Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC 1300 and NGC 5383

PASJ: Publications of the Astronomical Society of Japan

Habe, Asao¹  Maeda, Fumiya²  Ohta, Kouji²  Baba, Junichi³  Fujimoto, Yusuke⁵ 

[1] Astrophysics, Australian National University, Canberra, ACT 2611, Australia;Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan;Graduate School of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;National Astronomical Observatory of Japan (NAOJ), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Research School of Astronomy &

关键词: galaxies: individual;    galaxies: ISM;    galaxies: star formation;   

DOI  :  10.1093/pasj/psy028

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We carried out |$\sf ^{12}$|CO(J = 1–0) observations toward bar and arm regions of the strongly barred galaxies NGC 1300 and NGC 5383 with the Nobeyama 45 m radio telescope (beam size of 1–2 kpc in the galaxies). The aim of the observations is to qualitatively examine a new scenario for the suppression of star formation in bars based on recent high-resolution numerical simulations: higher speed collisions between molecular clouds in the bar region compared with the arm region suppress the massive star formation. CO emissions were detected from all the regions, indicating the presence of molecular gases in the strong bars without associating clear H II regions. In both galaxies, the velocity width of the CO line profile tends to be larger in the bar region than in the arm region, which is qualitatively consistent with the new scenario.

【 授权许可】

CC BY