KK 246: A DWARF GALAXY WITH AN EXTENDED H I DISK IN THE LOCAL VOID

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/141/6/204· OSTI ID:21583093

Kreckel, K; Van Gorkom, J H ^[1]; Peebles, P J. E. ^[2]; Van de Weygaert, R

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1. Department of Astronomy, Columbia University, Mail Code 5246, 550 West 120th Street, New York, NY 10027 (United States)
2. Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544 (United States)

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{sup 8} M{sub sun}, and an H I 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{sup 9} M{sub 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.

• OSTI ID: 21583093
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 6; Other Information: DOI: 10.1088/0004-6256/141/6/204; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

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