NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-19 T07:46:44 PDT
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For refcode 2015MNRAS.454.1404S:
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NED Abstract

Copyright by Royal Astronomical Society. 2015MNRAS.454.1404S The 'shook up' galaxy NGC 3079: the complex interplay between H I, activity and environment Shafi, N.; Oosterloo, T. A.; Morganti, R.; Colafrancesco, S.; Booth, R. Abstract. We present deep neutral hydrogen (H I) observations of the starburst/Seyfert galaxy NGC 3079 and its environment, obtained with the Westerbork Synthesis Radio Telescope. Our observations reveal previously unknown components, both in H I emission and in absorption, that show that NGC 3079 is going through a hectic phase in its evolution. The H I disc appears much more extended than previously observed and is morphologically and kinematically lopsided on all scales with evidence for strong non-circular motions in the central regions. Our data reveal prominent gas streams encircling the entire galaxy suggesting strong interaction with its neighbours. A 33 kpc long H I bridge is detected between NGC 3079 and MCG 9-17-9, likely caused by ram-pressure stripping of MGC 9-17-9 by the halo of hot gas of NGC 3079. The cometary H I tail of the companion NGC 3073, earlier discovered by Irwin et al., extends about twice as long in our data, while a shorter, second tail is also found. This tail is likely caused by ram-pressure stripping by the strong, starburst-driven wind coming from NGC 3079. We also detect, in absorption, a nuclear H I outflow extending to velocities well outside what expected for gravitational motion. This is likely an atomic counterpart of the well-studied outflow of ionized gas present in this galaxy. This may indicate that also large amounts of cold gas are blown out of NGC 3079 by the starburst/AGN. Our estimates of the jet energy and kinetic power suggest that both the AGN and the starburst in NGC 3079 are powerful enough to drive the atomic outflow. Key words: galaxies: starburst, galaxies: haloes, galaxies: individual (NGC 3079, NGC 3073, MCG 9-17-9), ISM: jets and outflows, galaxies: kinematics and dynamics
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