Bibcode
Seidel, M. K.; Falcón-Barroso, J.; Martínez-Valpuesta, I.; Díaz-García, S.; Laurikainen, E.; Salo, H.; Knapen, J. H.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 451, Issue 1, p.936-973
Advertised on:
7
2015
Citations
38
Refereed citations
34
Description
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-μm Spitzer (S4G) 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 h3-stellar velocity
(v/σ) in these central parts. An increased flattening of the
stellar σ 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.
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