.E.S.S. Collaboration (2014):
- R.A.: (J2000): 17 17 57.8 +/- 2.0s (stat) +/- 1.3s (syst)
- Dec.: (J2000): -37 26 39.6 +/- 24" (stat) +/- 20.0" (syst)
Source Extent:
From
H.E.S.S. Collaboration (2014):
- "An upper limit on the source extent of 0.04 deg (95% confidence
level, CL), larger than the SNR size seen in radio and X-rays, is
obtained based on the log-likelihood method profile.
Distance
From
H.E.S.S. Collaboration (2014):
- 11.5 kpc
- "one of the farthest Galactic SNR ever detected in this (TeV) domaine"
Spectral Properties:
From
H.E.S.S. Collaboration (2014):
- Spectral index: 2.8 +/- 0.27 (stat) +/- 0.20 (syst)
Flux:
From
H.E.S.S. Collaboration (2014):
- ~0.7% that of the Crab Nebula above the same energy threshold (400GeV)
Seen by: H.E.S.S.
-
Investigating the morphology of the supernova remnant G349.7+00.2 in the medium with a density gradient
Yan, Jing-Wen et al., arXiv e-prints parXiv:2004.06992 (2020) [LINK]
-
Searching for Overionized Plasma in the Gamma-ray Emitting Supernova Remnant G349.7+0.2
Ergin, T. et al., ArXiv e-prints p (2015) [LINK]
-
SNR G349.7+0.2: A gamma-ray source in the far 3 kpc arm of the Galactic center
Tian, W.W. and Leahy, D.A, ArXiv e-prints p (2014) [LINK]
-
H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud
H.E.S.S. Collaboration, ArXiv e-prints p (2014) [LINK]
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