scholarly journals Hierarchical star formation across the grand-design spiral NGC 1566

2017 ◽  
Vol 468 (1) ◽  
pp. 509-530 ◽  
Author(s):  
Dimitrios A. Gouliermis ◽  
Bruce G. Elmegreen ◽  
Debra M. Elmegreen ◽  
Daniela Calzetti ◽  
Michele Cignoni ◽  
...  
Keyword(s):  
Star Formation ◽  
Grand Design ◽  
Design Spiral

scholarly journals GIANT MOLECULAR CLOUDS AND STAR FORMATION IN THE NON-GRAND DESIGN SPIRAL GALAXY NGC 6946

2012 ◽  
Vol 757 (2) ◽  
pp. 155 ◽  
Author(s):  
David Rebolledo ◽  
Tony Wong ◽  
Adam Leroy ◽  
Jin Koda ◽  
Jennifer Donovan Meyer
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Molecular Clouds ◽  
Giant Molecular Clouds ◽  
Ngc 6946 ◽  
Grand Design ◽  
Design Spiral

Observational Manifestation of Chaos in Grand Design Spiral Galaxies

2003 ◽  
pp. 223-234 ◽  
Author(s):  
Alexei M. Fridman ◽  
Roald Z. Sagdeev ◽  
Oleg V. Khoruzii ◽  
Evgenii V. Polyachenko
Keyword(s):  
Spiral Galaxies ◽  
Grand Design ◽  
Observational Manifestation ◽  
Design Spiral

scholarly journals Selfpropagating Stochastic Star Formation and Spiral Structure

1983 ◽  
Vol 100 ◽  
pp. 141-142 ◽  
Author(s):  
J. V. Feitzinger ◽  
P. E. Seiden
Keyword(s):  
Star Formation ◽  
Spiral Structure ◽  
Relative Importance ◽  
Formation Model ◽  
Density Waves ◽  
Spiral Density Waves ◽  
Two Component ◽  
Grand Design ◽  
Dynamic Phenomena

Spiral structure in galaxies can arise from both dynamic and non dynamic phenomena: spiral density waves and stochastic selfpropagating star formation. The relative importance of these effects is still not known. Deficiences of the original selfpropagating star formation model (where only stars are taken into account) are overcome by explicitly considering the stars embedded in and interacting with a two-component gas (Seiden and Gerola, 1979; Seiden, Schulman and Feitzinger, 1982; Seiden and Gerola, 1982). The two-component gas is essential because it is the means by which we get feedback in the interaction between stars and gas. The coupling between stars and gas regulates and stabilizes star formation in a galaxy. Under proper conditions this model can give good grand design spirals (Fig. 1).

scholarly journals Young stellar clusters triggered by a density wave in NGC 2997

2006 ◽  
Vol 2 (S237) ◽  
pp. 417-417
Author(s):  
P. Grosbøl ◽  
H. Dottori ◽  
R. Gredel
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Density Wave ◽  
Star Formation History ◽  
Stellar Clusters ◽  
Star Forming ◽  
Continuous Formation ◽  
Grand Design ◽  
K Band ◽  
Design Spiral

AbstractBright knots along the arms of grand-design spiral galaxies are frequently seen on near-infrared K-band images. To investigate their nature, low resolution K-band spectra of a string of knots in the southern arm of the grand design, spiral galaxy NGC 2997 were obtained with ISAAC/VLT. Most of the knots show strong Brγ emission while some have H2 and HeI emission. A few knots show indications of CO absorption. Their spectra and absolute K magnitudes exceeding -12 mag suggest them to be very compact, young stellar clusters with masses up to 5 × 104 M. The knots' azimuthal distance from the K-band spiral correlates well with their Brγ strength, indicating that they are located inside the co-rotation of the density wave, which triggered them through a large-scale, star-forming front. These relative azimuthal distances suggest an age spread of more than 1.6 Myr, which is incompatible with standard models for an instantaneous star burst. This indicates a more complex star-formation history, such as several bursts or continuous formation.

scholarly journals J1649+2635: a grand-design spiral with a large double-lobed radio source

2014 ◽  
Vol 446 (4) ◽  
pp. 4176-4185 ◽  
Author(s):  
Minnie Y. Mao ◽  
Frazer Owen ◽  
Ryan Duffin ◽  
Bill Keel ◽  
Mark Lacy ◽  
...  
Keyword(s):  
Radio Source ◽  
Grand Design ◽  
Design Spiral

scholarly journals Large-scale galactic shock phenomena and the implications on star formation

1970 ◽  
Vol 38 ◽  
pp. 415-422
Author(s):  
W. W. Roberts
Keyword(s):  
Star Formation ◽  
Gravitational Collapse ◽  
Large Scale ◽  
Milky Way ◽  
Spiral Structure ◽  
Triggering Mechanism ◽  
Grand Design ◽  
Armed Spiral

The possible existence of a stationary two-armed spiral shock pattern for a disk-shaped galaxy, such as our own Milky Way System, is demonstrated. It is therefore suggested that large-scale galactic shock phenomena may very well form the large-scale triggering mechanism for the gravitational collapse of gas clouds, leading to star formation along narrow spiral arcs within a two-armed grand design of spiral structure.

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