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Article overview
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Observations of Global and Local Infall in NGC 1333 | | Andrew J. Walsh
; Tyler L. Bourke
; Philip C. Myers
; | | Date: |
4 Oct 2005 | | Subject: | astro-ph | | Abstract: | We report ``infall asymmetry’’ in the HCO$^+$ (1--0) and (3--2) lines toward NGC 1333, extended over $sim 0.39 {
m pc}^2$, a larger extent than has been reported be fore, 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, or to a single dense core, or to 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 and these spectra are associated with the protostars IRAS 4A and 4B, which most likely indicates 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$_odot$/yr, similar to the ratio of stellar mass to cluster age. | | Source: | arXiv, astro-ph/0510066 | | Services: | Forum | Review | PDF | Favorites | |
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