XDR Chemistry in the Circumnuclear Disk of NGC 1068

A. Usero, S. Garcia-Burillo, A. Fuente, J. Martin-Pintado

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    We have studied the feedback in°uence that the central engine of the Seyfert 2 galaxy NGC 1068 may have on the chemistry of the 200 pc circumnuclear gas disk (CND). With this purpose, we have conducted a multispecies/ multi-transition survey of molecular gas in the CND of NGC 1068 using the IRAM 30m telescope. Abundances of several molecular species have been estimated, including HCN, CN, CS, HCO+, SiO and HOC+. We report on the detection of signi¯cant SiO emission in this galaxy, as well as on the ¯rst extragalactic detection of the active radical HOC+. We conclude that the chemistry of the molecular gas reservoir in the CND can be best explained in the framework of X-ray Dominated Region (XDR) models.
    Original languageEnglish
    Title of host publicationIn: The Neutral ISM in Starburst Galaxies - ASP Conf Series 320
    PublisherAstronomical Society of the Pacific
    ISBN (Print)1-58381-182-6, 978-1-58381-255-6
    Publication statusPublished - 2004


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