Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 20, 2014 | Submitted + Published
Journal Article Open

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

Abstract

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.

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

Attached Files

Published - 0004-637X_794_2_165.pdf

Submitted - 1409.1233v1.pdf

Files

0004-637X_794_2_165.pdf
Files (11.5 MB)
Name Size Download all
md5:92934a636ae2c20dcc8203c7726e1fef
6.6 MB Preview Download
md5:04ce5e808ab43568852b94eea4d90dd0
4.9 MB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 18, 2023