Results 11 to 20 of about 12,684 (325)
Revisiting Galactic Disk and Spiral Arms Using Open Clusters [PDF]
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 Role of Spiral Arms in Galaxies [PDF]
The Astrophysical JournalWe test the influence of spiral arms on the star formation activity of disk galaxies by constructing and fitting multiwavelength spectral energy distributions for the two nearby spiral galaxies NGC 628 and NGC 4321, at a spatial scale of 1–1.5 kpc ...
Bingqing Sun +2 more
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Milky Way spiral arms from open clusters in Gaia EDR3 [PDF]
Astronomy & Astrophysics, 2021 Context. The physical processes driving the formation of Galactic spiral arms are still under debate. Studies using open clusters favour the description of the Milky Way spiral arms as long-lived structures following the classical density wave theory ...
A. Castro-Ginard +9 more
semanticscholar +4 more sources
Do spiral arms enhance star formation efficiency? [PDF]
Astronomy & AstrophysicsSpiral arms, as those of our own Milky Way, are some of the most spectacular features in disc galaxies. It has been argued that star formation should proceed more efficiently in spiral arms as a result of gas compression.
M. Querejeta +34 more
semanticscholar +6 more sources
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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Triple Spiral Arms of a Triple Protostar System Imaged in Molecular Lines [PDF]
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
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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
openaire +6 more sources
Planet-driven Spiral Arms in Protoplanetary Disks. I. Formation Mechanism [PDF]
Astrophysical Journal, 2017 Protoplanetary disk simulations show that a single planet can excite more than one spiral arm, possibly explaining the recent observations of multiple spiral arms in some systems. In this paper, we explain the mechanism by which a planet excites multiple
J. Bae, Zhaohuan Zhu
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Planet-driven Spiral Arms in Protoplanetary Disks. II. Implications [PDF]
Astrophysical Journal, 2017 We examine whether various characteristics of planet-driven spiral arms can be used to constrain the masses of unseen planets and their positions within their disks.
J. Bae, Zhaohuan Zhu
semanticscholar +2 more sources
Impact of Calcium and Potassium Currents on Spiral Wave Dynamics in the LR1 Model [PDF]
EntropySpiral wave dynamics in cardiac tissue are critically implicated in the pathogenesis of arrhythmias. This study investigates the effects of modulating calcium and potassium currents on spiral wave stability in a two-dimensional cardiac model.
Xiaoping Yuan, Qianqian Zheng
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