Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC1300 and NGC5383

作者：Maeda Fumiya^*; Ohta Kouji; Fumom Yusuke; Habe Asao; Baba Junichi

来源：Publications of the Astronomical Society of Japan, 2018, 70(3): 37.

DOI：10.1093/pasj/psy028

• galaxies: individual (NGC 1300, NGC 5383)
• galaxies: ISM
• galaxies: star formation

We carried out (CO)-C-12(J = 1-0) observations toward bar and arm regions of the strongly barred galaxies NGC1300 and NGC5383 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 highresolution 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.

• 出版日期2018-6