Abstract
We present a multitransition study in the 13CO(1-0), 12CO(2-1), 12CO(3-2) and 12CO(4-3) lines of a parsec scale elongated structure connected to a low-mass dense core. Densities larger than n H 2 = 104 cm−3 are inferred in the central regions of this structure, supporting the proposition that it is a genuine filament denser than its environment. The sharp observed drop of the 12CO and 13CO emissions requires a power law density fall-off steeper than r −1 although a single density law cannot reproduce the spatial shift of 0.1 pc between the 13CO and 12CO drops. Our results support the previous proposition that this elongated structure is a filament threaded by helical magnetic fields, channeling the gas inflow onto the dense core.
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Hily-Blant, P., Falgarone, E., Pineau des Forêts, G. et al. A Molecular Filament Threaded by Helical Magnetic Fields?. Astrophysics and Space Science 292, 285–289 (2004). https://doi.org/10.1023/B:ASTR.0000045029.17637.3b
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DOI: https://doi.org/10.1023/B:ASTR.0000045029.17637.3b