Results 311 to 320 of about 12,684 (325)

Molecular Spiral Arms in M31

The Astrophysical Journal, 1996
We describe a high-resolution, high-sensitivity CO(1-0) survey of a large fraction of the south-west star-forming "ring" 20 kpc in diameter in M31 made with the 14 m FCRAO telescope and its QUARRY receiver array. At the 45'' angular resolution of the telescope, the ring is resolved into giant complexes of molecular gas with typical sizes of a few ...
Loinard, L, Dame, TM, Koper, E, Lequeux, J, Thaddeus, P, Young, JS   +5 more
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The Shape of Spiral Arms

Astrophysics and Space Science, 1986
The response by a gaseous disc to perturbations is investigated. Spectral analysis of the resulting pattern indicates that information about the nature of the perturber is maintained only if the perturbation is strong.
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A remark on the arms race spiral

Kybernetes, 2011
PurposeThe purpose of this paper is to explain the tendency of escalation of a regular bilateral arms race, or the arms race spiral.Design/methodology/approachInspired by the Richardson‐type models, a system of two differential equations is used for describing a bilateral arms race.
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Barred Spirals and Formation of Spiral Arms by Galaxies

Nature, 1965
SO far the formation of spiral arms, especially regular arms, has not been satisfactorily explained. The investigation of this phenomenon can be facilitated by an analysis of similar, but more peculiar, objects—barred spirals. A characteristic barred galaxy has a straight bar, which at the ends transforms abruptly into spiral arms.
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The Fine Structure of the Spiral‐arms

Astronomische Nachrichten, 1976
AbstractAn explanation for filaments inclined to the galactic plane observed in the next‐inner spiral‐arm is sought in terms of self‐consistent z‐oscillations. These filaments or „shingles”︁ are observed to be ˜ 1.4 kpc long, 70 pc thick and inclined to the plane by ˜ 12°.
TH. Schmidt‐Kaler, F. House
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Molecular spiral arms in M51

2008
The controversy surrounding the delineation of molecular spiral structure in the Galaxy emphasizes that spiral structure can best be understood by observing external galaxies with high angular resolution. M51, the galaxy in which spiral structure was first discerned, is the obvious galaxy to observe. Lo et al.
Vogel, S. N., Kulkarni, S. R., Scoville, N. Z., Hester, J.   +3 more
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Ordered and chaotic spiral arms

Astronomische Nachrichten, 2008
AbstractThe stellar flow at the arms of spiral galaxies is qualitatively different among different morphological types. The stars that reinforce the spiral arms can be either participating in an ordered or in a chaotic flow. Ordered flows are associated with normal (non‐barred) spiral galaxies.
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Galactic Spiral Arms and Evolution

Publications of the Astronomical Society of Australia, 1973
It is more than 120 years since the discovery of spiral galaxies, and naturally there has been much speculation on their origin. The vital clue is the composition of the arms, and it is now known that the arms are patterns of newly formed, and hence very luminous, stars.
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Multicolor photometry of spiral arms

Symposium - International Astronomical Union, 1966
This paper describes the use of multicolor photometry to examine differences in stellar population across an arm of a spiral galaxy. We know that spiral arms are the loci of contemporary star formation, but we have no assurance that those loci are frozen in the rotating material of the galactic disk.
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Spiral Arm Waves in Galaxies

1991
Spiral galaxies are often spectacular and pretty looking objects, and as such capture the imagination of many astronomers. The problems of the occurrence, formation and maintenance of spiral structure continue to be popular, and a vast literature exists on the subject.
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