Relations among structural parameters in barred galaxies with a direct
  measurement of bar pattern speed
  We investigate the relations between the properties of bars and their host
galaxies in a sample of 77 nearby barred galaxies, spanning a wide range of
morphological types and luminosities, with 34 SB0-SBa and 43 SBab-SBc galaxies.
The sample includes all the galaxies with reliable direct measurement of their
bar pattern speed based on long-slit or integral-field stellar spectroscopy
using the Tremaine-Weinberg method. We limited our analysis to the galaxies
with a relatively small relative error on the bar pattern speed (smaller than
50 per cent) and not hosting an ultrafast bar. For each galaxy, we collected
the radius, strength, pattern speed, corotation radius, and rotation rate for
the bar and we also collected the Hubble type and absolute SDSS r-band
magnitude. We also used literature bulge-to-total luminosity ratio for a
subsample of 53 galaxies with an available photometric decomposition. We
confirmed earlier observational findings that longer bars rotate with lower bar
pattern speeds, shorter bars are weaker, and bars with a small bar rotation
rate rotate with higher bar pattern speeds and have smaller corotation radii.
In addition, we found that stronger bars rotate with lower bar pattern speeds,
as predicted from the interchange of angular momentum during bar evolution,
which in turn may depend on different galaxy properties. Moreover, we report
that brighter galaxies host longer bars, which rotate with lower bar pattern
speeds and have larger corotation radii. This result is in agreement with a
scenario of downsizing in bar formation, if more massive galaxies formed
earlier and had sufficient time to slow down, grow in length, and push
corotation outwards.
