Turbulence in Class 0 and Class I protostellar envelopes

Details Turbulence in Class 0 and Class I protostellar envelopes Turbulence in Class 0 and Class I protostellar envelopes

2004-12-09

arxiv.org/abs/astro-ph/0412219v1

Mon.Not.Roy.Astron.Soc. 357 (2005) 687-690

Astronomy and Astrophysics

Astrophysics

5 pages

Scientific paper

10.1111/j.1365-2966.2005.08680.x

We estimate the levels of turbulence in the envelopes of Class 0 and I protostars using a model based on measurements of the peak separation of double-peaked asymmetric line profiles. We use observations of 20 protostars of both Class 0 and I taken in the HCO+ (J=3-2) line that show the classic double-peaked profile. We find that some Class 0 sources show high levels of turbulence whilst others demonstrate much lower levels. In Class I protostars we find predominantly low levels of turbulence. The observations are consistent with a scenario in which Class 0 protostars form in a variety of environments and subsequently evolve into Class I protostars. The data do not appear to be consistent with a recently proposed scenario in which Class 0 protostars can only form in extreme environments.

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