Program: GN-2022A-Q-107

We propose GMOS/IFS observations to directly measure the bar pattern speed of three barred galaxies at z = 0.12-0.41, which would be the first direct measurement of the bar pattern speed beyond the local universe. We will obtain the line-of-sight velocity distribution of the three barred galaxies from the IFS observations and derive the pattern speed using the Tremaine and Weinberg method. This observation will be used to examine the reliability of the bar pattern speed indirectly measured from photometry for the galaxies at 0.1<z<0.8 (Perez et al. 2012), which is an important sample for the study of evolution of barred galaxies. We then use the bar pattern speed to classify barred galaxies for the full sample of Perez et al. (2012) into different evolutionary stages (i.e. fast, medium, and slow bars) using the frequency curves as a function of galactocentric radius. The results will be combined with those for the galaxies in the local universe from Lee et al. (2021), which will provide important hints for the understanding of the bar evolution in spiral galaxies over the last 8 Gyr.