Results 71 to 80 of about 109,816 (295)
Star Formation in Spiral Arms [PDF]
EAS Publications Series, 2011 13 pages, 3 figures, Ecole Evry Schatzman 2010: Star Formation in the Local Universe.
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Multiplex Modular Nanorobotic Systems with Catalytic Activity under Magnetic Navigation
Advanced Functional Materials, EarlyView.We present modular nanorobots composed of a magnetic propulsion module and different extension modules carrying functional activities, assembled via DNA base pairing. The system integrates propulsion, optical tracking, enzymatic catalysis, and cell docking in a programmable manner.
Voichita Mihali +7 more
wiley +1 more source
Detection of a Corrugated Velocity Pattern in the Spiral Galaxy NGC 5427 [PDF]
, 2000 Here we report the detection, in Halpha emission, of a radial corrugation in the velocity field of the spiral galaxy NGC 5427. The central velocity of the Halpha line displays coherent, wavy-like variations in the vicinity of the spiral arms. The spectra
Berdnikov L. N. +18 more
core +2 more sources
, 2019 A method which we have developed for determining corotation radii, has allowed us to map in detail the radial resonant structures of barred spiral galaxies. Here we have combined this information with new determinations of the bar strength and the pitch angle of the innermost segment of the spiral arms to find relationships between these parameters of ...
Font, Joan +3 more
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Magnetic Fields in Spiral Arms.
The Astrophysical Journal, 1953 In this paper two independent methods are described for estimating the magnetic field in the spiral arm in which we are located. The first method is based on an interpretation of the dispersion (of the order of 10° ) in the observed planes of polarization of the light of the distant stars; it leads to an estimate of H = 7.2 X 10 -6 gauss.
S. Chandrasekhar, E. Fermi
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Advanced Functional Materials, EarlyView.Developing recyclable materials for magnetic robotics that combine rapid response and self‐healing properties is challenging. Hence, this study focuses on the integration of magnetothermal nanoparticles into a dynamic sorbitol‐based vitrimer, a recyclable composite capable of remote actuation and self‐healing by magnetic heating.
Maria Weißpflog +3 more
wiley +1 more source
JWST Reveals a Surprisingly High Fraction of Galaxies Being Spiral-like at 0.5 ≤ z ≤ 4
The Astrophysical Journal LettersSpiral arms are one of the most important features used to classify the morphology of local galaxies. The cosmic epoch when spiral arms first appeared contains essential clues to the evolution of disk galaxies.
Vicki Kuhn +5 more
doaj +1 more source
The collective origin of spiral structures in disk galaxies
EPJ Web of Conferences, 2012 After almost fifty years the origin of spiral arms in disk galaxies remains one of the major unsolved problems in astrophysics. Recent attempts have indicated that substructures in the dark matter halos of galaxies could induce spiral patterns in disks ...
Hernquist L. +2 more
doaj +1 more source
The relation between magnetic and material arms in models for spiral galaxies
, 2013 Context. Observations of polarized radio emission show that large-scale (regular) magnetic fields in spiral galaxies are not axisymmetric, but generally stronger in interarm regions.
Arshakian, T. G. +5 more
core +1 more source
Galaxy Zoo and sparcfire: constraints on spiral arm formation mechanisms from spiral arm number and pitch angles [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 In this paper we study the morphological properties of spiral galaxies, including measurements of spiral arm number and pitch angle. Using Galaxy Zoo 2, a stellar mass-complete sample of 6,222 SDSS spiral galaxies is selected. We use the machine vision algorithm SpArcFiRe to identify spiral arm features and measure their associated geometries.
Ross E. Hart +9 more
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