Interstellar CH3CCD

A. J. Markwick, S. B. Charnley, H. M. Butner, T. J. Millar

    Research output: Contribution to journalArticlepeer-review


    We report the detection of a new interstellar molecule: CH3CCD, a deuterated isotopomer of methyl acetylene. Analysis of lines detected at seven positions along the ridge of the dark cloud TMC-1 indicates that the CH 3CCD column density and fractionation exhibit strong spatial gradients, with D/H ratios ranging from a minimum of 0.04 at the cyanopolyyne peak (CP) position to as high as 0.18. We find that the column density in CH2DCCH is almost constant along the ridge, whereas that of CH 3CCD increases and that of CH3CCH decreases in moving away from the CP. Chemical mechanisms that may explain the observed fractionation trends in CH3CCD and CH2DCCH are briefly discussed. © 2005. The American Astronomical Society. All rights reserved.
    Original languageEnglish
    Pages (from-to)L117-L120
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 10 Jul 2005


    • ISM: abundances
    • ISM: individual (Taurus Molecular Cloud)
    • ISM: molecules


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