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Paper: Bar Strengths and Nuclear Activity
Volume: 249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection
Page: 183
Authors: Laurikainen, Eija; Salo, Heikki; Rautiainen, Pertti
Abstract: The strength of the non-axisymmetric force field (tangential force normalized to the mean radial force) is calculated for a sample of 109 active and non-active galaxies using JHK images of the Two Micron All Sky Survey (2MASS). This is an important improvement on earlier statistical studies of bar strengths because, instead of visual estimates of bar lengths and shapes, actual forces are analyzed. No correlation was found, for example, between the maximum non-axisymmetric force and the bar length. We found that active nuclei (Sy + LINER+ H ii) avoid bars with large non-axisymmetric forces in the inner disk. This is related to the Hubble type in the sense that favorable conditions for activity are generally met in early-type spirals, probably due to their larger bulges, which may affect the inner parts of the galaxy. However, nuclear activity appears also in some late-type spirals with similar non-axisymmetric forces to those in early-type galaxies.
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