2013A&A...559A..34L


Query : 2013A&A...559A..34L

2013A&A...559A..34L - Astronomy and Astrophysics, volume 559A, 34-34 (2013/11-1)

A 500 pc filamentary gas wisp in the disk of the Milky Way.

LI G.-X., WYROWSKI F., MENTEN K. and BELLOCHE A.

Abstract (from CDS):

Star formation occurs in molecular gas. In previous studies, the structure of the molecular gas has been studied in terms of molecular clouds, but has been overlooked beyond the cloud scale. We present an observational study of the molecular gas at 49.5°<l<52.5° and -5.0km/s<vlsr<17.4km/s. The molecular gas is found in the form of a huge (>500pc) filamentary gas wisp. This has a large physical extent and a velocity dispersion of ∼5km/s. The eastern part of the filamentary gas wisp is located ∼130pc above the Galactic disk (which corresponds to 1.5-4 e-folding scale-heights), and the total mass of the gas wisp is >1x105M. It is composed of two molecular clouds and an expanding bubble. The velocity structure of the gas wisp can be explained as a smooth quiescent component disturbed by the expansion of a bubble. That the length of the gas wisp exceeds by much the thickness of the molecular disk of the Milky Way is consistent with the cloud-formation scenario in which the gas is cold prior to the formation of molecular clouds. Star formation in the filamentary gas wisp occurs at the edge of a bubble (G52L nebula), which is consistent with some models of triggered star formation.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: bubbles - ISM: kinematics and dynamics - stars: formation - turbulence

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 - 2023
#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1443 0
2 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4192 4
3 NAME Nessie Nebula DNe 16 43 -46.7           ~ 25 0
4 SNR G016.0-00.5 SNR 18 21.9 -15 14           ~ 19 0
5 GRSMC 51.69+0.74 MoC 19 23.9 +16 59           ~ 2 0
6 HRDS G052.201+00.752 HII 19 24 53.7 +17 26 15           ~ 3 0
7 IRAS 19227+1721 HII 19 25 00.0 +17 27 34           ~ 9 0
8 GRSMC 52.24+0.74 MoC 19 25.0 +17 28           ~ 2 0
9 HRDS G052.259+00.700 HII 19 25 12.1 +17 27 48           ~ 3 0
10 [BAB2012] G52L HII 19 25.3 +17 09           ~ 5 0
11 [BAB2012] G52 HII 19 25.3 +17 11           ~ 2 0

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2023.03.31-02:46:41

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