Journal
ASTROPHYSICAL JOURNAL
Volume 740, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/740/1/45
Keywords
ISM: kinematics and dynamics; ISM: molecules; radio lines: ISM; stars: formation
Categories
Funding
- states of Illinois, California, and Maryland
- James S. McDonnell Foundation
- Gordon and Betty Moore Foundation
- Kenneth T. and Eileen L. Norris Foundation
- University of Chicago
- Associates of the California Institute of Technology
- National Science Foundation
- CARMA partner universities
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
- University of Michigan [HST-GO-11548.04-A]
- Spitzer archival research program [50668]
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We present a study of dense molecular gas kinematics in 17 nearby protostellar systems using single-dish and interferometric molecular line observations. The non-axisymmetric envelopes around a sample of Class 0/I protostars were mapped in the N2H+ (J = 1 -> 0) tracer with the IRAM 30 m, CARMA, and Plateau de Bure Interferometer, as well as NH3 (1,1) with the Very Large Array. The molecular line emission is used to construct line-center velocity and linewidth maps for all sources to examine the kinematic structure in the envelopes on spatial scales from 0.1 pc to similar to 1000AU. The direction of the large-scale velocity gradients from single-dish mapping is within 45 degrees of normal to the outflow axis in more than half the sample. Furthermore, the velocity gradients are often quite substantial, the average being similar to 2.3 kms(-1) pc(-1). The interferometric data often reveal small-scale velocity structure, departing from the more gradual large-scale velocity gradients. In some cases, this likely indicates accelerating infall and/or rotational spin-up in the inner envelope; the median velocity gradient from the interferometric data is similar to 10.7 kms(-1) pc(-1). In two systems, we detect high-velocity HCO+ (J = 1 -> 0) emission inside the highest-velocity N2H+ emission. This enables us to study the infall and rotation close to the disk and estimate the central object masses. The velocity fields observed on large and small scales are more complex than would be expected from rotation alone, suggesting that complex envelope structure enables other dynamical processes (i.e., infall) to affect the velocity field.
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