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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Discovery of a distant molecular cloud in the extreme outer Galaxy with the Nobeyama 45 m telescope
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Discovery of a distant molecular cloud in the extreme outer Galaxy with the Nobeyama 45 m telescope

机译：用NobeMaMA 45 M望远镜发现极端外层银河系中的遥远分子云

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摘要

We report the discovery of a molecular cloud whose kinematic distance is the largest in the Galaxy at the present moment, named G213.042+0.003, at l = 213 degrees.042 and b = 0 degrees.003 in the (CO)-C-12(J = 1-0) line using the Nobeyama 45 m telescope and the BEARS multibeam receiver. This molecular cloud is located at a heliocentric distance of 21(-7)(+12) kpc and Galactocentric distance of 29(-7)(+12) kpc, which are estimated as the kinematic distances with the Galactic parameters obtained by Reid et al. (2014, ApJ, 783, 130). Its major and minor diameters and line width were measured to be 4.0(-1.3)(+2.3) pc, 3.0(-1.0)(+1.7) pc, and 1.5 km s(-1), respectively. The cloud mass was estimated to be 2.5(-1.4)(+3.7) x 10(2) M-circle dot using the CO-to-H-2 conversion factor of 5.6 x 10(20) cm(-2) (K km s(-1))(-1) obtained in the far outer Galaxy.
机译：我们报告了一个分子云的发现，它的运动距离是目前银河系中最大的，名为G213。042+0.003，l=213度。042和b=0度。003在（CO）-C-12（J=1-0）线上使用Nobeyama 45米望远镜和BEARS多波束接收器。该分子云位于21（-7）（+12）kpc的日心距离和29（-7）（+12）kpc的银河中心距离处，根据Reid等人（2014，ApJ，783，130）获得的银河系参数估算为运动距离。它的大直径、小直径和线宽分别为4.0（-1.3）（+2.3）pc、3.0（-1.0）（+1.7）pc和1.5 km s（-1）。根据在遥远的外星系中获得的5.6 x 10（20）cm（-2）（kkm-s（-1））（-1）的CO-to-H-2转换因子，云质量估计为2.5（-1.4）（+3.7）x 10（2）M圆点。

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  • 作者

    Matsuo Mitsuhiro; Nakanishi Hiroyuki; Minamidani Tetsuhiro; Torii Kazufumi; Saito Masao; Kuno Nario; Sawada Tsuyoshi; Tosaki Tomoka; Kobayashi Naoto; Yasui Chikako; Mito Hiroyuki; Hasegawa Takashi; Hirota Akihiko;

  • 作者单位

    Kagoshima Univ Grad Sch Sci &

    Engn 1-21-35 Korimoto Kagoshima Kagoshima 8900065 Japan;

    Kagoshima Univ Grad Sch Sci &

    Engn 1-21-35 Korimoto Kagoshima Kagoshima 8900065 Japan;

    Natl Inst Nat Sci Natl Astron Observ Japan Nobeyama Radio Observ Minamisa Ku 462-2 Nobeyama Minamimaki Nagano 3841305 Japan;

    Natl Inst Nat Sci Natl Astron Observ Japan Nobeyama Radio Observ Minamisa Ku 462-2 Nobeyama Minamimaki Nagano 3841305 Japan;

    Natl Inst Nat Sci Natl Astron Observ Japan Nobeyama Radio Observ Minamisa Ku 462-2 Nobeyama Minamimaki Nagano 3841305 Japan;

    Univ Tsukuba Grad Sch Pure &

    Appl Sci 1-1-1 Tennodai Tsukuba Ibaraki 3058577 Japan;

    Joint ALMA Off Alonso de Cordova 3107 Santiago 7630355 Chile;

    Joetsu Univ Educ Yamayashiki Machi Niigata 9438512 Japan;

    Univ Tokyo Inst Astron Sch Sci 2-21-1 Osawa Mitaka Tokyo 1810015 Japan;

    Natl Astron Observ Japan 2-21-1 Osawa Mitaka Tokyo 1818588 Japan;

    Univ Tokyo Sch Sci Inst Astron Kiso Observ 10762-30 Mitake Kiso Nagano 3970101 Japan;

    Gunma Astron Observ 6860-86 Nakayama Gunma 3770702 Japan;

    Joint ALMA Off Alonso de Cordova 3107 Santiago 7630355 Chile;

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  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

    ISM: clouds; ISM:molecules; radio lines: ISM;

    机译：姓名：克劳德;名称：Hollers;无线电Lenes：名称;

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