Results 51 to 60 of about 30,254 (217)

Dynamics of stars around spiral arms in an N-body/SPH simulated barred-spiral galaxy [PDF]

, 2009
We run N-body smoothed particle hydrodynamics (SPH) simulations of a Milky Way sized galaxy. The code takes into account hydrodynamics, self-gravity, star formation, supernova and stellar wind feedback, radiative cooling and metal enrichment.
R. Grand, D. Kawata, M. Cropper
semanticscholar   +1 more source

On the Link Between Central Black Holes, Bar Dynamics, and Dark Matter Halos in Spiral Galaxies [PDF]

, 2011
The discovery of a relationship between supermassive black hole (SMBH) mass and spiral arm pitch angle (P) is evidence that SMBHs are tied to the overall secular evolution of a galaxy.
Amber D. Sierra, Athanassoula, Athanassoula, Athanassoula, Bandara, Bell, Bell, Block, Booth, Buta, Buta, Buta, Buta, Byrd, Canzian, Catinella, Cisternas, Claud H. S. Lacy, Considère, Contopoulos, Daniel Kennefick, Das, Davis, de Grijs, de Vaucouleurs, Debattista, Egusa, Ferrarese, Ferrarese, Garcia, Garcia-Gomez, Gebhardt, Gebhardt, Grouchy, Heikki Salo, Ho, Ho, Hubble, Ismaeel Al-Baidhany, Jogee, Julia Kennefick, Kalnajs, Kennicutt, Kormendy, Kormendy, Laurikainen, Laurikainen, Laurikainen, Laurikainen, Lin, Lynden Bell, Marc S. Seigar, Mathewson, Merlin, Márquez, Orban de Xivry, Patrick Treuthardt, Paturel, Persic, Puerari, Rautiainen, Rautiainen, Ringermacher, Roberts, Salo, Salo, Satyapal, Satyapal, Schröder, Schwarz, Seigar, Seigar, Seigar, Seigar, Seigar, Seigar, Sheth, Tremaine, Treuthardt, van den Bosch, Volonteri, Weiner   +81 more
core   +1 more source

Dense Molecular Gas Associated with the Circumnuclear Star-forming Ring in the Barred Spiral Galaxy NGC 6951 [PDF]

, 1998
We present high-resolution (3''-5'') observations of CO (1-0) and HCN (1-0) emission from the circumnuclear star-forming ring in the barred spiral galaxy NGC 6951, a host of a type 2 Seyfert nucleus, using the Nobeyama Millimeter Array and the Nobeyama ...
K. Kohno, R. Kawabe, B. Vila-Vilaro
semanticscholar   +1 more source

Diffusion in barred-spiral galaxies

, 2010
We characterize the radial migration of stars in the disk plane by calculating the diffusion coefficient and the diffusion time-scale for a bulge-disk N-body self-consistent system with a marginally-stable Toomre-Q parameter. We find that diffusion is not constant in time, but follows the evolution of the bar, and becomes maximum near the corotation ...
Brunetti, Maura, Chiappini, Cristina, Pfenniger, Daniel   +2 more
openaire   +3 more sources

Effect of bars on the galaxy properties

, 2016
Aims: With the aim of assessing the effects of bars on disc galaxy properties, we present an analysis of different characteristics of spiral galaxies with strong, weak and without bars.
Alonso, Sol, Coldwell, Georgina, Vera, Matias   +2 more
core   +1 more source

Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Nonbarred Spiral Galaxies [PDF]

Publications of the Astronomical Society of Japan, 2007
Abstract The data from a CO ($J$ = 1–0) mapping survey of 40 nearby spiral galaxies, performed with the Nobeyama 45 m telescope, are presented. The criteria of the sample selection were: (1) RC3 morphological type ranging from Sa to Scd, (2) distance of less than 25 Mpc, (3) inclination angle less than 79$^{\circ}$ (RC3), (4) flux at 100$
Hiroyuki Nakanishi, Tomoka Tosaki, Y. Shioya, N. Kuno, Naoko Sato, Kazuo Sorai, Kota Nishiyama, Naomasa Nakai, Akihiko Hirota, Baltasar Vila-Vilaro   +9 more
openaire   +3 more sources

Chaotic Spiral Galaxies

, 2011
We study the role of asymptotic curves in supporting the spiral structure of a N-body model simulating a barred spiral galaxy. Chaotic orbits with initial conditions on the unstable asymptotic curves of the main unstable periodic orbits follow the shape ...
Contopoulos, George, Harsoula, Mirella
core   +1 more source

Multiple pattern speeds and the manifold spirals in a simulation of a barred spiral galaxy

Monthly notices of the Royal Astronomical Society
Observations of real galaxies as well as N-body simulations often indicate the presence of multiple pattern speeds in the disc of a barred spiral galaxy.
K. Zouloumi, M. Harsoula, C. Efthymiopoulos   +2 more
semanticscholar   +1 more source

Formation of the spiral structure in SB galaxies [PDF]

Astronomy Letters, 2001
We consider a scenario of formation of the spiral structure in barred galaxies. This scenario includes the new non-resonant mechanism of elongation of spirals, due to the characteristic behaviour of the gravitational potential beyond the principal spiral arms.
Evgenii V. Polyachenko, Valerij L. Polyachenko   +1 more
openaire   +3 more sources

Bar-driven Transport of Molecular Gas to Galactic Centers and Its Consequences [PDF]

, 1999
We study the characteristics of molecular gas in the central regions of spiral galaxies on the basis of our CO(J=1-0) imaging survey of 20 nearby spiral galaxies using the NRO and OVRO millimeter arrays. Condensations of molecular gas at galactic centers
Arimoto N., Bloemen J. B. G. M., Buat V., Casoli F., Dahmen G., Friedli D., Friedli D., Hawarden T. G., Huang J. H., Hummel E., K. Sakamoto, N. Z. Scoville, Noguchi M., S. Ishizuki, S. K. Okumura, Safronov V. S., Sakamoto K., Vila-Costas M. B., Wada K.   +18 more
core   +3 more sources