Results 51 to 60 of about 176,075 (225)
Perturbed precessing ellipses as the building blocks of spiral arms in a barred galaxy with two pattern speeds [PDF]
, 2022 Observations and simulations of barred spiral galaxies have shown that, in general, the spiral arms rotate at a different pattern speed to that of the bar. The main conclusion from the bibliography is that the bar rotates faster than the spiral arms with a double or even a triple value of angular velocity.
arxiv +1 more source
Gaseous Vortices in Barred Spiral Galaxies [PDF]
The Astrophysical Journal, 2000 Simulations of the gas flow in a variety of two-dimensional barred spiral galaxies have shown that vortices in the gas appear, when viewed from above, in the corotation frame of the bar. These low-density vortices generally appear at or near the L4 and L5 Lagrangian points.
Martin N. England +2 more
openalex +3 more sources
Bar pattern speeds in CALIFA galaxies III. Solving the puzzle of ultrafast bars [PDF]
A&A 649, A30 (2021), 2021 More than 10% of the barred galaxies with a direct measurement of the bar pattern speed host an ultrafast bar. These bars extend beyond the corotation radius and challenge our understanding of the orbital structure of barred galaxies. Most of them are found in spiral galaxies, rather than in lenticular ones.
arxiv +1 more source
AGN spiral galaxies in groups: effects of bars [PDF]
Astronomy & Astrophysics, 2014 10 pages, 10 figures.
Sol Alonso +6 more
openaire +4 more sources
The Wolf-Rayet population of the nearby barred spiral galaxy NGC 5068 uncovered by VLT and Gemini [PDF]
, 2011 We present a narrow-band VLT/FORS1 imaging survey of the SAB(rs)cd spiral galaxy NGC 5068, located at a distance of 5.45Mpc, from which 160 candidate Wolf-Rayet sources have been identified, of which 59 cases possess statistically significant 4686 ...
J. Bibby, P. Crowther
semanticscholar +1 more source
How the bar properties affect the induced spiral structure [PDF]
, 2021 Stellar bars and spiral arms co-exist and co-evolve in most disc galaxies in the local Universe. However, the physical nature of this interaction remains a matter of debate. In this work, we present a set of numerical simulations based on isolated galactic models aimed to explore how the bar properties affect the induced spiral structure.
arxiv +1 more source
STAR FORMATION EFFICIENCY IN THE BARRED SPIRAL GALAXY NGC 4303 [PDF]
, 2010 We present new 12CO (J = 1 − 0) observations of the barred galaxy NGC 4303 using the Nobeyama 45 m telescope (NRO45) and the Combined Array for Research in Millimeter-wave Astronomy (CARMA).
R. Momose +3 more
semanticscholar +1 more source
TESTING THEORIES IN BARRED-SPIRAL GALAXIES [PDF]
The Astrophysical Journal, 2011 According to one version of the recently proposed "manifold" theory that explains the origin of spirals and rings in relation to chaotic orbits, galaxies with stronger bars should have a higher spiral arms pitch angle when compared to galaxies with weaker bars.
openaire +3 more sources
Molecular Bars in Spiral Galaxies [PDF]
International Astronomical Union Colloquium, 1996 Images of molecular gas in spiral galaxies show two types of bar structure: large-scale bars, which are correlated with the presence of stellar bars, and generally follow the spiral structure, and nuclear “bars” of a few hundred parsecs in size, which show no direct correlation with the presence of a stellar bar.
openaire +2 more sources
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