The Open UniversitySkip to content
 

The JCMT nearby galaxies legacy survey VI. The distribution of gas and star formation in M81

Sánchez-Gallego, J. R.; Knapen, J. H.; Heiner, J. S.; Wilson, C. D.; Warren, B. E.; Allen, R. J.; Azimlu, M.; Barmby, P.; Bendo, G. J.; Comerón, S.; Israel, F. P.; Serjeant, S.; Tilanus, R. P. J.; Vlahakis, C. and van der Werf, P. (2011). The JCMT nearby galaxies legacy survey VI. The distribution of gas and star formation in M81. Astronomy & Astrophysics, 527, article no. A16.

Full text available as:
[img]
Preview
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1640Kb)
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361/201014930
Google Scholar: Look up in Google Scholar

Abstract

We present the first complete 12CO J = 3−2 map of M 81, observed as part of the Nearby Galaxies Legacy Survey being carried out at the James Clerk Maxwell Telescope. We detect nine regions of significant CO emission located at different positions within the spiral arms, and confirm that the global CO emission in the galaxy is low. We combine these data with a new Hα map obtained using the Isaac Newton Telescope and archival H I, 24μm, and FUV images to uncover a correlation between the molecular gas and star forming regions in M 81. For the nine regions detected in CO J = 3−2, we combine our CO J = 3−2 data with existing CO J = 1−0 data to calculate line ratios. We find that the ratio J = (3−2)/(1−0) is in agreement with the range of typical values found in the literature (0.2−0.8). Making reasonable assumptions, this allows us to constrain the hydrogen density to the range (103 −104) cm-3. We also estimated the amount of hydrogen produced in photo-dissociation regions near the locations where CO J = 3−2 was detected.

Item Type: Journal Article
Copyright Holders: 2011 ESO
ISSN: 1432-0746
Extra Information: 10 pp.
Keywords: galaxies; star formation; Hii regions
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 28697
Depositing User: Astrid Peterkin
Date Deposited: 04 May 2011 15:27
Last Modified: 31 Jul 2014 18:06
URI: http://oro.open.ac.uk/id/eprint/28697
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk