Results 251 to 260 of about 593,852 (287)

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
openaire   +2 more sources

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.
openaire   +1 more source

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.
openaire   +2 more sources

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.
openaire   +1 more source

Molecular spiral arms in M51

2008
© 1988 Springer-Verlag.
Vogel, S. N., Kulkarni, S. R., Scoville, N. Z., Hester, J.   +3 more
openaire   +2 more sources

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.
openaire   +1 more source

Starbursting in Spiral Arms and ULIRGs

2001
We present results from HST Hα and Pα imaging of HII regions in M51 which are used to define the properties of OB star clusters in the ‘starburst’ regions of spiral arms. These data indicate an observed Hα luminosity function which truncates on the high end at L Hα = 1039 erg sec−1.
Scoville, Nick, Polletta, Maria
openaire   +2 more sources

The Dynamics of the Carina Spiral Arm

2006
We map and study the dynamics of the Milky Way’s spiral arms in our vicinity, using the birth place of open clusters. Since these objects are located in the galactic plane and are born primarily in the arms, they are an excellent tool for analyzing the dynamics of the spiral structure.
Smadar Naoz, Nir J. Shaviv
openaire   +1 more source

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.
openaire   +1 more source

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.
openaire   +1 more source