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    National Tsing Hua University Institutional Repository > 理學院 > 天文研究所 > 期刊論文 >  Structure and kinematics of CO J=2-1 emission in the central region of NGC 4258


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53940


    Title: Structure and kinematics of CO J=2-1 emission in the central region of NGC 4258
    Authors: Sawada-Satoh, S.;Ho, P. T. P.;Muller, S.;Matsushita, S.;Lim, J.
    教師: 賀曾樸
    Date: 2007
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL,Volume: 658,Issue: 2,Pages: 851-858,Part: Part 1,Published: APR 1 2007
    Keywords: SPIRAL GALAXY NGC-4258
    NGC 4258
    ANOMALOUS ARMS
    MOLECULAR GAS
    Abstract: We present (CO)-C-12 J=2-1 observations toward the central region of the type 2 Seyfert galaxy NGC 4258 with the Submillimeter Array (SMA). Our interferometric maps show two armlike elongated components along the major axis of the galaxy, with no strong nuclear concentration. The CO(2-1) morphology and kinematics are similar to previous CO(1-0) results. The velocity field of the components agrees with the general galactic rotation, except for the east elongated component, which shows a significant velocity gradient along the east-west direction. In order to account for the velocity field, we propose a kinematical model in which the warped rotating disk is also expanding. The line ratio of CO(2-1)/CO(1-0) reveals that the eastern component with the anomalous velocity gradient appears to be warmer and denser. This is consistent with the gas in this component being closer to the center, being heated by the central activities, and possibly interacting with expanding motions from the nuclear region
    URI: http://aas.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53940
    Appears in Collections:[天文研究所] 期刊論文

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