|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Ammonia excitation imaging of shocked gas towards the W28 gamma-ray source HESS J1801-233 | | Nigel I. Maxted
; Phoebe de Wilt
; Gavin P. Rowell
; Brent P. Nicholas
; Michael. G. Burton
; Andrew Walsh
; Yasuo Fukui
; Akiko Kawamura
; | | Date: |
8 Jul 2016 | | Abstract: | We present 12 mm Mopra observations of the dense (>10^3 cm^-3 ) molecular gas
towards the north-east (NE) of the W28 supernova remnant (SNR). This cloud is
spatially well-matched to the TeV gamma-ray source HESS J1801-233 and is known
to be a SNR-molecular cloud interaction region. Shock-disruption is evident
from broad NH3 (1,1) spectral line-widths in regions towards the W28 SNR, while
strong detections of spatially-extended NH3(3,3), NH3(4,4) and NH3(6,6)
inversion emission towards the cloud strengthen the case for the existence of
high temperatures within the cloud. Velocity dispersion measurements and
NH3(n,n)/(1,1) ratio maps, where n=2, 3, 4 and 6, indicate that the source of
disruption is from the side of the cloud nearest to the W28 SNR, suggesting
that it is the source of cloud-disruption. Towards part of the cloud, the ratio
of ortho to para-NH3 is observed to exceed 2, suggesting gas-phase NH3
enrichment due to NH3 liberation from dust grain mantles. The measured NH3
abundance with respect to H2 is ~(1.2+/-0.5)*10^-9, which is not high, as might
be expected for a hot, dense molecular cloud enriched by sublimated
grain-surface molecules. The results are suggestive of NH3 sublimation and
destruction in this molecular cloud, which is likely to be interacting with the
W28 SNR shock. | | Source: | arXiv, 1607.3061 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER