Results 141 to 150 of about 367,666 (163)

Observational Manifestation of Chaos in Grand Design Spiral Galaxies

, 2003
To study dynamic properties of the gaseous disk of the grand design spiral galaxy NGC 3631 we calculate the Lyapunov characteristic numbers (LCN) for different families of streamlines in the disk. For the trajectories near separatrices of the giant vortices and near saddle points presenting in the velocity field, the LCN turned out to be positive.
A. M. Fridman, R. Z. Sagdeev, Oleg V. Khoruzii, E. V. Polyachenko   +3 more
semanticscholar   +4 more sources

Observational Manifestation of Chaos in the Gaseous Disk of the Grand Design Spiral Galaxy NGC 3631

, 2002
The main goal of the paper is to demonstrate the presence of chaotic trajectories in the gaseous disk of a real spiral galaxy. As an example we have chosen NGC 3631. First, we show the stationarity of the 3-D velocity field restored from the observed line-of-sight velocity field of the gaseous disk.
A. M. Fridman, O. V. Khoruzhii, E. V. Polyachenko   +2 more
semanticscholar   +4 more sources

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Non-circular motion estimation of the grand-design spiral galaxy NGC 628

AIP Conference Proceedings, 2013
I present a harmonic decomposition analysis of the grand-design spiral galaxy NGC 628 using the H I data from The H I Nearby Galaxy Survey (THINGS), Walter et al., Astron. J. 136, 2563 (2008). The harmonic decomposition analysis allows the estimation of the peculiar motion magnitude of the galaxy not counted in the rotation of the disk.
D. Colombo
openaire   +3 more sources

PANORAMIC: Discovery of an ultra-massive grand-design spiral galaxy at z∼5.2

Astronomy & Astrophysics
We report the discovery of an ultra-massive grand-design red spiral galaxy, named Zhúlóng (Torch Dragon), at z_ phot in the JWST PANORAMIC survey; it is the most distant bulge+disk galaxy candidate with spiral arms known to date.
Mengyuan Xiao, Christina C. Williams, Pascal A. Oesch, D. Elbaz, M. Dessauges‐Zavadsky, R. Marques-Chaves, L. Bing, Zhiyuan Ji, Andrea Weibel, Rachel Bezanson, Gabriel Brammer, Caitlin M. Casey   +11 more
openalex   +2 more sources

Grand Design, Multiple Arm, and Flocculent Spiral Galaxies

Annals of the New York Academy of Sciences, 1990
Les proprietes et les origines possibles de 3 types de structure spirale galactique sont passees en ...
Bruce G. Elmegreen
openalex   +3 more sources

The Car–Sgr arm as outlined by superclouds and the grand design of the Galaxy

, 1998
It is found that H I superclouds are regularly spaced along the very long Car-Sgr arm, the mutual distances being mostly 0.1 and 0.2 in units of the Solar distance to the centre.
Y. Efremov
semanticscholar   +1 more source

The role of molecular clouds in the star formation process as observed in two grand design spiral galaxies

, 1987
S. D. Lord
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