2003A&A...412..417P


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST07:41:39

2003A&A...412..417P - Astronomy and Astrophysics, volume 412, 417-430 (2003/12-3)

Non-Gaussian velocity shears in the environment of low mass dense cores.

PETY J. and FALGARONE E.

Abstract (from CDS):

We report on a novel kind of small scale structure in molecular clouds found in IRAM-30m and CSO maps of 12CO and 13CO lines around low mass starless dense cores. These structures come to light as the locus of the extrema of velocity shears in the maps, computed as the increments at small scale (∼0.02pc) of the line velocity centroids. These extrema populate the non-Gaussian wings of the shear probability distribution function (shear-PDF) built for each map. They form elongated structures of variable thickness, ranging from less than 0.02pc for those unresolved, up to 0.08pc. They are essentially pure velocity structures. We propose that these small scale structures of velocity shear extrema trace the locations of enhanced dissipation in interstellar turbulence. In this picture, we find that a significant fraction of the turbulent energy present in the field would be dissipating in structures filling less than a few % of the cloud volume.

Abstract Copyright:

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

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Polaris Cirrus Cloud MoC 01 52 29.6 +87 40 31           ~ 71 0
2 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
3 LDN 1495 DNe 04 18.1 +27 37           ~ 294 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3505 0
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1363 0
6 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 160 0
7 HH 83 HH 05 33 32.52 -06 29 46.9           ~ 63 0
8 LDN 1689B DNe 16 34 42.1 -24 36 11           ~ 139 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-07:41:39

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