Results 11 to 20 of about 593,852 (287)
Revisiting Galactic Disk and Spiral Arms Using Open Clusters
The Astronomical Journal, 2023 We use the largest catalog of open clusters in the post-Gaia era to provide an observational view of the Galactic disk. By compiling physical parameters such as age, distance, and kinematic information, we investigate the spatial distribution of open ...
Yogesh C. Joshi, Sagar Malhotra
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The dynamics of long-lived spiral arms
EPJ Web of Conferences, 2012 It has been believed that spiral arms in pure stellar disks decay in several galactic rotations due to the heating by the spiral arms. However, it might be caused by a numerical heating.
Wada K. +5 more
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The nature of arms in spiral galaxies [PDF]
Astronomy & Astrophysics, 2003 We present here the results of an imaging study of eight grand-design and two intermediate-arm galaxies, based on CCD observations in U, B, V, R and I. We give grey-scale images, both in individual and in colour indices. Also we present a decomposition into bulge and disc following an iterative method. This provides us with a reasonable estimate of the
null M. S. del Río, J. Cepa
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Stellar dynamics around transient co-rotating spiral arms [PDF]
EPJ Web of Conferences, 2012 Spiral density wave theory attempts to describe the spiral pattern in spiral galaxies in terms of a long-lived wave structure with a constant pattern speed in order to avoid the winding dilemma.
Cropper M., Grand R.J.J., Kawata D.
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On the Formation of Spiral Arms in Dwarf Galaxies [PDF]
Astronomy Reports, 2021 Spiral structure (both flocculent and Grand Design types) is very rarely observed in dwarf galaxies because the formation of spiral arms requires special conditions. In this work we analyze the sample of about 40 dS-galaxies found by scanning by eye the images of late-type galaxies with $m_B<15^m$ and $M_B>-18^m$ and photometric diameter $D_{25 ...
Zasov, Anatoly V. +3 more
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A Comparison of the Simulations and Observations for a Nearby Spiral Arm
Frontiers in Astronomy and Space Sciences, 2021 The analysis is focused on the ability of galactic open clusters to trace the spiral arms, based on the recent data releases from Gaia. For this, a simple 1D description of the motion of spiral arms and clusters is introduced.
Martin Piecka, Ernst Paunzen
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Spiral Arms Around a Star: Geometric Explanation [PDF]
, 2022 Recently, astronomers discovered spiral arms around a star. While their shape is similar to the shape of the spiral arms in the galaxies, however, because of the different scale, galaxy-related physical explanations of galactic spirals cannot be directly
Puebla, Juan L., Kreinovich, Vladik
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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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Tracing the spiral arms in IP Pegasi [PDF]
Astronomy & Astrophysics, 2005 We report the analysis of time-resolved spectroscopy of IP Pegasi in outburst with eclipse mapping techniques to investigate the location and geometry of the observed spiral structures. We were able to obtain an improved view of the spiral structures with the aid of light curves extracted in velocity bins matching the observed range of velocities of ...
Baptista, R. +4 more
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Invariant manifolds in barred galaxy simulations
Astronomy & AstrophysicsContext. Understanding the nature of spiral arms in disc galaxies remains an open problem. Invariant manifolds associated with bars provide a framework in which particles with specific kinematic properties (manifold-compatible) are naturally able to ...
Soler-Terricabras T. +2 more
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