Oral Presentation

Suppression of star formation at the center of barred spiral galaxies

Author(s): Takashi Yamamoto (University of Tsukuba), Daisuke Iono (National Astronomical Observatory of Japan), Toshiki Saito (Shizuoka University), Nario Kuno (University of Tsukuba)

Presenter: Takashi Yamamoto (University of Tsukuba)

A CAS analysis (Conselice 2003) of CO(2-1) data images of 73 galaxies from PHANGS-ALMA yielded significant results. One result is that barred spiral galaxies have relatively higher central concentrations of molecular gas than non-barred spiral galaxies. We also performed the same analysis on Hα data images of 19 galaxies in PHANGS-MUSE. We found four barred spiral galaxies with a high Concentration index in CO(2-1) and a low Concentration index in Hα. This analysis suggests that star formation is suppressed in the center of these barred spiral galaxies. It may be an important insight into the evolution of nearby galaxies. This issue will be discussed in detail.