Giant Molecular Cloud Complexes with Optical H II Regions: 12CO and 13CO Observations and Global Cloud Properties

1996 ◽  
Vol 463 ◽  
pp. 630 ◽  
Author(s):  
Mark H. Heyer ◽  
John M. Carpenter ◽  
E. F. Ladd
Keyword(s):  
Molecular Cloud ◽  
H Ii Regions ◽  
Cloud Properties ◽  
Giant Molecular Cloud

scholarly journals Gas Content in the GMC G333: hierarchical structure of turbulence

2012 ◽  
Vol 8 (S292) ◽  
pp. 49-49
Author(s):  
N. Lo ◽  
M. R. Cunningham ◽  
P. A. Jones ◽  
L. Bronfman
Keyword(s):  
Carbon Monoxide ◽  
Hierarchical Structure ◽  
Molecular Cloud ◽  
Gas Content ◽  
Preliminary Results ◽  
Cloud Properties ◽  
Giant Molecular Cloud ◽  
Molecular Lines

AbstractWe present our preliminary results on the application of dendrogram statistics to the carbon monoxide PPV map of the giant molecular cloud G333. We obtain the dendrograms at various merging levels and found the clustering of branches is independent from the merging levels. The statistics of intensity distributions show gravity is possibly significant in this cloud and the gas may be sonic. Application of this method to other molecular lines data are required for further analysis of the cloud properties.

scholarly journals THE PdBI ARCSECOND WHIRLPOOL SURVEY (PAWS): ENVIRONMENTAL DEPENDENCE OF GIANT MOLECULAR CLOUD PROPERTIES IN M51

2014 ◽  
Vol 784 (1) ◽  
pp. 3 ◽  
Author(s):  
Dario Colombo ◽  
Annie Hughes ◽  
Eva Schinnerer ◽  
Sharon E. Meidt ◽  
Adam K. Leroy ◽  
...  
Keyword(s):  
Molecular Cloud ◽  
Cloud Properties ◽  
Giant Molecular Cloud ◽  
Environmental Dependence

scholarly journals New insights in giant molecular cloud hosting the S147/S153 complex: signatures of interacting clouds

2020 ◽  
Author(s):  
Jayakumar Sushama Dhanya ◽  
Lokesh Kumar Dewangan ◽  
Devendra Kumar Ojha ◽  
Subhayan Mandal
Keyword(s):  
Molecular Cloud ◽  
Near Infrared ◽  
Galactic Plane ◽  
Line Of Sight ◽  
H Ii Regions ◽  
Infrared Excess ◽  
Ob Stars ◽  
Giant Molecular Cloud ◽  
Multi Wavelength ◽  
Perseus Arm

Abstract In order to understand the formation of massive OB stars, we report a multi-wavelength observational study of a giant molecular cloud hosting the S147/S153 complex (size ${\sim}90\:\:\mbox{pc} \times 50\:$pc). The selected complex is located in the Perseus arm, and contains at least five H ii regions (S147, S148, S149, S152, and S153) powered by massive OB stars with dynamical ages ${\sim}0.2$–$0.6\:$Myr. The Canadian Galactic Plane Survey $^{12}$CO line data (beam size ${\sim}{100{^{\prime \prime}_{.}}4}$) trace the complex in a velocity range of [$-59$, $-43]\:$km$\:$s$^{-1}$, and also reveal the presence of two molecular cloud components around $-54$ and $-49\:$km$\:$s$^{-1}$ in the direction of the complex. Signatures of the interaction/collision between these extended cloud components are investigated through their spatial and velocity connections. These outcomes suggest the collision of these molecular cloud components about $1.6\:$Myr ago. Based on the observed overlapping zones of the two clouds, the collision axis appears to be parallel to the line-of-sight. Deep near-infrared photometric analysis of point-like sources shows the distribution of infrared-excess sources in the direction of the overlapping zones of the molecular cloud components, where all the H ii regions are also spatially located. All elements put together, the birth of massive OB stars and embedded infrared-excess sources seems to be triggered by two colliding molecular clouds in the selected site. High-resolution observations of the dense gas tracer will be required to further confirm the proposed scenario.

scholarly journals ALMA CO observations of a giant molecular cloud in M 33: Evidence for high-mass star formation triggered by cloud–cloud collisions

2020 ◽  
Author(s):  
Hidetoshi Sano ◽  
Kisetsu Tsuge ◽  
Kazuki Tokuda ◽  
Kazuyuki Muraoka ◽  
Kengo Tachihara ◽  
...  
Keyword(s):  
Star Formation ◽  
Molecular Cloud ◽  
Molecular Clouds ◽  
Line Emission ◽  
High Mass ◽  
H Ii Regions ◽  
Mass Star ◽  
Star Forming ◽  
Spatially Resolved ◽  
Giant Molecular Cloud

Abstract We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M 33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M 33 using 12CO(J = 2–1), 13CO(J = 2–1), and C18O(J = 2–1) line emission at a spatial resolution of ∼2 pc. There are two individual molecular clouds with a systematic velocity difference of ∼6 km s−1. Three continuum sources representing up to ∼10 high-mass stars with spectral types of B0V–O7.5V are embedded within the densest parts of molecular clouds bright in the C18O(J = 2–1) line emission. The two molecular clouds show a complementary spatial distribution with a spatial displacement of ∼6.2 pc, and show a V-shaped structure in the position–velocity diagram. These observational features traced by CO and its isotopes are consistent with those in high-mass star-forming regions created by cloud–cloud collisions in the Galactic and Magellanic Cloud H ii regions. Our new finding in M 33 indicates that cloud–cloud collision is a promising process for triggering high-mass star formation in the Local Group.

scholarly journals STAR FORMATION AND YOUNG STELLAR CONTENT IN THE W3 GIANT MOLECULAR CLOUD

2011 ◽  
Vol 743 (1) ◽  
pp. 39 ◽  
Author(s):  
Alana Rivera-Ingraham ◽  
Peter G. Martin ◽  
Danae Polychroni ◽  
Toby J. T. Moore
Keyword(s):  
Star Formation ◽  
Molecular Cloud ◽  
Stellar Content ◽  
Giant Molecular Cloud

scholarly journals Massive stars in the giant molecular cloud G23.3−0.3 and W41

2014 ◽  
Vol 569 ◽  
pp. A20 ◽  
Author(s):  
Maria Messineo ◽  
Karl M. Menten ◽  
Donald F. Figer ◽  
Ben Davies ◽  
J. Simon Clark ◽  
...  
Keyword(s):  
Molecular Cloud ◽  
Massive Stars ◽  
Giant Molecular Cloud

scholarly journals Herschel 158 μm [C ii] Observations of “CO-dark” Gas in the Perseus Giant Molecular Cloud

2020 ◽  
Vol 899 (1) ◽  
pp. 23 ◽  
Author(s):  
K. P. Hall ◽  
Snežana Stanimirović ◽  
Min-Young Lee ◽  
Mark Wolfire ◽  
Paul Goldsmith
Keyword(s):  
Molecular Cloud ◽  
Giant Molecular Cloud
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