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  • exploring morphological correlations among h2co, 12co, msx and continuum mappings

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1004
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     there are relatively few h2co mappings of large-area giant molecular cloud (gmcs). h2co absorption lines are good tracers for low-temperature molecular clouds towards star formation regions. thus, the aim of the study was to identify h2co distributions in ambient molecular clouds. we investigated morphologic relations among 6-cm continuum brightness temperature (cbt) data and h2co (111−110; nanshan 25-m radio telescope), 12co (1–0; 1.2-m cfa telescope) and midcourse space experiment (msx) data, and considered the impact of background components on foreground clouds. we report simultaneous 6-cm h2co absorption lines and h110α radio recombination line observations and give several large-area mappings at 4.8 ghz toward w49 (50′×50′), w3 (70′×90′), dr21/w75 (60′×90′) and ngc2024/ngc2023 (50′×100′) gmcs. by superimposing h2co and 12co contours onto the msx color map, we can compare correlations. the resolution for h2co, 12co and msx data was ∼10′, ∼8′ and ∼18.3′, respectively. comparison of h2co and 12co contours, 8.28-μm msx colorscale and cbt data revealed great morphological correlation in the large area, although there are some discrepancies between 12co and h2co peaks in small areas. the ngc2024/ngc2023 gmc is a large area of hii regions with a high cbt, but a h2co cloud to the north is possible against the cosmic microwave background. a statistical diagram shows that 85.21% of h2co absorption lines are distributed in the intensity range from −1.0 to 0 jy and the δv range from 1.206 to 5 km s−1.

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