Results 61 to 70 of about 184,560 (234)
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
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
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
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
Spiral arm formation mechanisms: Spiral Structure in Barred galaxies. Observational constraints to spiral arm formation mechanisms [PDF]
MNRAS, 2019, 482, 5362, 2019 A method which we have developed for determining corotation radii, has allowed us to map in detail the radial resonant structures of barred spiral galaxies. Here we have combined this information with new determinations of the bar strength and the pitch angle of the innermost segment of the spiral arms to find relationships between these parameters of ...
arxiv +1 more source
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
A Technique for Separating the Gravitational Torques of Bars and Spirals in Disk Galaxies [PDF]
Astron.J. 126 (2003) 1148, 2003 We describe a Fourier-based method of separating bars from spirals in near-infrared images. The method takes advantage of the fact that a bar is typically a feature with a relatively fixed position angle, and uses the simple assumption that the relative Fourier amplitudes due to the bar decline with radius past a maximum in the same or a similar manner
arxiv +1 more source
Density Waves Inside Inner Lindblad Resonance: Nuclear Spirals in Disk Galaxies [PDF]
, 1999 We analyze formation of grand-design two-arm spiral structure in the nuclear regions of disk galaxies. Such morphology has been recently detected in a number of objects using high-resolution near-infrared observations.
Athanassoula E. +9 more
core +2 more sources
Surface Brighteness Distribrtion of NGC 7755 [PDF]
Journal of Astronomy and Space Sciences, 1992 Isophote map and luminosity profile of the barred spiral galaxy NGC 7755 are obtained from PDS scanning of PAL 0-471 plate. From the isophote map, NGC 7755 can be classified SBbc(r) with asymmetric bar ring. We get several physical parameters (MTo U(R)CB,
Mun-Suk Chun, Seong-Min Sohn
doaj
International Journal of Engineering and Management Sciences, 2018 Recently, it has been suggested that entangled particles may be connected by a wormhole. If that is right, what is the distance between them we have to take into account when applying Newton's law of universal gravitation to these particles?
Sándor Buglyó
doaj +1 more source