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Date and Time of the Query: 2019-05-19 T00:14:30 PDT
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For refcode 2015MNRAS.451..936S:
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Copyright by Royal Astronomical Society. 2015MNRAS.451..936S The BaLROG project - I. Quantifying the influence of bars on the kinematics of nearby galaxies Seidel, M. K.; Falcon-Barroso, J.; Martinez-Valpuesta, I.; Diaz-Garcia, S.; Laurikainen, E.; Salo, H.; Knapen, J. H. Abstract. We present the BaLROG (Bars in Low Redshift Optical Galaxies) sample of 16 morphologically distinct barred spirals to characterize observationally the influence of bars on nearby galaxies. Each galaxy is a mosaic of several pointings observed with the integral-field unit (IFU) SAURON leading to a tenfold sharper spatial resolution (~100 pc) compared to ongoing IFU surveys. In this paper we focus on the kinematic properties. We calculate the bar strength Q__b from classical torque analysis using 3.6-micron Spitzer (S^4^G) images, but also develop a new method based solely on the kinematics. A correlation between the two measurements is found and backed up by N-body simulations, verifying the measurement of Q__b. We find that bar strengths from ionized gas kinematics are ~2.5 larger than those measured from stellar kinematics and that stronger bars have enhanced influence on inner kinematic features. We detect that stellar angular momentum 'dips' at 0.2 +/- 0.1 bar lengths and half of our sample exhibits an anticorrelation of h_3_-stellar velocity (v/sigma) in these central parts. An increased flattening of the stellar sigma gradient with increasing bar strength supports the notion of bar-induced orbit mixing. These measurements set important constraints on the spatial scales, namely an increasing influence in the central regions (0.1-0.5 bar lengths), revealed by kinematic signatures due to bar-driven secular evolution in present-day galaxies. Key words: techniques: spectroscopic, galaxies: bulges, galaxies: evolution, galaxies: formation, galaxies: kinematics and dynamics, galaxies: structure
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