Results 31 to 40 of about 109,816 (295)
Spiral arms across stellar populations in simulations via the local dimension method
Astronomy & AstrophysicsContext. The origin and nature of spiral arms remain unclear. Star-forming regions and young stars are generally strongly associated with the spiral structure, but there are few quantitative predictions from simulations about the contribution of stars of
Ardèvol J. +5 more
doaj +1 more source
Star formation rates and the kinematics of gas in the spiral arms of NGC 628
, 2015 Relations between star formation rates along the spiral arms and the velocities of gas inflow into the arms in grand-design galaxy NGC 628 were studied.
Efremov, Yury N. +2 more
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The Myth of the Molecular Ring
, 2012 We investigate the structure of the Milky Way by determining how features in a spatial map correspond to CO features in a velocity map. We examine structures including logarithmic spiral arms, a ring and a bar.
Burkert, A., Dobbs, C. L.
core +1 more source
Magnetic spiral arms in galaxy haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 We seek the conditions for a {\it steady} mean field galactic dynamo. The parameter set is reduced to those appearing in the $ ^2$ and $ / $ dynamo, namely velocity amplitudes, and the ratio of sub-scale helicity to diffusivity. The parameters can be allowed to vary on conical spirals.
openaire +2 more sources
Triple Spiral Arms of a Triple Protostar System Imaged in Molecular Lines
The Astrophysical Journal, 2023 Most stars form in multiple-star systems. For a better understanding of their formation processes, it is important to resolve the individual protostellar components and the surrounding envelope and disk material at the earliest possible formation epoch ...
Jeong-Eun Lee +11 more
doaj +1 more source
The Distribution of Open Clusters in the Galaxy
Frontiers in Astronomy and Space Sciences, 2021 In this work we explore the new catalog of galactic open clusters that became available recently, containing 1,750 clusters that have been re-analyzed using the Gaia DR2 catalog to determine the stellar memberships.
Hektor Monteiro +3 more
doaj +1 more source
Stellar spiral arms in smooth-armed galaxies
The Astrophysical Journal, 1986 Deep multicolor surface photometry has been obtained for three extreme examples of smooth-armed spirals, galaxies with a global spiral pattern but with little or no interstellar gas, dust, or recent star formation: NGC 7743, NGC 495 and NGC 718. The results suggest that smooth-armed spirals may be transient bar-driven density waves (with a lifetime of ...
R. C., Jr. Kennicutt, B. K. Edgar
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The Galactic Distribution of Large HI Shells
, 2002 We report the discovery of nineteen new HI shells in the Southern Galactic Plane Survey (SGPS). These shells, which range in radius from 40 pc to 1 kpc, were found in the low resolution Parkes portion of the SGPS dataset, covering Galactic longitudes l ...
A. J. Green +17 more
core +1 more source
The evolution of Giant Molecular Filaments [PDF]
, 2017 In recent years there has been a growing interest in studying giant molecular filaments (GMFs), which are extremely elongated (> 100pc in length) giant molecular clouds (GMCs).
Dobbs, C. L., Duarte-Cabral, A.
core +2 more sources
Global Spiral Modes in NGC 1566: Observations and Theory [PDF]
, 2000 We present an observational and theoretical study of the spiral structure in galaxy NGC 1566. A digitized image of NGC 1566 in I-band was used for measurements of the radial dependence of amplitude variations in the spiral arms. We use the known velocity
B. A. Peterson +17 more
core +3 more sources