Results 51 to 60 of about 12,684 (325)
Super Multi-Armed and Segmented Spiral Pattern in a Reaction-Diffusion Model
IEEE Access, 2019 The super multi-armed and segmented (SMAS) spiral pattern has been observed in nature, such as sunflower inflorescence, spiral aloe, pine cone, ball cactus and Roman broccoli, which is characterized by several segmented spiral arms sharing the same ...
Jian Gao, Changgui Gu
doaj +1 more source
Nature, 1971 The Spiral Structure of Our Galaxy . Edited by W. Becker and G. Contopoulos. (International Astronomical Union Symposium No. 36, held in Basel, Switzerland, August 29–September 4, 1969.) Pp. xiii + 478. (Reidel: Dordrecht, 1970.) Hfl. 80.
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GALACTIC SPIRAL ARMS BY SWING AMPLIFICATION [PDF]
The Astrophysical Journal, 2016 ABSTRACT Based on the swing amplification model of Julian & Toomre, we investigate the formation and structure of stellar spirals in disk galaxies. We calculate the pitch angle, wavelengths, and amplification factor of the most amplified mode.
Michikoshi, Shugo, Kokubo, Eiichiro
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Thermal Infrared Imaging of MWC 758 with the Large Binocular Telescope: Planetary-driven Spiral Arms? [PDF]
Astrophysical Journal, 2019 Theoretical studies suggest that a giant planet around the young star MWC 758 could be responsible for driving the spiral features in its circumstellar disk.
K. Wagner +7 more
semanticscholar +1 more source
PITCH ANGLE OF GALACTIC SPIRAL ARMS [PDF]
The Astrophysical Journal, 2014 17 pages, 8 figures, accepted for publication in ...
Michikoshi, Shugo, Kokubo, Eiichiro
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Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2 [PDF]
Astronomy & Astrophysics, 2019 In this paper we introduce a new method for analysing Milky Way phase-space which allows us to reveal the imprint left by the Milky Way bar and spiral arms on the stars with full phase-space data in Gaia Data Release 2.
S. Khoperskov +7 more
semanticscholar +1 more source
The Statistical Properties of Spiral Arms in Nearby Disk Galaxies
Astrophysical Journal, 2020 We analyze 4378 nearby bright disk (S0 and spiral) galaxies selected from the Sloan Digital Sky Survey to characterize their spiral structure and systematically investigate the relationships between spiral arm properties (strength, pitch angle, and ...
Sijie Yu, L. Ho
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Triggered star formation in spiral arms [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractWe present preliminary results for six spiral galaxies from a sample of 25, where we have used the method developed by González & Graham (1996) to search for and analyze azimuthal color gradients across spiral arms. The six galaxies analyzed here are NGC 1703 (SBrb), NGC 3001 (SABrsbc), NGC 3059 (SBrsbc), NGC 3513 (SBrsc), NGC 4593 (RSBrsb),
E. E. Martínez-García +2 more
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The Observability of Vortex-driven Spiral Arms in Protoplanetary Disks: Basic Spiral Properties [PDF]
Astrophysical Journal, 2019 Some circumstellar disks are observed to show prominent spiral arms in infrared scattered light or (sub-)millimeter dust continuum. The spirals might be formed from self-gravity, shadows, or planet-disk interactions.
P. Huang +4 more
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Multiple Spiral Arms in the Disk around Intermediate-mass Binary HD 34700A [PDF]
Astrophysical Journal, 2019 We present the first images of the transition disk around the close binary system HD 34700A in polarized scattered light using the Gemini Planet Imager instrument on Gemini South.
J. Monnier +16 more
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