White, Glenn J. and Phillips, J. P.
(1988).
![[img]](http://oro.open.ac.uk/style/images/fileicons/application_pdf.png)
|
PDF (Version of Record)
- Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (770kB) |
| URL: | http://adsabs.harvard.edu/abs/1988A%26A...197..253... |
|---|---|
| Google Scholar: | Look up in Google Scholar |
Abstract
The authors present 77 CO J = 2-1 spectra centred upon four areas about the periphery of the Orion nebula NGC 1976. These reveal evidence of extensive line splitting, with primary components at VLSR ~ 12 km s-1 and VLSR ~ 7 km s-1. The spatial structure of the regions responsible for these components appears to differ appreciably, and various arguments are outlined to suggest that two distinct segments of a single enveloping cloud are responsible; one to the rear of the H II region (VLSR ~ 7 km s-1), associated with various star formation zones, the other in front of NGC 1976, and responsible for localised foreground extinction. This contrasts with previous models, which have proposed compressive shock regions ahead of local ionisation fronts; an hypothesis which is shown not to be necessary, and may be inconsistent with the observed width and conformity of the line splitting zone.
| Item Type: | Journal Item |
|---|---|
| Copyright Holders: | 1988 European Southern Observatory |
| ISSN: | 1432-0746 |
| Keywords: | astronomical maps; astronomical spectroscopy; carbon monoxide; Orion nebula; forbidden transitions; HII regions; interstellar extinction; molecular clouds; star formation |
| Academic Unit/School: | Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM) |
| Item ID: | 33348 |
| Depositing User: | G. J. White |
| Date Deposited: | 18 Apr 2012 15:01 |
| Last Modified: | 07 Dec 2018 22:44 |
| URI: | http://oro.open.ac.uk/id/eprint/33348 |
| Share this page: |     |
Download history for this item
These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)