NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T15:33:30 PDT
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For refcode 2013ApJ...768..151V:
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...768..151V Galaxy Interactions in Compact Groups. I. The Galactic Winds of HCG16 Vogt, Frederic P. A.; Dopita, Michael A.; Kewley, Lisa J. Abstract. Using the WiFeS integral field spectrograph, we have undertaken a series of observations of star-forming galaxies in compact groups. In this first paper dedicated to the project, we present the analysis of the spiral galaxy NGC 838, a member of the Hickson Compact Group 16, and of its galactic wind. Our observations reveal that the wind forms an asymmetric, bipolar, rotating structure, powered by a nuclear starburst. Emission line ratio diagnostics indicate that photoionization is the dominant excitation mechanism at the base of the wind. Mixing from slow shocks (up to 20%) increases further out along the outflow axis. The asymmetry of the wind is most likely caused by one of the two lobes of the wind bubble bursting out of its H I envelope, as indicated by line ratios and radial velocity maps. The characteristics of this galactic wind suggest that it is caught early (a few Myr) in the wind evolution sequence. The wind is also quite different from the galactic wind in the partner galaxy NGC 839 which contains a symmetric, shock-excited wind. Assuming that both galaxies have similar interaction histories, the two different winds must be a consequence of the intrinsic properties of NGC 838 and NGC 839 and their starbursts. Key words: galaxies: evolution, galaxies: groups: individual: HCG16, galaxies: individual: NGC 838 NGC 839 NGC 848, galaxies: interactions, ISM: jets and outflows
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