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CARMA Large Area Star Formation Survey: Observational Analysis of Filaments in the Serpens South Molecular Cloud

Fernández-López, M. and Arce, H. G. and Looney, L. and Mundy, L. G. and Storm, S. and Teuben, P. J. and Lee, K. and Segura-Cox, D. and Isella, A. and Tobin, J. J. and Rosolowsky, E. and Plunkett, A. and Kwon, W. and Kauffmann, J. and Ostriker, E. and Tassis, K. and Shirley, Y. L. and Pound, M. (2014) CARMA Large Area Star Formation Survey: Observational Analysis of Filaments in the Serpens South Molecular Cloud. Astrophysical Journal Letters, 790 (2). Art. No. L19. ISSN 2041-8205. doi:10.1088/2041-8205/790/2/L19. https://resolver.caltech.edu/CaltechAUTHORS:20140828-140227670

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Abstract

We present the N_2H^+ (J = 1 → 0) map of the Serpens South molecular cloud obtained as part of the CARMA Large Area Star Formation Survey. The observations cover 250 arcmin^2 and fully sample structures from 3000 AU to 3 pc with a velocity resolution of 0.16 km s^1, and they can be used to constrain the origin and evolution of molecular cloud filaments. The spatial distribution of the N_2H^+ emission is characterized by long filaments that resemble those observed in the dust continuum emission by Herschel. However, the gas filaments are typically narrower such that, in some cases, two or three quasi-parallel N_2H^+ filaments comprise a single observed dust continuum filament. The difference between the dust and gas filament widths casts doubt on Herschel ability to resolve the Serpens South filaments. Some molecular filaments show velocity gradients along their major axis, and two are characterized by a steep velocity gradient in the direction perpendicular to the filament axis. The observed velocity gradient along one of these filaments was previously postulated as evidence for mass infall toward the central cluster, but these kind of gradients can be interpreted as projection of large-scale turbulence.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/2041-8205/790/2/L19DOIArticle
http://iopscience.iop.org/2041-8205/790/2/L19/PublisherArticle
http://arxiv.org/abs/1407.0755arXivDiscussion Paper
ORCID:
AuthorORCID
Arce, H. G.0000-0001-5653-7817
Storm, S.0000-0001-9401-1357
Isella, A.0000-0001-8061-2207
Tobin, J. J.0000-0002-6195-0152
Rosolowsky, E.0000-0002-5204-2259
Tassis, K.0000-0002-8831-2038
Additional Information:© 2014 The American Astronomical Society. Received 2014 April 27; accepted 2014 July 1; published 2014 July 11. We thank all members of the CARMA staff that made these observations possible. CLASSy was supported by NSF grants AST-1139990 (University of Maryland) and AST-1139950 (University of Illinois). 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 partner universities.
Funders:
Funding AgencyGrant Number
NSFAST-1139990
NSFAST-1139950
Subject Keywords:ISM: clouds; ISM: individual objects (Serpens South); ISM: kinematics and dynamics; ISM: structure; stars: formation
Issue or Number:2
DOI:10.1088/2041-8205/790/2/L19
Record Number:CaltechAUTHORS:20140828-140227670
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140828-140227670
Official Citation:CARMA Large Area Star Formation Survey: Observational Analysis of Filaments in the Serpens South Molecular Cloud M. Fernández-López et al. 2014 ApJ 790 L19
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49028
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:29 Aug 2014 21:43
Last Modified:10 Nov 2021 18:39

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