2016A&A...587A..97H


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST06:40:41

2016A&A...587A..97H - Astronomy and Astrophysics, volume 587A, 97-97 (2016/3-1)

The Musca cloud: A 6 pc-long velocity-coherent, sonic filament.

HACAR A., KAINULAINEN J., TAFALLA M., BEUTHER H. and ALVES J.

Abstract (from CDS):

Filaments play a central role in the molecular clouds' evolution, but their internal dynamical properties remain poorly characterized. To further explore the physical state of these structures, we have investigated the kinematic properties of the Musca cloud. We have sampled the main axis of this filamentary cloud in 13CO and C18O (2-1) lines using APEX observations. The different line profiles in Musca shows that this cloud presents a continuous and quiescent velocity field along its ∼6.5pc of length. With an internal gas kinematics dominated by thermal motions (i.e. σNT/cs≲1) and large-scale velocity gradients, these results reveal Musca as the longest velocity-coherent, sonic-like object identified so far in the interstellar medium. The transonic properties of Musca present a clear departure from the predicted supersonic velocity dispersions expected in the Larson's velocity dispersion-size relationship, and constitute the first observational evidence of a filament fully decoupled from the turbulent regime over multi-parsec scales.

Abstract Copyright:

Journal keyword(s): radio lines: ISM - ISM: clouds - ISM: kinematics and dynamics - ISM: molecules - ISM: structure

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 LDN 1495 DNe 04 18.1 +27 37           ~ 274 1
2 Barnard 213 DNe 04 20 51 +27 16.3           ~ 141 0
3 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3309 0
4 LDN 1517 DNe 04 55 45 +30 33.0           ~ 93 0
5 NAME Musca Filament PoC 10 54 -74.0           ~ 20 0
6 NAME Cha I MoC 11 06 48 -77 18.0           ~ 935 1
7 NAME Musca Cld 12 23 -71.3           ~ 149 0
8 [DB2002b] G301.57-7.83 DNe 12 35 16.6 -70 39 49           ~ 11 0
9 NAME Cha III MoC 12 37.8 -80 15           ~ 122 2
10 NAME Cha II MoC 12 54 -77.2           ~ 294 0
11 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2929 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-06:40:41

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