The Structure of Barred Galaxies
نویسندگان
چکیده
منابع مشابه
Barred Galaxies
Theoretical studies suggest that large-scale stellar bars can be highly effective in delivering gas to the central few hundred parsecs of a spiral galaxy, which may then initiate rapid star formation. Further instabilities may lead to additional inflow to physical scales relevant for active galactic nuclei. We test these predictions in light of recent observations. Compared to unbarred spirals,...
متن کاملObservations of Barred Galaxies
We review general observational properties of bars in galaxies, and relations between bars, their dynamics, and (circum)nuclear activity. We consider new measurements of bar fractions and of the distribution of bars with host type, bar strength, and bar pattern speeds. Bars redistribute material radially, leading to flattened abundance gradients and a diminished degree of disk-wide two-fold sym...
متن کاملDynamics of Barred Galaxies
Some 30% of disc galaxies have a pronounced central bar feature in the disc plane and many more have weaker features of a similar kind. Kinematic data indicate that the bar constitutes a major non-axisymmetric component of the mass distribution and that the bar pattern tumbles rapidly about the axis normal to the disc plane. The observed motions are consistent with material within the bar strea...
متن کاملStructure and kinematics of candidate double - barred galaxies . ⋆
Results of optical and NIR spectral and photometric observations of a sample of candidate double-barred galaxies are presented. Velocity fields and velocity dispersion maps of stars and ionized gas, continuum and emission-line images were constructed from integral-field spectroscopy observations carried out at the 6m telescope (BTA) of SAO RAS, with the MPFS spectrograph and the scanning Fabry-...
متن کاملDouble-Barred Galaxies
I present a brief review of what is known about double-barred galaxies, where a small (“inner”) bar is nested inside a larger (“outer”) bar; the review is focused primarily on their demographics and photometric properties. Roughly 20% of S0–Sb galaxies are doublebarred; they may be rarer in later Hubble types. Inner bars are typically ∼500 pc in radius (∼12% the size of outer bars), but sizes r...
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ژورنال
عنوان ژورنال: Europhysics News
سال: 1990
ISSN: 0531-7479,1432-1092
DOI: 10.1051/epn/19902101003