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    National Tsing Hua University Institutional Repository > 理學院 > 天文研究所 > 期刊論文 >  Prevalence of galaxy-galaxy interactions in AGN hosts

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53969

    Title: Prevalence of galaxy-galaxy interactions in AGN hosts
    Authors: Lim J;Kuo CY;Tang YW;Greene J;Ho PTP
    教師: 賀曾樸
    Date: 2004
    Relation: Interplay Among Black Holes, Stars and ISM in Galactic Nuclei,Book Series: IAU SYMPOSIUM AND COLLOQUIUM PROCEEDINGS SERIES,Issue: 222,Pages: 455-456,Published: 2004
    Keywords: galaxy-galaxy
    AGN hosts
    Abstract: Studies in optical starlight have failed to reach a consensus on the importance of either galaxy interactions, bars, or nuclear spirals in triggering luminous active galactic nuclei (AGNs). Here, we present the first systematic imaging study of Seyfert (disk) galaxies in the 21-cm line of neutral atomic hydrogen (HI) gas. HI is the most sensitive and enduring tracer of galaxy interactions, and can reveal tidal features not otherwise visible in optical starlight. Our sample comprises all twenty-eight galaxies in the Wron-Cetty & Veron (1998) catalog with nuclear magnitudes -19 >= M-B > -23 (including Seyfert, LINER, and HII galaxies) at 0.015 <= z <= 0.017 in the northern hemisphere, and a matched control sample of twenty-seven inactive galaxies at z approximate to 0.008. We have detected nearly all the galaxies observed, and find a much higher incidence of tidal interactions-usually not seen in optical starlight-among the Seyfert galaxies by comparison with the matched control sample. Those Seyferts with uncertain or no clear tidal features show disturbed HI morphologies and/or kinematics, as well as HI companion galaxies, more frequently than the control sample. Our study suggests that the undisturbed optical appearence of active galaxies may be deceptive, and imply that galaxy-galaxy interactions trigger a significant fraction luminous AGNs at low redshifts. The majority of the Seyfert galaxies in our sample appear to be at a relatively early stage of an encounter rather than late in a merger.
    URI: http://journals.cambridge.org/action/stream?pageId=2488&sessionId=A18E00BE7E9E62EFA33BA8C7DECC1105.tomcat1
    Appears in Collections:[天文研究所] 期刊論文

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