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    National Tsing Hua University Institutional Repository > 理學院 > 天文研究所 > 期刊論文 >  Shock interactions between Sgr A East and its environments


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53970


    Title: Shock interactions between Sgr A East and its environments
    Authors: Lee, Sungho;Pak, Soojong;Geballe, T. R.;Lee, Sang-Gak;Davis, Christopher J.;Choi, Minho;Minh, Y. C.;Herrnstein, Robeson M.;Ho, Paul T. P.
    教師: 賀曾樸
    Date: 2006
    Publisher: Institute of Physics
    Relation: Galactic Center Workshop 2006: From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei,Book Series: JOURNAL OF PHYSICS CONFERENCE SERIES,Volume: 54,Pages: 22-28,Published: 2006
    Keywords: GIANT MOLECULAR CLOUDS
    GALACTIC-CENTER
    MASSIVE STARS
    EMISSION
    Abstract: We have surveyed the interaction regions between Sgr A East and the surrounding molecular clouds in the H2 1-0 S(l) (2.1218 μm) line emission. The resulting data cube shows the distribution of the H2 emission both in space (with a resolution of about 2 arcsec) and in velocity (with a resolution of about 18 km s−1). Our data are compared with NH3(3,3) data from radio observations to investigate the gas kinematics. Based on the H2 1-0 S(l) line's intensity, its ratio to H2 2 - 1 S(1), and its gas kinematics, we conclude that the emitting H2 is excited by strong molecular shocks. We estimate shock velocities ( 100 km s−1) by comparing the H2 line profles with those of NH3, and derive an initial explosion energy of 0.2 − 4 × 1053 ergs. Such a high energy excludes a single normal supernova for the origin of Sgr A East. We examine other hypotheses, including the tidal disruption of a star by the supermassive black hole (Sgr A*), multiple supernovae, and a hypernova. We suggest that a hypernova, which is believed to originate from a collapsar or microquasar, is the most probable origin.
    URI: http://www.iop.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53970
    Appears in Collections:[天文研究所] 期刊論文

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