Astrophys. J., 637, 860-868 (2006/February-1)
Observations of global and local infall in NGC 1333.
WALSH A.J., BOURKE T.L. and MYERS P.C.
Abstract (from CDS):
We report ``infall asymmetry'' in the HCO+(1-0) and (3-2) lines toward NGC 1333, extended over ∼0.39 pc2, a larger extent than has been reported before for any star-forming region. The infall asymmetry extends over a major portion of the star-forming complex, and is not limited to a single protostar, a single dense core, or a single spectral line. It seems likely that the infall asymmetry represents inward motions, and that these motions are physically associated with the complex. Both blue-asymmetric and red-asymmetric lines are seen, but in both the (3-2) and (1-0) lines of HCO+ the vast majority of the asymmetric lines are blue, indicating inward motions. The (3-2) line, tracing denser gas, has the spectra with the strongest asymmetry; these spectra are associated with the protostars IRAS 4A and 4B, which most likely indicates that a warm central source is affecting the line profiles. The (3-2) and (1-0) lines usually have the same sense of asymmetry in common positions, but their profiles differ significantly, and the (1-0) line appears to trace motions on much larger spatial scales than does the (3-2) line. Line profile models fit the spectra well, but do not strongly constrain their parameters. The mass accretion rate of the inward motions is of order 10–4 M☉/yr1, similar to the ratio of stellar mass to cluster age.
ISM: Clouds - ISM: Kinematics and Dynamics - Stars: Formation
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