Results 271 to 280 of about 482,012 (314)

On the Extraction of Optical Rotation Curves for Spiral Galaxies

, 1998
Young‐Jong Sohn, Myung-Hyun Rhee, Mun‐Suk Chun   +2 more
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Late-type spiral galaxies

, 2007
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Distant Spiral Galaxies

Cosmic Pinwheels, 2020

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A repeating fast radio burst source localized to a nearby spiral galaxy

Nature, 2020
Fast radio bursts (FRBs) are brief, bright, extragalactic radio flashes1,2. Their physical origin remains unknown, but dozens of possible models have been postulated3. Some FRB sources exhibit repeat bursts4–7.
B. Marcote, K. Nimmo, K. Nimmo, J. Hessels, J. Hessels, S. Tendulkar, C. Bassa, Z. Paragi, A. Keimpema, M. Bhardwaj, R. Karuppusamy, V. Kaspi, C. Law, D. Michilli, K. Aggarwal, B. Andersen, A. Archibald, A. Archibald, K. Bandura, G. Bower, P. Boyle, C. Brar, S. Burke-Spolaor, B. Butler, T. Cassanelli, P. Chawla, P. Demorest, M. Dobbs, E. Fonseca, U. Giri, U. Giri, D. Good, K. Gourdji, A. Josephy, A. Kirichenko, A. Kirichenko, F. Kirsten, T. Landecker, D. Lang, T. Lazio, D. Li, H.-H. Lin, J. Linford, K. Masui, J. Mena-Parra, A. Naidu, C. Ng, C. Patel, Ue-Li Pen, Z. Pleunis, M. Rafiei-Ravandi, Mubdi Rahman, A. Renard, P. Scholz, P. Scholz, S. Siegel, Kendrick M. Smith, I. Stairs, K. Vanderlinde, A. Zwaniga   +59 more
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DYNAMICS OF SPIRAL GALAXIES

Frontiers of Applied Mathematics, 2007
The dynamics of spiral galaxies is a gold-mine of challenging problems for the astrophysicist and the applied mathematician. In Astrophysics, we may ask how these island-universes formed, evolved, and reached their current structure and thus address the problems of the dynamics of the interstellar medium, of star formation, of stellar dynamics, and of ...
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Spirals in galaxies

Proceedings of the International Astronomical Union, 2019
AbstractThe venerable problem of what causes the spiral features in disk galaxies is nearing a solution. In previous work, we have shown that transient spirals in simulations result from the superposition of a few coherent waves that have many properties of modes.
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Opaque spiral galaxies

Nature, 1990
The photographic images of a carefully selected sample of about 16,000 galaxies have been digitized, and an extensive set of photometric parameters has been determined. These data allow a reanalysis of the effective transparency using the measured surface brightness profiles for much larger, more strictly defined samples. Several tests provide evidence
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Magnetism of spiral galaxies

Nature, 1988
The concept of the turbulent dynamo in interstellar gas combined with the discovery of global magnetic structures in spiral galaxies has led to a consistent picture of galactic magnetism. Large-scale magnetic fields are generated and maintained by helical turbulent motions of interstellar gas and by differential galactic rotation.
Alexander Ruzmaikin, Dmitry Sokoloff, Anvar Shukurov   +2 more
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The Rotation of Spiral Galaxies

Science, 1983
There is accumulating evidence that as much as 90 percent of the mass of the universe is nonluminous and is clumped, halo-like, around individual galaxies. The gravitational force of this dark matter is presumed to be responsible for the high rotational velocities of stars and gas in the disks of spiral galaxies.
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Bisymmetric Spiral Magnetic Fields in Spiral Galaxies

1987
A radio polarization analysis was presented in 1978 by TOSA and FUJIMOTO [1] to determine a large-scale configuration of magnetic fields in the spiral galaxy M51. On the basis of the distributions of planes of polarization at 6 cm and 21 cm [2], they determined the rotation measures (RMs) of the Faraday effect and the intrinsic polarization angles. The
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