Results 41 to 50 of about 25,712 (75)
Magnetic and gaseous spiral arms in M83 [PDF]
Astronomy & Astrophysics, 2015 Isotropic and anisotropic wavelet transforms are used to decompose the images of the spiral galaxy M83 in various tracers to quantify structures in a range of scales from 0.2 to 10 kpc. We used radio polarization observations at 6 cm and 13 cm obtained with the VLA, Effelsberg and ATCA telescopes and APEX sub-mm observations at 870 m, which are ...
Matthias Ehle +6 more
openaire +4 more sources
Arm classifications for spiral galaxies
The Astrophysical Journal, 1987 On presente la classification de 762 galaxies.
Debra Meloy Elmegreen +1 more
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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). They are often seen as inter-arm features in external spiral galaxies, but have been tentatively associated with spiral arms when viewed in the Milky Way.
arxiv +1 more source
Galaxy Zoo and SpArcFiRe: Constraints on spiral arm formation mechanisms from spiral arm number and pitch angles [PDF]
, 2017 In this paper we study the morphological properties of spiral galaxies, including measurements of spiral arm number and pitch angle. Using Galaxy Zoo 2, a stellar mass-complete sample of 6,222 SDSS spiral galaxies is selected. We use the machine vision algorithm SpArcFiRe to identify spiral arm features and measure their associated geometries.
arxiv +1 more source
Magnetic Fields in Spiral Arms.
The Astrophysical Journal, 1953 In this paper two independent methods are described for estimating the magnetic field in the spiral arm in which we are located. The first method is based on an interpretation of the dispersion (of the order of 10° ) in the observed planes of polarization of the light of the distant stars; it leads to an estimate of H = 7.2 X 10 -6 gauss.
Subrahmanyan Chandrasekhar, Enrico Fermi
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Evidence for a two-armed spiral in the Milky Way [PDF]
arXiv, 2000 Emission profiles of the Galactic plane in K and at $240\micron$ are presented, and features associated with the tangents of the spiral arms are identified. In the K band, which traces stellar emission and suffers little from absorbtion, features associated with the arm tangents indicate that a two-armed logarithmic spiral dominates the nonaxisymmetric
arxiv
Magnetic spiral arms in galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 Large-scale magnetic fields in spiral galaxies are strongest in spiral-shaped regions, the magnetic arms. It was recently discovered for the galaxy NGC 6946 that magnetic arms can be interlaced with the gaseous arms, rather than coinciding with them. There are indications that the magnetic and gaseous arms may cross in some other galaxies.
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Cloud and Star Formation in Spiral Arms [PDF]
, 2014 10 pages, 5 figures, to be published in Seychelles conference "Lessons from the Local Group", ed. K. C. Freeman, B. G. Elmegreen, D. L. Block, and M.
Clare Dobbs, Alex R. Pettitt
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Limitations and rotation of the two-armed phase spiral in the Milky Way stellar disc [PDF]
A&A 690, A15 (2024)Context: The Milky Way's history of recent disturbances is vividly demonstrated by a structure in the vertical phase-space distribution known as the Gaia phase spiral. A one-armed phase spiral has been seen widely across the Milky Way disc, while a two-armed one has only been observed in the solar neighbourhood.
arxiv +1 more source
Application of the global modal approach to spiral galaxies [PDF]
arXiv, 2005 We have tested the applicability of the global modal approach in the density wave theory of spiral structure for a sample of six spiral galaxies: NGC 488, NGC 628, NGC 1566, NGC 2985, NGC 3938 and NGC 6503. The galaxies demonstrate a variety of spiral patterns from the regular open and tightly wound spiral patterns to a multi-armed spiral structure ...
arxiv