Bibcode
Seidel, M. K.; Falcón-Barroso, J.; Martínez-Valpuesta, I.; Díaz-García, S.; Laurikainen, E.; Salo, H.; Knapen, J. H.
Bibliographical reference
Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields. Proceedings of a conference held at Teatro Circo de Marte, Santa Cruz de La Palma, Canary Islands, Spain on 2-6 March 2015. Edited by Ian Skillen, Marc Barcells, and Scott Trager. ASP Conference Series, Vol. 507. San Francisco: Astronomical Society of the Pacific, 2016, p.265
Advertised on:
10
2016
Citations
0
Refereed citations
0
Description
Using the BaLROG (Bars in Low Redshift Optical Galaxies) sample of 16
morphologically distinct barred spirals, we constrain the influence of
bars on nearby galaxies observationally. Our sample appears small
compared to ongoing IFU surveys, but offers a tenfold sharper spatial
resolution (˜100 pc) as each galaxy is a mosaic of several
pointings observed with the IFU spectrograph SAURON. We demonstrate a
correlation between the bar strength Qb determined from
classical torque analysis using 3.6 μm Spitzer (S4G)
images, with Qkin, a kinematic torque, calculated via our new
method based solely on the kinematics. Using a large number of
N-body simulations, we verify this correlation and the measurement
of Qb. We also determine bar strengths from ionized gas
kinematics and find that they are ˜2.5 larger than those measured
from stellar kinematics. Further, inner kinematic features related to
bars as predicted by simulations seem to be stronger for stronger bars.
We find a stellar angular momentum dip at 0.2±0.1 bar
lengths. In these central regions, about half of our sample also
exhibits an anti-correlation of h3 - stellar velocity
(v/σ). An increased flattening of the stellar σ gradient
with increasing bar strength supports the notion of bar-induced orbit
mixing. Our results constrain the spatial scales and magnitude of a
kinematic influence of bar-driven secular evolution in present day
galaxies.