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CARMA Large Area Star Formation Survey: Project Overview with Analysis of Dense Gas Structure and Kinematics in Barnard 1

Storm, Shaye and Mundy, Lee G. and Fernández-López, Manuel and Lee, Katherine I. and Looney, Leslie W. and Teuben, Peter and Rosolowsky, Erik and Arce, Héctor G. and Ostriker, Eve C. and Segura-Cox, Dominique M. and Pound, Marc W. and Salter, Demerese M. and Volgenau, Nikolaus H. and Shirley, Yancy L. and Chen, Che-Yu and Gong, Hao and Plunkett, Adele L. and Tobin, John J. and Kwon, Woojin and Isella, Andrea and Kauffmann, Jens and Tassis, Konstantinos and Crutcher, Richard M. and Gammie, Charles F. and Testi, Leonardo (2014) CARMA Large Area Star Formation Survey: Project Overview with Analysis of Dense Gas Structure and Kinematics in Barnard 1. Astrophysical Journal, 794 (2). Art. No. 165. ISSN 0004-637X.

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We present details of the CARMA Large Area Star Formation Survey (CLASSy), while focusing on observations of Barnard 1. CLASSy is a CARMA Key Project that spectrally imaged N_2H^+, HCO^+, and HCN (J = 1 → 0 transitions) across over 800 square arcminutes of the Perseus and Serpens Molecular Clouds. The observations have angular resolution near 7" and spectral resolution near 0.16 km s^(−1). We imaged ~150 square arcminutes of Barnard 1, focusing on the main core, and the B1 Ridge and clumps to its southwest. N_2H^+ shows the strongest emission, with morphology similar to cool dust in the region, while HCO^+ and HCN trace several molecular outflows from a collection of protostars in the main core. We identify a range of kinematic complexity, with N_2H^+ velocity dispersions ranging from ~0.05 to 0.50 km s^(−1) across the field. Simultaneous continuum mapping at 3 mm reveals six compact object detections, three of which are new detections. A new, non-binary dendrogram algorithm is used to analyze dense gas structures in the N2H+ position–position–velocity (PPV) cube. The projected sizes of dendrogram-identified structures range from about 0.01 to 0.34 pc. Size–linewidth relations using those structures show that non-thermal line-of-sight velocity dispersion varies weakly with projected size, while rms variation in the centroid velocity rises steeply with projected size. Comparing these relations, we propose that all dense gas structures in Barnard 1 have comparable depths into the sky, around 0.1–0.2 pc; this suggests that overdense, parsec-scale regions within molecular clouds are better described as flattened structures rather than spherical collections of gas. Science-ready PPV cubes for Barnard 1 molecular emission are available for download.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Storm, Shaye0000-0001-9401-1357
Rosolowsky, Erik0000-0002-5204-2259
Arce, Héctor G.0000-0001-5653-7817
Tobin, John J.0000-0002-6195-0152
Isella, Andrea0000-0001-8061-2207
Tassis, Konstantinos0000-0002-8831-2038
Testi, Leonardo0000-0003-1859-3070
Additional Information:© 2014 The American Astronomical Society. Received 2014 June 2; accepted 2014 August 23; published 2014 October 7. The authors thank all members of the CARMA staff that made these observations possible, and Alyssa Goodman for encouraging critiques that improved the paper. CLASSy was supported by NSF AST-1139998 (University of Maryland) and NSF 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. Facility: CARMA
Funding AgencyGrant Number
Subject Keywords:ISM: clouds; ISM: kinematics and dynamics; ISM: molecules; ISM: structure; stars: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20141114-091451478
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Official Citation:CARMA Large Area Star Formation Survey: Project Overview with Analysis of Dense Gas Structure and Kinematics in Barnard 1 Shaye Storm et al. 2014 ApJ 794 165
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51749
Deposited By: Jason Perez
Deposited On:14 Nov 2014 18:58
Last Modified:09 Mar 2020 13:19

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