Results 21 to 30 of about 17,543 (246)
Molecular Structures of Other Galaxies Compared to That of the Galaxy [PDF]
Symposium - International Astronomical Union, 1979 Of the eleven galaxies with detected CO emission, eight have bright nuclear CO sources: M82, NGC 253, M51, NGC 5236, NGC 1068, Maffei 2 (Rickard et al. 1977a,b), NGC 6946, and IC 342 (Morris and Lo 1978). Two have disk-population CO sources and no detectable nuclear source (M31 and M81, Combes et al. 1977a), and one has no obvious nucleus (LMC, Huggins,
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The Astrophysical Journal, 2023 We examine the wavelength dependence of radial light profiles based on Sérsic index n measurements of 1067 galaxies with M _* ≥ 10 ^9.5 M _⊙ and in the redshift range 0.5 < z < 3. The sample and rest-frame optical light profiles are drawn from the Cosmic
Marco Martorano +12 more
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Helical Structures in Seyfert Galaxies [PDF]
International Astronomical Union Colloquium, 2002 Abstract Seyfert galaxies with Z-shaped emission filaments in the Narrow Line Region (NLR) are considered. We assume that observable Z-shaped structures and the velocity pattern of the NLR may be explained as tri-dimensional helical waves in the ionization cone.
Moiseev, A. V. +4 more
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Translators of Galaxy Morphology Indicators between Observation and Simulation
The Astrophysical Journal, 2023 Based on the recent advancements in numerical simulations of galaxy formation, we anticipate the achievement of realistic models of galaxies in the near future.
J. K. Jang +11 more
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Dynamics of the Spiral-Arm Corotation and Its Observable Footprints in the Solar Neighborhood
Frontiers in Astronomy and Space Sciences, 2021 This article discusses the effects of the spiral-arm corotation on the stellar dynamics in the Solar Neighborhood (SN). All our results presented here rely on: (1) observational evidence that the Sun lies near the corotation circle, where stars rotate ...
Douglas A. Barros +4 more
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Symposium - International Astronomical Union, 1964 The title which the organizers of the Symposium have suggested for this introductory report covers an enormous domain. Even if one limits oneself, as I intend to do, to the large-scale structure, it is impossible to summarize this adequately in one communication.
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The Astrophysical Journal, 2023 We introduce a two-particle correlation function (2PCF) for the Milky Way, constructed to probe spatial correlations in the orthogonal directions of the stellar disk in the Galactic cylindrical coordinates of R , ϕ , and z . We use this new tool to probe
Austin Hinkel +2 more
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Spiral structure in external galaxies [PDF]
Symposium - International Astronomical Union, 1970 The need for observing at least four different categories of optical objects for a satisfactory definition of optical spiral structure is emphasized. A sequence of optical form-types for the description of spiral structure is outlined. A pronounced difference in the nature of the spiral structure of the outer and inner parts of Messier 33 is ...
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FORMATION AND MAINTENANCE OF SPIRAL STRUCTURE IN GALAXIES [PDF]
Symposium - International Astronomical Union, 1985 The formation and maintenance of spiral structure in galaxies is discussed in terms of spiral modes with a general perception consistent with the hypothesis of quasi-stationary spiral structure. The latter is explained in some detail to give it the original proper perspective and to contrast it with recent studies of non-stationary spiral structures ...
C. C. Lin, G. Bertin
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The Spiral Structure in the Solar Neighborhood
Frontiers in Astronomy and Space Sciences, 2021 The spiral structure in the solar neighborhood is an important issue in astronomy. In the past few years, there has been significant progress in observation. The distances for a large number of good spiral tracers, i.e., giant molecular clouds, high-mass
L. G. Hou
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