KK246, a dwarf galaxy with extended H I disk in the Local Void

J. H. van Gorkom; J. M. van der Hulst; K. Kreckel; P. J. E. Peebles; R. van de Weygaert

arxiv: 1103.5798 · v1 · pith:B6AX5CD6new · submitted 2011-03-30 · 🌌 astro-ph.CO

KK246, a dwarf galaxy with extended H I disk in the Local Void

K. Kreckel , P. J. E. Peebles , J. H. van Gorkom , R. van de Weygaert , J. M. van der Hulst This is my paper

classification 🌌 astro-ph.CO

keywords galaxydiskextendedaxesdwarfknownmajormass

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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 a H I mass of 1.05 +- 0.08 x 10^8 M_sun, and a H I extent 5 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_sun, 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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