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    National Tsing Hua University Institutional Repository > 理學院 > 天文研究所 > 期刊論文 >  The contracting molecular cores e1 and e2 in W51


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53962


    Title: The contracting molecular cores e1 and e2 in W51
    Authors: Ho PTP;Young LM
    教師: 賀曾樸
    Date: 1996
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL,Volume: 472,Issue: 2,Pages: 742-754,Part: Part 1,Published: DEC 1 1996
    Keywords: STAR-FORMING REGION
    H-II-REGIONS
    H2O MASER SOURCES
    PROPER MOTIONS
    Abstract: We report on observations of the star-forming region W51 in the NH3 (J, K)=(1, 1) and (2, 2) transitions at 1.3 cm. These observations have much greater sensitivity than our previous observations and they allow a kinematic analysis of the motions of the gas in two small star-forming cores. We present evidence for radial contraction of the gas in W51 e2 onto a young star and possibly also for similar contraction near W51 el. The H II region/molecular core W51 e2 seems to be in a stage where the central star has already arrived on the main sequence, whereas the cooler gas on scales of 0.1-0.2 pc is still. contracting onto the mass concentration at the center. In contrast to the interpretation of Rudolph et al., we propose that the contraction extends only over a few tenths of a parsec near e2 instead of over the entire W51 molecular cloud complex
    URI: http://aas.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53962
    Appears in Collections:[天文研究所] 期刊論文

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