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Title:
The M81 Group Dwarf Irregular Galaxy DDO 165. High Velocity HI Gas in a Post-Starburst System
Authors:
Most, Hans; Cannon, J. M.; Skillman, E. D.; Weisz, D. R.; Dolphin, A. E.; Kennicutt, R. C.; Lee, J.; Walter, F.
Affiliation:
AA(Macalester College), AB(Macalester College), AC(University of Minnesota), AD(University of Minnesota), AE(Raytheon Corporation), AF(Institute of Astronomy, United Kingdom), AG(Observatories of the Carnegie Institute of Wasington), AH(MPIA, Germany)
Publication:
American Astronomical Society, AAS Meeting #213, #419.02; Bulletin of the American Astronomical Society, Vol. 41, p.233
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21341902M

Abstract

We present new multi-configuration Very Large Array HI spectral line observations of the dwarf irregular post-starburst galaxy DDO 165. The HI morphology is complex, with multiple column density peaks surrounding a large hole that is offset from the center of the stellar distribution. The bulk of the neutral gas is associated with the southern section of the galaxy; a secondary peak in the north contains 15% of the total HI mass. Remarkably, these components appear to be kinematically distinct, suggesting that either tidal processes or large-scale blowout have recently shaped the ISM of DDO 165. Using spatially-resolved position-velocity maps, we find multiple localized high-velocity gas features. Cross-correlating with radius-velocity analyses, we find numerous shell/hole structures in the ISM with a range of sizes ( 400 pc - 900 pc) and expansion velocities ( 7-11 km s-1). These structures are compared with narrow- and broad-band imaging from KPNO and HST. From the latter investigation, Weisz et al. (2009) show that DDO 165's previous "burst" phase was extended temporally ( 400 Myr). We thus interpret the high-velocity gas features, HI holes, and kinematically distinct components of the galaxy in the context of the immediate effects of "feedback" from recent star formation shaping the ISM.
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