CARMA Large Area Star Formation Survey: Structure and Kinematics of Dense Gas in Serpens Main
Creators
- Lee, Katherine I.1, 2
- Fernández-López, Manuel2, 3
-
Storm, Shaye1
- Looney, Leslie W.2
- Mundy, Lee G.1
- Segura-Cox, Dominique2
- Teuben, Peter1
-
Rosolowsky, Erik4, 5
-
Arce, Héctor G.6
- Ostriker, Eve C.7
- Shirley, Yancy L.8
- Kwon, Woojin9
- Kauffmann, Jens10
-
Tobin, John J.11
- Plunkett, Adele L.6
- Pound, Marc W.1
- Salter, Demerese M.1
- Volgenau, N. H.12
- Chen, Che-Yu1
-
Tassis, Konstantinos13, 14
-
Isella, Andrea12
- Crutcher, Richard M.2
- Gammie, Charles F.2
-
Testi, Leonardo15
-
1.
University of Maryland, College Park
-
2.
University of Illinois Urbana-Champaign
-
3.
Instituto Argentino de Radioastronomía
-
4.
University of British Columbia
-
5.
University of Alberta
-
6.
Yale University
-
7.
Princeton University
-
8.
University of Arizona
-
9.
Netherlands Institute for Space Research
-
10.
Max Planck Institute for Radio Astronomy
-
11.
National Radio Astronomy Observatory
-
12.
California Institute of Technology
-
13.
University of Crete
-
14.
Foundation for Research and Technology Hellas
-
15.
European Southern Observatory
Abstract
We present observations of NL_2H^+ (J = 1 -> 0), HCO^+ (J = 1 -> 0), and HCN (J = 1 -> 0) toward the Serpens Main molecular cloud from the CARMA Large Area Star Formation Survey (CLASSy). We mapped 150 arcmin(2) of Serpens Main with an angular resolution of ~7". The gas emission is concentrated in two subclusters (the NW and SE subclusters). The SE subcluster has more prominent filamentary structures and more complicated kinematics compared to the NW subcluster. The majority of gas in the two subclusters has subsonic to sonic velocity dispersions. We applied a dendrogram technique with N_2H^+(1-0) to study the gas structures; the SE subcluster has a higher degree of hierarchy than the NW subcluster. Combining the dendrogram and line fitting analyses reveals two distinct relations: a flat relation between nonthermal velocity dispersion and size, and a positive correlation between variation in velocity centroids and size. The two relations imply a characteristic depth of 0.15 pc for the cloud. Furthermore, we have identified six filaments in the SE subcluster. These filaments have lengths of ~0.2 pc and widths of ~0.03 pc, which is smaller than a characteristic width of 0.1 pc suggested by Herschel observations. The filaments can be classified into two types based on their properties. The first type, located in the northeast of the SE subcluster, has larger velocity gradients, smaller masses, and nearly critical mass-per-unit-length ratios. The other type, located in the southwest of the SE subcluster, has the opposite properties. Several YSOs are formed along two filaments which have supercritical mass per unit length ratios, while filaments with nearly critical massper- unit-length ratios are not associated with YSOs, suggesting that stars are formed on gravitationally unstable filaments.
Additional Information
© 2014 American Astronomical Society. Received 2014 July 20; accepted 2014 October 7; published 2014 November 26. We thank the anonymous referee for valuable comments to improve the paper. CLASSy was supported by AST-1139950 (University of Illinois) and AST-1139998 (University of Maryland). Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of Illinois, California, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA consortium universities.Attached Files
Published - 0004-637X_797_2_76.pdf
Submitted - 1410.3514v1.pdf
Files
0004-637X_797_2_76.pdf
Additional details
Identifiers
- Eprint ID
- 53774
- Resolver ID
- CaltechAUTHORS:20150115-103442804
Related works
- Describes
- http://arxiv.org/abs/1410.3514 (URL)
Funding
- NSF
- AST-1139950
- NSF
- AST-1139998
- Gordon and Betty Moore Foundation
- Kenneth T. and Eileen L. Norris Foundation
- James S. McDonnell Foundation
- Caltech Associates
- University of Chicago
- states of California, Illinois, and Maryland
- CARMA consorutim universities
Dates
- Created
-
2015-01-15Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field