scholarly journals Cloud and Star Formation in Spiral Arms

2014 ◽  
pp. 147-156
Author(s):  
Clare Dobbs ◽  
Alex Pettitt
Keyword(s):  
Star Formation ◽  
Spiral Arms

scholarly journals The Galactic Ecosystem

2004 ◽  
Vol 213 ◽  
pp. 123-126
Author(s):  
Michael Burton
Keyword(s):  
Star Formation ◽  
Crucial Role ◽  
Self Regulation ◽  
Spiral Arms ◽  
Carbon Abundance

We discuss how the process of star formation across the spiral arms of galaxies functions as an ecosystem. The carbon abundance plays a crucial role in both its self-regulation and evolution.

scholarly journals [CII] emission and star formation in the spiral arms of M 31

2006 ◽  
Vol 453 (1) ◽  
pp. 77-82 ◽  
Author(s):  
N. J. Rodriguez-Fernandez ◽  
J. Braine ◽  
N. Brouillet ◽  
F. Combes
Keyword(s):  
Star Formation ◽  
Spiral Arms ◽  
M 31

scholarly journals Large Scale Star Formation: Density Waves, Superassociations and Propagation

1987 ◽  
Vol 115 ◽  
pp. 457-481 ◽  
Author(s):  
Bruce G. Elmegreen
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Density Waves ◽  
Spiral Arms ◽  
Gravitational Instabilities ◽  
Significant Difference ◽  
Star Formation In Galaxies ◽  
The Difference ◽  
The Waves

The hypothesis that density waves trigger star formation is critically examined. Much of the former evidence in favor of the hypothesis is shown to be inconsistent with modern observations. A comparison between galaxies with and without density waves reveals no significant difference in their star formation rates. A new role for density waves in the context of star formation might be based on four principles: 1. density waves are intrinsically strong, 2. the gas is compressed more than the stars in the wave, 3. star formation follows the gas, with no preferential trigger related to the wave itself, and 4. regions of star formation are larger in the spiral arms than they are between the arms. This new role for density waves is primarily one of organization: the waves place most of the gas in the arms, so most of the star formation is in the arms too. The waves also promote the coagulation of small clouds into large cloud complexes, or superclouds, by what appears to be a combination of collisional agglomeration and large-scale gravitational instabilities. Special regions where density waves do trigger a true excess of star formation are discussed, and possible reasons for the difference between these triggering waves and the more common, organizing, waves are mentioned. Other aspects of large-scale star formation, such as the occurrence of kiloparsec-size regions of activity and kiloparsec-range propagation, are illustrated with numerous examples. The importance of these largest scales to the overall mechanism of star formation in galaxies is emphasized.

scholarly journals Supplying Gas for Nuclear Star Formation: The Central Molecular Spiral of IC 342

1994 ◽  
Vol 140 ◽  
pp. 339-340 ◽  
Author(s):  
D. A. Levine ◽  
J. L. Turner ◽  
R. L. Hurt
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Density Wave ◽  
Wave Pattern ◽  
Molecular Gas ◽  
Spiral Arms

IC 342 is a large nearby (1.8Mpc) spiral galaxy undergoing a moderate nuclear starburst. Previous maps of the inner arc minute in 13CO (1→0) show that the nuclear molecular gas forms spiral arms approximately 500 pc in extent in a density wave pattern (Turner & Hurt, 1992).

Star formation in the spiral arms of NGC 4321. I - CO observations

1992 ◽  
Vol 103 ◽  
pp. 429 ◽  
Author(s):  
J. Cepa ◽  
J. E. Beckman ◽  
J. H. Knapen ◽  
N. Nakai ◽  
N. Kuno
Keyword(s):  
Star Formation ◽  
Spiral Arms ◽  
Co Observations

Efficient star formation in the spiral arms of M51

1990 ◽  
Vol 356 ◽  
pp. 135 ◽  
Author(s):  
Steven D. Lord ◽  
Judith S. Young
Keyword(s):  
Star Formation ◽  
Spiral Arms

Star formation in galactic spiral arms

Nature ◽  
1982 ◽  
Vol 297 (5863) ◽  
pp. 179-180
Author(s):  
Gerard Gilmore
Keyword(s):  
Star Formation ◽  
Spiral Arms ◽  
Galactic Spiral

scholarly journals The effect of spiral arms on star formation in the Galaxy

2012 ◽  
Vol 426 (1) ◽  
pp. 701-707 ◽  
Author(s):  
T. J. T. Moore ◽  
J. S. Urquhart ◽  
L. K. Morgan ◽  
M. A. Thompson
Keyword(s):  
Star Formation ◽  
Spiral Arms ◽  
The Galaxy

scholarly journals A Gaseous Group with Unusual Remote Star Formation

2011 ◽  
Vol 28 (3) ◽  
pp. 271-279 ◽  
Author(s):  
N. Santiago-Figueroa ◽  
M. E. Putman ◽  
J. Werk ◽  
G. R. Meurer ◽  
E. Ryan-Weber
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Spiral Arms ◽  
Gaseous Disk ◽  
Ram Pressure ◽  
The Galaxy ◽  
Galaxy Center ◽  
Region 10

AbstractWe present VLA 21-cm observations of the spiral galaxy ESO 481-G017 to determine the nature of remote star formation traced by an Hii region found 43 kpc and ∼800 km s−1 from the galaxy center (in projection). ESO 481-G017 is found to have a 120 kpc Hi disk with a mass of 1.2 × 1010M⊙ and UV GALEX images reveal spiral arms extending into the gaseous disk. Two dwarf galaxies with Hi masses close to 108M⊙ are detected at distances of ∼200 kpc from ESO 481-G017 and a Hi cloud with a mass of 6 × 107M⊙ is found near the position and velocity of the remote Hii region. The Hii region is somewhat offset from the Hi cloud spatially and there is no link to ESO 481-G017 or the dwarf galaxies. We consider several scenarios for the origin of the cloud and Hii region and find the most likely is a dwarf galaxy that is undergoing ram pressure stripping. The Hi mass of the cloud and Hi luminosity of the Hii region (1038.1 erg s−1) are consistent with dwarf galaxy properties, and the stripping can trigger the star formation as well as push the gas away from the stars.

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