Results 1 to 10 of about 153,822 (90)
The Local Galaxy Density and the Bars of Spiral Galaxies [PDF]
The Astrophysical Journal, 1993 Using a variety of parameters of local galaxy density, we have examined the effects of the environmental density on the presence of bar structures in spiral galaxies of various morphological types. For an extensive sample of nearby galaxies, listed in the ``Nearby Galaxies Catalogue'' (Tully, 1988a), we have found that the spirals characterized by a ...
GIURICIN G +3 more
arxiv +5 more sources
Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Non-barred Spiral Galaxies [PDF]
Publ.Astron.Soc.Jap.59:117-166,2007, 2007 The data from a CO(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 in the range Sa to Scd, (2) distance less than 25 Mpc, (3) inclination angle less than 79deg (RC3), (4) flux at 100 um higher than ~ 10 Jy, (5) spiral ...
Hiroyuki Nakanishi +9 more
arxiv +5 more sources
The Distribution of Bar and Spiral Strengths in Disk Galaxies [PDF]
Astron.J.130:506-523,2005, 2005 The distribution of bar strengths in disk galaxies is a fundamental property of the galaxy population that has only begun to be explored. We have applied the bar/spiral separation method of Buta, Block, and Knapen to derive the distribution of maximum relative gravitational bar torques, Q_b, for 147 spiral galaxies in the statistically well-defined ...
Heikki Salo +3 more
arxiv +5 more sources
Formation Mechanisms for Spirals in Barred Galaxies [PDF]
Astron.Lett. 27 (2001) 421-439, 2000 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 +1 more
arxiv +5 more sources
Barred spiral galaxies in modified gravity theories [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT When bars form within galaxy formation simulations in the standard cosmological context, dynamical friction with dark matter (DM) causes them to rotate rather slowly. However, almost all observed galactic bars are fast in terms of the ratio between corotation radius and bar length.
Mahmood Roshan +7 more
openaire +7 more sources
The profiles of bars in spiral galaxies
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT We present an analysis of major-axis surface-brightness profiles of bars in a volume-limited sample of 182 barred spiral galaxies, using Spitzer 3.6 $\mu$m images. Unlike most previous studies, we use the entire bar profile, and we classify profiles into four categories.
Peter Erwin +2 more
openaire +2 more sources
ON THE FRACTION OF BARRED SPIRAL GALAXIES [PDF]
The Astrophysical Journal, 2010 We investigate the stellar masses of strongly barred spiral galaxies. Our analysis is based on a sample of ~14000 visually-classified nearby galaxies given in Nair & Abraham 2010(a). The fraction of barred spiral galaxies is found to be a strong function of stellar mass and star formation history, with a minimum near the characteristic mass at ...
Preethi Nair, Roberto Abraham
openaire +4 more sources
Stellar diffusion in barred spiral galaxies [PDF]
Astronomy & Astrophysics, 2011 11 pages, 9 figures, accepted for publication in Astron ...
Brunetti M., Chiappini C, Pfenniger D.
openaire +4 more sources
Asymptotic orbits in barred spiral galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We study the formation of the spiral structure of barred spiral galaxies, using an $N$-body model. The evolution of this $N$-body model in the adiabatic approximation maintains a strong spiral pattern for more than 10 bar rotations. We find that this longevity of the spiral arms is mainly due to the phenomenon of stickiness of chaotic orbits close to ...
Constantinos Kalapotharakos +2 more
openaire +4 more sources
Dynamical rules for barred spiral galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 1985 Des integrations numeriques des orbites-2D demontrent que la famille principale d'orbites periodiques dans les forts potentiels barres est la famille parallele prograde. Toutes les autres familles ont des distributions de la densite des orbites qui sont incompatibles avec le potentiel impose.
Robert Sanders, Pj Teuben
openaire +3 more sources