Journal
ASTRONOMICAL JOURNAL
Volume 141, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/141/6/204
Keywords
galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: kinematics and dynamics; large-scale structure of Universe; radio lines: galaxies
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Funding
- National Science Foundation [1009476]
- U.S. Government [NAG W-2166]
- National Science Foundation
- National Geographic Society
- Sloan Foundation
- Samuel Oschin Foundation
- Eastman Kodak Corporation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009476] Funding Source: National Science Foundation
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We have found that KK 246, the only confirmed galaxy located within the nearby Tully Void, is a dwarf galaxy with an extremely extended H I disk and signs of an H I cloud with anomalous velocity. It also exhibits clear misalignment between the kinematical major and minor axes, indicative of an oval distortion, and a general misalignment between the H I and optical major axes. We measure an H I mass of (1.05 +/- 0.08) x 10(8) M-circle dot, and an Hi extent five times that of the stellar disk, one of the most extended H I disks known. We estimate a dynamical mass of 4.1 x 10(9) M-circle dot, making this also one of the darkest galaxies known, with a mass-to-light ratio of 89. The relative isolation and extreme underdense environment make this an interesting case for examining the role of gas accretion in galaxy evolution.
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