AAS 201st Meeting, January, 2003
Session 26. Galaxy Structure and Interactions
Oral, Monday, January 6, 2003, 10:00-11:30am, 616-617

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[26.04] ACS and Keck Observations of the Dwarf Galaxy that is Interacting with UGC 10214 (``The Tadpole")

H.C. Ford, H.D. Tran, M. Sirianni (JHU), G.D. Illingworth, D. Magee (UCO/Lick Obs.), J. Barnes (UH), M. Clampin, G. Hartig (STScI), D.R. Ardila (JHU), F. Bartko (Bartko Sci. & Tech.), N. Ben\'itez, J.P. Blakeslee (JHU), R. Bouwens (UCO/Lick Observatory), T.J. Broadhurst (Racah Inst. Physics, Hebrew U.)), R.A. Brown, C. Burrows (STScI), E. Cheng (GSFC), N. Cross, P.D. Feldman (JHU), M. Franx (Leiden Obs.), D.A. Golimowski (JHU), C. Gronwall (Pennsylvania State Univ.), L. Infante (Pontificia Univ. Catolica de Chile), R.A. Kimble (GSFC), J. Krist (STScI), M. Lesser (Steward Obs.), A.R. Martel, F. Menanteau, G.R. Meurer (JHU), G. Miley (Leiden Obs.), M. Postman (STScI), P. Rosati (ESO), W.B. Sparks (STScI), Z.I. Tsvetanov (JHU), R.L. White (STScI), W. Zheng (JHU)

We present Keck Spectroscopy and deep Hubble Space Telescope ACS images of the interacting galaxy UGC 10214 (also known as VV 29 and Arp 188). UGC 10214 is a luminous spiral with a long prominent tidal tail, a faint counter tidal plume, and a polar tidal stream. Briggs et al.\ (2001, A&A, 380, 418) identified a small blue gas-rich dwarf galaxy that projects onto UGC 10214 as the galaxy that is colliding with UGC 10214. The HI gas at the position of the putative blue dwarf has a radial velocity that is 430 km/s higher than the systemic velocity of UGC 10214. The Keck spectra show ionized gas at the position of the dwarf with the same velocity as Briggs et al.'s HI cloud, strengthening their identification of the dwarf as the intruding galaxy. The observed Balmer decrement at the position of the dwarf and the colors of the dwarf suggest that the dwarf is in front of UGC 10214. The tidal tail has a projected length of ~ 120 Kpc and an age of at least 100 million years. Consequently, if the dwarf is in front of UGC 10214, it has survived one or more close encounters with UGC 10214 and is now accelerating toward the large spiral for yet another encounter. ACS was developed under NASA contract NAS 5-32865, and this research is supported by NASA grant NAG5-7697. We are grateful for an equipment grant from Sun Microsystems, Inc.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.