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    National Tsing Hua University Institutional Repository > 理學院 > 天文研究所 > 期刊論文 >  Hot Molecular Gas in the Galactic Center


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53965


    Title: Hot Molecular Gas in the Galactic Center
    Authors: Herrnstein RM;Ho PTP
    教師: 賀曾樸
    Date: 2002
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL,Volume: 579,Issue: 2,Pages: L83-L86,Part: Part 2,Published: NOV 10 2002
    Keywords: APERTURE SYNTHESIS OBSERVATIONS
    SAGITTARIUS-A COMPLEX
    CENTER REGION
    Abstract: Using the new 23 GHz receivers at the Very Large Array (VLA), we have detected NH3 (6, 6) emission (ν = 25.056025 GHz) from hot (>150 K) molecular clouds in the central 10 pc of the Galaxy. This is the first successful detection of NH3 (6, 6) with the VLA. The brightest emission comes from a region interior to the "circumnuclear disk" (CND), less than 1.5 pc in projected distance from Sagittarius A*. This region does not show molecular emission from lower energy transitions such as NH3 (1, 1) and (2, 2), HCN (1-0), and HCO+ (1-0). Line ratios of NH3 (6, 6) and (3, 3) emission as well as NH3 (6, 6) line widths have peak values within 1.5 pc of Sgr A*, indicating that the gas is physically close to the nucleus. NH3 (6, 6) is also detected toward many features outside the CND observed in NH3 (1, 1), (2, 2), and (3, 3). These features tend to lie along ridges of gas associated with Sgr A East or the massive "molecular ridge" that connects the "20 km s-1" and "50 km s-1" giant molecular clouds
    URI: http://aas.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53965
    Appears in Collections:[天文研究所] 期刊論文

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