Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341902m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #419.02; Bulletin of the American Astronomical Society, Vol. 41, p.233
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Cannon John M.
Dolphin Andrew E.
Kennicutt Robert C.
Lee Julian
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