R. Buta et al., AN OPTICAL, NEAR-INFRARED, AND KINEMATIC STUDY OF 4 EARLY-TYPE RESONANCE RING GALAXIES, The Astronomical journal (New York), 116(3), 1998, pp. 1142-1162
We present optical and near-infrared surface photometry of four early-
type galaxies considered to have resonance ring phenomena on the basis
of morphology. We also present kinematics and rotation curves for thr
ee of the galaxies. The four galaxies are exceptional examples of reso
nance ring galaxies, and from these observations we derive the charact
eristic light distributions, the colors of the rings, and the near-inf
rared disk mass-to-light ratios. We also deproject the galaxies to exa
mine intrinsic ring shapes and bar/ring alignments. From models of the
rotation curves, we compute the Lindblad precession frequencies to ex
amine resonance locations in the disks of the galaxies. Under the assu
mption that the outer rings and pseudorings seen in these galaxies are
linked to the outer Lindblad resonance, we iind that the inner rings
of the sample galaxies lie near the inner 4:1 resonance and that the s
harp ends of the bars lie on average at only 0.65 times the predicted
radius of corotation.