منابع مشابه
Galaxy Zoo: Bars in Disk Galaxies
We present first results from Galaxy Zoo 2, the second phase of the highly successful Galaxy Zoo project (www.galaxyzoo.org). Using a volume–limited sample of 13665 disk galaxies (0.01 < z < 0.06 and Mr < −19.38), we study the fraction of galaxies with bars as a function of global galaxy properties like colour, luminosity and bulge prominence. Overall, 29.4 ± 0.5% of galaxies in our sample have...
متن کاملGas flows and bars in galaxies
Dynamical evolution of spiral galaxies is strongly dependent on nonaxisymmetric patterns that develop from gravitational instabilities, either spontaneously or externally triggered. Some evolutionary sequences are described through which a galaxy could possibly concentrate mass and build bulges, how external gas accretion from cosmic filaments could be funneled to the galaxy disks, and intermit...
متن کاملDeficiency of "Thin" Stellar Bars in Seyfert Host Galaxies.
Using all available major samples of Seyfert galaxies and their corresponding closely matched control samples of nonactive galaxies, we find that the bar ellipticities (or axial ratios) in Seyfert galaxies are systematically different from those in nonactive galaxies. Overall, there is a deficiency of bars with large ellipticities (i.e., "thin" or "strong" bars) in Seyfert galaxies compared to ...
متن کاملEnhanced Star Formation - the Importance of Bars in Spiral Galaxies
We have found that amongst an IR-luminous subset of nearby spiral galaxies, nearly all of the systems with IRAS colours and luminosities indicative of enhanced star formation are barred. Radio continuum and IR-spectroscopic results support the hypothesis that this emission originates within the central 2kpc; possibly in a circumnuclear ring. We also find that outer rings are over-represented am...
متن کاملMorphology of Cold Bars in Early and Late Type Galaxies
We compare stellar orbits in an early (NGC 4314) and a late-type barred galaxy (NGC 1073). We find that these bars are cold in the sense that the majority of stars can be described as being nearby to periodic orbits. We place limits of (65km/s) and (50km/s) on the components of the diagonalized velocity dispersion ellipsoid matrix for stars in the bars of NGC 4314 and NGC 1073 respectively. Bot...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2004
ISSN: 0074-1809
DOI: 10.1017/s0074180900183354