2022A&A...663A..82G


Query : 2022A&A...663A..82G

2022A&A...663A..82G - Astronomy and Astrophysics, volume 663A, 82-82 (2022/7-1)

Widespread subsonic turbulence in Ophiuchus North 1.

GONG Y., LIU S., WANG J., ZHU W., LI G.-X., YANG W. and SUN J.

Abstract (from CDS):


Context. Supersonic motions are common in molecular clouds. (Sub)sonic turbulence is usually detected toward dense cores and filaments. However, it remains unknown whether (sub)sonic motions at larger scales (≳1 pc) may be present in various environments.
Aims. Located at a distance of about 110 pc, Ophiuchus North 1 (Oph N1) is one of the nearest molecular clouds that would allow for an in-depth investigation of its turbulence properties via large-scale mapping observations of single-dish telescopes.
Methods. We carried out the 12CO (J = 1-0) and C18O (J = 1-0) imaging observations toward Oph N1 with the Purple Mountain Observatory 13.7 m telescope. The observations have an angular resolution of ∼55'' (i.e., 0.03 pc).
Results. Most of the whole C18O emitting regions have Mach numbers of ≤1, demonstrating the large-scale (sub)sonic turbulence across Oph N1. Based on the polarization measurements, we estimate the magnetic field strength of the plane-of-sky component to be ≳9 uG. We infer that Oph N1 is globally sub-Alfvenic, and is supported against gravity mainly by the magnetic field. The steep velocity structure function can be caused by the expansion of the Sh 2-27 HII region or the dissipative range of incompressible turbulence.
Conclusions. Our observations reveal a surprising case of clouds that are characterized by widespread subsonic turbulence and a steep relation between the size and the linewidth. This cloud is magnetized where ion-neutral friction is assumed to play an important role.

Abstract Copyright: © Y. Gong et al. 2022

Journal keyword(s): ISM: clouds - radio lines: ISM - ISM: individual objects: OphN1 - ISM: kinematics and dynamics - ISM: molecules - ISM: structure

Errata: erratum vol. 676, art. C4 (2023)

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4412 0
2 LDN 1517 DNe 04 55 45 +30 33.0           ~ 122 0
3 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 262 0
4 NAME Musca Cld 12 23 -71.3           ~ 221 0
5 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3625 1
6 LBN 006.00+24.73 HII 16 35 56.8 -12 43 05           ~ 62 0
7 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1839 0
8 [VRC2001] L260 SMM 1 smm 16 46 58.1 -09 35 18           ~ 3 0
9 LDN 260 DNe 16 46 58.2 -09 36 20           ~ 43 0
10 PLCKECC G008.67+22.14 cor 16 47 07.8 -09 35 50           ~ 5 0
11 JCMTSF J164709.2-093501 smm 16 47 09.0 -09 35 05           ~ 5 0
12 LDN 204 DNe 16 47 47.3 -12 05 16           ~ 54 0
13 PLCKECC G008.52+21.84 cor 16 47 48.5 -09 53 10           ~ 4 0
14 LDN 234E DNe 16 48 04.5 -10 56 58           ~ 26 0
15 NAME Gould Belt PoG ~ ~           ~ 872 1

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