Query : 2006A&A...457..197S

2006A&A...457..197S - Astronomy and Astrophysics, volume 457, 197-206 (2006/10-1)

Random flows and diagnostics of turbulence in the high latitude cirrus.


Abstract (from CDS):

We present an analysis of the exceptionally turbulent velocity field in the high Galactic latitude cirrus cloud MBM 3. As in the other translucent clouds in our study (MBM 16 and MBM 40), there is no evidence for internal star formation. However, the large scale velocity variation in this cloud is more pronounced. We have mapped the cloud in 12CO and 13CO (1-0) at high spatial (0.03pc) and velocity (0.06km/s) resolution. We constructed several velocity probability density functions (PDFs), estimated the turbulent transfer rate, and analyzed the linewidths as a function of the size of randomly chosen regions within the cloud. We find strong shear flows throughout the cloud that can easily power the turbulent motions. The wings of the PDFs are well approximated by a lorentzian distribution. Such distributions, related to Levy processes that are well known to be produced by correlated processes, are an unambiguous diagnostic of the turbulent intermittency.We find that the linewidth-size relation frequently used to indicate the role of turbulence in molecular clouds is not an unambiguous signature of its presence.

Abstract Copyright:

Journal keyword(s): turbulence - ISM: kinematics and dynamics - ISM: clouds - ISM: structure

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 [DB2002b] G131.28-45.68 MoC 01 15.8 +16 48           ~ 23 0
2 [DB2002b] G133.52-45.30 MoC 01 22.5 +16 56           ~ 17 0
3 MBM 16 MoC 03 19 04.1 +11 34 52           ~ 63 0
4 MBM 40 MoC 16 10 34 +21 49.3           ~ 70 0
5 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3535 1

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