Measuring the Bar Pattern Speed for Galaxies with Nuclear Rings
PI:
Yun Hee Lee
Co-I(s):
Ho Seong Hwang, Virginia Cuomo, Narae Hwang, Ji Yeon Seok, Myeong-Gu Park, Taehyun Kim, Hong Bae Ann, Woong-Tae Kim
Abstract
We propose GMOS/long-slit observations to measure the bar pattern speed of five barred galaxies, wherein the nuclear rings have been resolved using the HST. We will obtain the line-of-sight velocity distribution from five aligned slits per target and derive the pattern speed using the Tremaine and Weinberg method. This observation will be used to determine the resonance radii by combining the epicyclic frequency curve calculated from PS1 photometry. Specifically, we will use these observation results to investigate the relation between the nuclear ring and the inner Lindblad resonance. By combining the sample of Lee et al. (2022, z < 0.15), we aim to ultimately verify (1) whether the relation between ring radii and resonance radii varies depending on the evolutionary stage of bars, and (2) whether the ring positions are determined by the resonance or by the bar strength and the mass concentration in observations.