Query : 2022A&A...659L...6K

2022A&A...659L...6K - Astronomy and Astrophysics, volume 659, L6-6 (2022/3-1)

The effect of viewing angle on the Kennicutt-Schmidt relation of the local molecular clouds.


Abstract (from CDS):

The Gaia data give us an unprecedented view to the three-dimensional (3D) structure of molecular clouds in the solar neighbourhood. We study how the projected areas and masses of clouds, and consequently the Kennicutt-Schmidt (KS) relation, depend on the viewing angle. We derive the probability distributions of the projected areas and masses for nine clouds within 400 pc of the Sun using 3D dust distribution data from the literature. We find that the viewing angle can have a dramatic effect on the observed areas and masses of individual clouds. The joint probability distributions of the areas and masses are strongly correlated, relatively flat, and can show multiple peaks. The typical ranges and 50% quartiles of the distributions are roughly 100-200% and 20-80% of the median value, respectively, making viewing angle effects important for all individual clouds. The threshold value used to define the cloud areas is also important; our analysis suggests that the clouds become more anisotropic for smaller thresholds (larger scales). On average, the areas and masses of the plane-of-the-sky and face-on projections agree, albeit with a large scatter. This suggests that sample averages of areas and masses are relatively free of viewing angle effects, which is important to facilitate comparisons of extragalactic and Galactic data. Ultimately, our results demonstrate that a cloud's location in the KS relation is affected by the viewing angle in a non-trivial manner. However, the KS relation of our sample as a whole is not strongly affected by these effects, because the covariance of the areas and masses causes the observed mean column density to remain relatively constant.

Abstract Copyright: © ESO 2022

Journal keyword(s): ISM: clouds - ISM: structure - stars: formation

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1311 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4248 0
3 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1065 1
4 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 787 0
5 NAME Musca Cld 12 23 -71.3           ~ 213 0
6 NAME Lupus Complex SFR 16 03 -38.1           ~ 689 0
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3532 1
8 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 391 1
9 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 475 0
10 NAME Cepheus Cloud SFR 22 00.0 +76 30           ~ 139 0

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