scholarly journals The Role of Magnetic Field in Molecular Cloud Formation and Evolution

2019 ◽  
Vol 6 ◽  
Author(s):  
Patrick Hennebelle ◽  
Shu-ichiro Inutsuka
Keyword(s):  
Magnetic Field ◽  
Molecular Cloud ◽  
Cloud Formation ◽  
Formation And Evolution

The role of magnetic field in the formation and evolution of filamentary molecular clouds

2018 ◽  
Vol 14 (A30) ◽  
pp. 100-100
Author(s):  
Shu-ichiro Inutsuka
Keyword(s):  
Magnetic Field ◽  
Star Formation ◽  
Molecular Cloud ◽  
Molecular Clouds ◽  
Mass Function ◽  
Convincing Evidence ◽  
Formation And Evolution ◽  
Cloud Cores ◽  
Compressed Layer

AbstractRecent observations have emphasized the importance of the formation and evolution of magnetized filamentary molecular clouds in the process of star formation. Theoretical and observational investigations have provided convincing evidence for the formation of molecular cloud cores by the gravitational fragmentation of filamentary molecular clouds. In this review we summarize our current understanding of various processes that are required in describing the filamentary molecular clouds. Especially we can explain a robust formation mechanism of filamentary molecular clouds in a shock compressed layer, which is in analogy to the making of “Sushi.” We also discuss the origin of the mass function of cores.

Observations of magnetic fields in star-forming clouds

2018 ◽  
Vol 14 (A30) ◽  
pp. 101-101
Author(s):  
Juan D. Soler
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Molecular Clouds ◽  
Spatial Scales ◽  
Cloud Formation ◽  
Star Forming ◽  
Formation And Evolution ◽  
Under Construction ◽  
The Magnetic Field

AbstractThis review examines observations of magnetic fields in molecular clouds, that is, at spatial scales ranging from tens to tenths of parsecs and densities up to hundreds of particles per cubic centimetre. I will briefly summarize the techniques for observing and mapping magnetic fields in molecular clouds. I will review important examples of observational results obtained using each technique and their implications for our understanding of the role of the magnetic field in molecular cloud formation and evolution. Finally, I will briefly discuss the prospects for advances in our observational capabilities with telescopes and instruments now beginning operation or under construction.

scholarly journals The Supershell-Molecular Cloud Connection in the Milky Way and Beyond

2012 ◽  
Vol 8 (S292) ◽  
pp. 83-86
Author(s):  
J. R. Dawson ◽  
N. M. McClure-Griffiths ◽  
Y. Fukui ◽  
J. Dickey ◽  
T. Wong ◽  
...  
Keyword(s):  
Molecular Cloud ◽  
Molecular Clouds ◽  
Large Scale ◽  
Milky Way ◽  
Observational Evidence ◽  
Cloud Formation ◽  
Stellar Feedback ◽  
The Relationship ◽  
Global Contribution

AbstractThe role of large-scale stellar feedback in the formation of molecular clouds has been investigated observationally by examining the relationship between Hi and 12CO(J = 1−0) in supershells. Detailed parsec-resolution case studies of two Milky Way supershells demonstrate an enhanced level of molecularisation over both objects, and hence provide the first quantitative observational evidence of increased molecular cloud production in volumes of space affected by supershell activity. Recent results on supergiant shells in the LMC suggest that while they do indeed help to organise the ISM into over-dense structures, their global contribution to molecular cloud formation is of the order of only ∼ 10%.

scholarly journals The driving of turbulence in simulations of molecular cloud formation and evolution

2017 ◽  
Vol 472 (2) ◽  
pp. 2496-2503 ◽  
Author(s):  
Bastian Körtgen ◽  
Christoph Federrath ◽  
Robi Banerjee
Keyword(s):  
Molecular Cloud ◽  
Cloud Formation ◽  
Formation And Evolution

scholarly journals The relative orientation between the magnetic field and gradients of surface brightness within thin velocity slices of 12CO and 13CO emission from the Taurus molecular cloud

2020 ◽  
Vol 496 (4) ◽  
pp. 4546-4564
Author(s):  
M Heyer ◽  
J D Soler ◽  
B Burkhart
Keyword(s):  
Magnetic Field ◽  
Mach Number ◽  
Turbulent Flows ◽  
Molecular Cloud ◽  
Random Errors ◽  
Spatial Gradients ◽  
Low Levels ◽  
The Magnetic Field ◽  
Taurus Molecular Cloud

ABSTRACT We examine the role of the interstellar magnetic field to modulate the orientation of turbulent flows within the Taurus molecular cloud using spatial gradients of thin velocity slices of 12CO and 13CO antenna temperatures. Our analysis accounts for the random errors of the gradients that arise from the thermal noise of the spectra. The orientations of the vectors normal to the antenna temperature gradient vectors are compared to the magnetic field orientations that are calculated from Planck 353 GHz polarization data. These relative orientations are parameterized with the projected Rayleigh statistic and mean resultant vector. For 12CO,   strongly parallel and strongly perpendicular relative orientations are found in 28 percent and 39 percent of the cloud area respectively. For the lower opacity 13CO emission, strongly parallel and strongly perpendicular orientations are found in 7 per cent and 43 per cent of the cloud area, respectively. For both isotopologues, strongly parallel or perpendicular alignments are restricted to localized regions with low levels of turbulence. If the relative orientations serve as an observational proxy to the Alfvénic Mach number then our results imply local variations of the Alfvénic Mach number throughout the cloud.

scholarly journals EFFECTS OF MAGNETIC FIELD STRENGTH AND ORIENTATION ON MOLECULAR CLOUD FORMATION

2009 ◽  
Vol 695 (1) ◽  
pp. 248-258 ◽  
Author(s):  
Fabian Heitsch ◽  
James M. Stone ◽  
Lee W. Hartmann
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Molecular Cloud ◽  
Cloud Formation

The Role of Pressure in Giant Molecular Cloud Formation

2004 ◽  
Vol 612 (1) ◽  
pp. L29-L32 ◽  
Author(s):  
Leo Blitz ◽  
Erik Rosolowsky
Keyword(s):  
Molecular Cloud ◽  
Cloud Formation ◽  
Giant Molecular Cloud

scholarly journals Giant molecular cloud formation through the Parker instability in a skewed magnetic field

1992 ◽  
Vol 393 ◽  
pp. L71 ◽  
Author(s):  
Tomoyuki Hanawa ◽  
Ryoji Matsumoto ◽  
Kazunari Shibata
Keyword(s):  
Magnetic Field ◽  
Molecular Cloud ◽  
Cloud Formation ◽  
Giant Molecular Cloud

The role of the magnetic field in a translucent molecular cloud

2018 ◽  
Vol 14 (A30) ◽  
pp. 108-108
Author(s):  
Georgia Panopoulou
Keyword(s):  
Magnetic Field ◽  
Molecular Cloud ◽  
Quantitative Estimate ◽  
Molecular Clouds ◽  
Dust Emission ◽  
Field Orientation ◽  
Magnetic Field Orientation ◽  
Cloud Evolution ◽  
The Magnetic Field

AbstractTranslucent molecular clouds represent a vastly underexplored regime of cloud evolution in terms of the effect of the magnetic field. Their pristine nature renders them ideal for investigating the initial properties of the magnetic field, prior to the onset of star formation. Using starlight polarimetry, we map the plane-of-sky magnetic field orientation throughout 10 sq. degrees of the Polaris Flare translucent molecular cloud. We provide the first quantitative estimate of the magnetic field strength in this type of system. By combining our measurements with the high-resolution Herschel dust emission map, we find a preferred alignment between filaments and the observed magnetic field. Our results support the presence of a strong magnetic field in this system (Panopoulou et al. 2016).

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