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Paper: HST Imaging of Bipolar Nuclear Shells in the Disturbed Virgo Cluster Galaxy NGC 4438
Volume: 249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection
Page: 133
Authors: Kenney, Jeffrey D. P.
Abstract: We discuss broad-band and narrow-band Hubble Space Telescope images of the central region of the heavily disturbed Virgo cluster galaxy NGC 4438, whose nucleus has been described as a type 1 LINER or dwarf Seyfert. Narrow-band H α and [N ii] HST images reveal strikingly asymmetric bipolar shell features, 1 kpc in projected length from end to end, which are likely the result of an outflow from the nuclear region experiencing a strong interaction with the ISM. While these outflow shells share similarities with those in some other starburst or AGN galaxies, these in NGC 4438 are notable because NGC 4438 harbors neither a luminous starburst nor a luminous AGN. We discuss the origin of the outflow, and the influence of the galaxy interaction on the outflow.
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