Mosaicked images and spectra of J = 1 → 0 HCN and HCO+ emission from comet Hale-Bopp (1995 O1)

M. C.H. Wright*, I. De Pater, J. R. Forster, Patrick Palmer, Lewis E. Snyder, J. M. Veal, Michael F. A'Hearn, L. M. Woodney, William M. Jackson, Y. J. Kuan, A. J. Lovell

*此作品的通信作者

    研究成果: 雜誌貢獻期刊論文同行評審

    30 引文 斯高帕斯(Scopus)

    摘要

    We used the BIMA array to map comet Hale-Bopp (1995 O1) in HCN and HCO+ emission at 89 GHz with 10″ angular resolution. The mosaicked images with seven pointing centers were combined with single-dish data to form completely sampled images of a region ∼ 4′ in diameter. The HCN image is roughly compatible with a Haser model in which most of the HCN comes from the nucleus. However, clear deviations from circular symmetry are present, and roughly 20% of the HCN does not appear to come from the nuclear source. Frequently, the HCN has an asymmetric, double-peaked profile. The double peak is expected from the Haser model, and the asymmetry observed on April 3 could come from an increased gas production toward the Sun and facing the observer. The abundance of HCN relative to H2O is ∼ 0.3%. The HCO+, in contrast, is smooth, almost completely resolved in the interferometer observations, and offset toward the ion tail by about 1′. This behavior is compatible with expectations from a simple scaling of previous work.

    原文英語
    頁(從 - 到)3018-3028
    頁數11
    期刊Astronomical Journal
    116
    發行號6
    DOIs
    出版狀態已發佈 - 1998 十二月

    ASJC Scopus subject areas

    • 天文和天體物理學
    • 空間與行星科學

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