Results 21 to 30 of about 80,963 (169)

Nonlinear Density Wave Theory in a Gaseous Disk

The Astronomical Journal, 2023
A nonlinear solution for the gaseous component of a galactic disk has been derived self-consistently using fluid description and reductive perturbation theory. We show that gas follows a spiral pattern, similarly to the stellar component; but the spirals
Miroslava Vukcevic
doaj   +1 more source

The Potential-Density Phase Shift Method for Determining the Corotation Radii in Spiral and Barred Galaxies [PDF]

, 2006
We have developed a new method for determining the corotation radii of density waves in disk galaxies, which makes use of the radial distribution of an azimuthal phase shift between the potential and density wave patterns.
Arsenault R., Combes F., Contopoulos G., Contopoulos G., Contopoulos G., Contopoulos G., Donner K. J., Egusa F., Friedli D., Lin C. C., Lindblad P. A. B., Lindblad P. A. B., Lucentini J., Lynden-Bell D., Merrifield M. R., Pfenniger D., Pfenniger D., Rautiainen P., Ronald J. Buta, Schwarz M. P., Sparke L. S., Xiaolei Zhang, Zhang X.   +22 more
core   +4 more sources

Outer Rings in Early-type Galaxies: From Vorontsov-Velyaminov to Present

Open Astronomy, 2014
‘Ringed galaxies’, or disk galaxies with prominent outer ring structures, separated visually from the main galactic bodies, were discovered and intensively studied by B. A. Vorontsov-Vel’yaminov whose 110th anniversary is celebrated this year. We discuss
Silchenko O., Ilyina M., Katkov I.
doaj   +1 more source

Structural Parameters of Thin and Thick Disks in Edge-On Disk Galaxies

, 2005
We analyze the global structure of 34 late-type, edge-on, undisturbed, disk galaxies spanning a wide range of mass. We measure structural parameters for the galaxies using two-dimensional least-squares fitting to our $R$-band photometry. The fits require
Binggeli B., Buser R., de Grijs R., de Grijs R., Fuhrmann K., Gilmore G., Julianne J. Dalcanton, Karachentsev I. D., Karachentsev I. D., Kudrya Y. N., Pagel B. E. J., Peter Yoachim, Pohlen M., Robin A. C., Shaw M. A., Staveley-Smith L., van der Kruit P. C., van der Kruit P. C., van der Kruit P. C., van der Kruit P. C., van Dokkum P. G.   +20 more
core   +1 more source

Dynamics of Starbursting Dwarf Galaxies. III. A HI study of 18 nearby objects [PDF]

, 2014
We investigate the dynamics of starbursting dwarf galaxies, using both new and archival HI observations. We consider 18 nearby galaxies that have been resolved into single stars by HST observations, providing their star formation history and total ...
Fraternali, Filippo, Lelli, Federico, Verheijen, Marc   +2 more
core   +2 more sources

Finding Massive Double-exponential Disk Galaxies with Extended Low Surface Brightness Stellar Disk: An IllustrisTNG Exploration

The Astrophysical Journal
We study massive disk galaxies (stellar mass > = 10 ^11 M _⊙ ) at z = 0 from IllustrisTNG simulation to detect galaxies that contain two exponential stellar disks—a central high surface brightness (HSB) disk surrounded by an extended low surface ...
Suchira Sarkar, Kanak Saha
doaj   +1 more source

The Stability of Some Galaxy Disks is Still Perplexing

The Astrophysical Journal, 2023
The problem of how some disk galaxies avoid forming bars remains unsolved. Many galaxy models having reasonable properties continue to manifest vigorous instabilities that rapidly form strong bars and no widely accepted idea has yet been advanced to ...
J. A. Sellwood, R. G. Carlberg
doaj   +1 more source

Properties of simulated Milky Way-mass galaxies in loose group and field environments [PDF]

, 2012
We test the validity of comparing simulated field disk galaxies with the empirical properties of systems situated within environments more comparable to loose groups, including the Milky Way's Local Group.
Brook, C. B., Courty, S., Few, C. G., Gibson, B. K., Michel-Dansac, L., Stinson, G. S.   +5 more
core   +6 more sources

Multi‐Dielectric Metasurfaces for Ultrabright, Tunable Structural Color and Reconfigurable Optical Filtering with Extraordinarily Large Color Span

Advanced Optical Materials, EarlyView.
Structural color generation is an emerging field for digital display and printing applications. This report presents a novel truncated‐cone design and the first use of GaP sandwiched between two layers of TiO2, demonstrating ultra‐bright, tunable colors with a record color gamut.
Md Rumon Miah, Yavuz Selim Aydın, Hilmi Volkan Demir   +2 more
wiley   +1 more source

Massive Quiescent Disk Galaxies at 0.5 ≤ z ≤ 1 in CANDELS: Color Gradients and Likely Origin

The Astrophysical Journal
A rare population of massive disk-dominated quiescent galaxies has recently drawn much attention, which intrudes the red sequence (RS) population without destroying the underlying stellar disks.
Qifan Cui, Pinsong Zhao, F. S. Liu
doaj   +1 more source