Results 31 to 40 of about 109,364 (298)
Spiral arms across stellar populations in simulations via the local dimension method
Astronomy & AstrophysicsContext. The origin and nature of spiral arms remain unclear. Star-forming regions and young stars are generally strongly associated with the spiral structure, but there are few quantitative predictions from simulations about the contribution of stars of
Ardèvol J. +5 more
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Triple Spiral Arms of a Triple Protostar System Imaged in Molecular Lines
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
doaj +1 more source
The Distribution of Open Clusters in the Galaxy
Frontiers in Astronomy and Space Sciences, 2021 In this work we explore the new catalog of galactic open clusters that became available recently, containing 1,750 clusters that have been re-analyzed using the Gaia DR2 catalog to determine the stellar memberships.
Hektor Monteiro +3 more
doaj +1 more source
Spiral Density Waves in a Young Protoplanetary Disk [PDF]
, 2016 Gravitational forces are expected to excite spiral density waves in protoplanetary disks, disks of gas and dust orbiting young stars. However, previous observations that showed spiral structure were not able to probe disk midplanes, where most of the ...
Andrews, Sean M. +22 more
core +3 more sources
Magnetic spiral arms in galaxy haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 We seek the conditions for a {\it steady} mean field galactic dynamo. The parameter set is reduced to those appearing in the $ ^2$ and $ / $ dynamo, namely velocity amplitudes, and the ratio of sub-scale helicity to diffusivity. The parameters can be allowed to vary on conical spirals.
openaire +2 more sources
Stellar spiral arms in smooth-armed galaxies
The Astrophysical Journal, 1986 Deep multicolor surface photometry has been obtained for three extreme examples of smooth-armed spirals, galaxies with a global spiral pattern but with little or no interstellar gas, dust, or recent star formation: NGC 7743, NGC 495 and NGC 718. The results suggest that smooth-armed spirals may be transient bar-driven density waves (with a lifetime of ...
R. C., Jr. Kennicutt, B. K. Edgar
openaire +1 more source
The dynamics of spiral arms in pure stellar disks
, 2011 It has been believed that spirals in pure stellar disks, especially the ones spontaneously formed, decay in several galactic rotations due to the increase of stellar velocity dispersions.
Baba +22 more
core +1 more source
Star formation in galaxies: the role of spiral arms [PDF]
, 2013 Studying star formation in spiral arms tells us not only about the evolution of star formation, and molecular clouds, but can also tell us about the nature of spiral structure in galaxies.
Dobbs, Clare
core +1 more source
Stiffness estimation of planar spiral spring based on Gaussian process regression
Scientific Reports, 2022 Planar spiral spring is important for the dimensional miniaturisation of motor-based elastic actuators. However, when the stiffness calculation of the spring arm is based on simple beam bending theory, the results possess substantial errors compared with
Jingjing Liu +6 more
doaj +1 more source
Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?
FEBS Letters, EarlyView.This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes +3 more
wiley +1 more source