Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC1300 and NGC5383
Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC1300 and NGC5383
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分子气体在强棒星系 NGC1300 和 NGC5383 棒中的高速色散
DOI：
10.1093/pasj/psy028
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发表时间：
2018
影响因子：
2.3
通讯作者：
Baba Junichi
中科院分区：
文献类型：
--
作者：
Maeda Fumiya;Ohta Kouji;Fujimoto Yusuke;Habe Asao;Baba Junichi
我们用野边山45米射电望远镜（束径1-2千秒差距）对强棒星系NGC 1300和NGC 5383的棒区和臂区进行了CO（J= 1-0）观测。观测的目的是根据最近的高分辨率数值模拟，定性地研究一种抑制棒中星星形成的新情景：与臂区相比，棒区分子云之间的高速碰撞抑制了大质量星星的形成。CO排放量检测到从所有的区域，表明分子气体的存在下，没有关联的清晰H II区域的强酒吧。在这两个星系中，CO线轮廓的速度宽度往往是更大的酒吧区比在臂区，这是定性的新的情况下一致。
We carried outCO(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 clearH IIregions. 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.