| | |
| | |
Stat |
Members: 3645 Articles: 2'504'585 Articles rated: 2609
25 April 2024 |
|
| | | |
|
Article overview
| |
|
NICMOS Observations of Shocked H_2 in Orion | Sean W.J. Colgan
; A.S.B. Schultz
; M.J. Kaufman
; E.F. Erickson
; D.J. Hollenbach
; | Date: |
19 Sep 2007 | Abstract: | HST NICMOS narrowband images of the shocked molecular hydrogen emission in
OMC-1 are analyzed to reveal new information on the BN/KL outflow. The
outstanding morphological feature of this region is the array of molecular
hydrogen ’’fingers’’ emanating from the general vicinity of IRc2 and the
presence of several Herbig-Haro objects. The NICMOS images appear to resolve
individual shock fronts. This work is a more quantitative and detailed analysis
of our data from a previous paper (Schultz etal. 1999).
Line strengths for the H_2 1--0 S(4) plus 2--1 S(6) lines at 1.89 micron are
estimated from measurements with the Paschen_alpha continuum filter F190N at
1.90 micron, and continuum measurements at 1.66 and 2.15 micron. We compare the
observed H_2 line strengths and ratios of the 1.89 micron and 2.12 micron 1--0
S(1) lines with models for molecular cloud shock waves. Most of the data cannot
be fit by J-shocks, but are well matched by C-shocks with shock velocities in
the range of 20--45 km/s and preshock densities of 10^{4} - 10^{6} cm^{-3},
similiar to values obtained in larger beam studies which averaged over many
shocks. There is also some evidence that shocks with higher densities have
lower velocities. | Source: | arXiv, 0709.2939 | 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:
| |