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Title:
Advanced Camera for Surveys Observations of Young Star Clusters in the Interacting Galaxy UGC 10214
Authors:
Tran, H. D.; Sirianni, M.; Ford, H. C.; Illingworth, G. D.; Clampin, M.; Hartig, G.; Becker, R. H.; White, R. L.; Bartko, F.; Benítez, N.; Blakeslee, J. P.; Bouwens, R.; Broadhurst, T. J.; Brown, R.; Burrows, C.; Cheng, E.; Cross, N.; Feldman, P. D.; Franx, M.; Golimowski, D. A.; Gronwall, C.; Infante, L.; Kimble, R. A.; Krist, J.; Lesser, M.; Magee, D.; Martel, A. R.; McCann, Wm. J.; Meurer, G. R.; Miley, G.; Postman, M.; Rosati, P.; Sparks, W. B.; Tsvetanov, Z.
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AB(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AC(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AD(University of California Observatories, Lick Observatory, University of California at Santa Cruz, Natural Sciences II Annex, Santa Cruz, CA 95064; , , .), AE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AF(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AG(Physics Department, University of California at Davis, 1 Shields Avenue, Davis, CA 95616; and Institute for Geophysics and Planetary Physics, L-413, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550; .), AH(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AI(Bartko Science and Technology, P.O. Box 670, Mead, CO 80542-0670 .), AJ(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AK(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AL(University of California Observatories, Lick Observatory, University of California at Santa Cruz, Natural Sciences II Annex, Santa Cruz, CA 95064; , , .), AM(Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel; .), AN(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AO(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AP(NASA Goddard Space Flight Center, Greenbelt, MD 20771; , .), AQ(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AR(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AS(Leiden Observatory, P.O. Box 9513, 2300 Leiden, The Netherlands; , .), AT(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), AU(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; .), AV(Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 22, Chile; .), AW(NASA Goddard Space Flight Center, Greenbelt, MD 20771; , .), AX(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), AY(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Room N204, Tucson, AZ 85721; .), AZ(University of California Observatories, Lick Observatory, University of California at Santa Cruz, Natural Sciences II Annex, Santa Cruz, CA 95064; , , .), BA(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), BB(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), BC(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .), BD(Leiden Observatory, P.O. Box 9513, 2300 Leiden, The Netherlands; , .), BE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), BF(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany; .), BG(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , ; , , , , .), BH(Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21218; , , , , , , , , , , , .)
Publication:
The Astrophysical Journal, Volume 585, Issue 2, pp. 750-755. (ApJ Homepage)
Publication Date:
03/2003
Origin:
UCP
ApJ Keywords:
Galaxies: Individual: Name: Arp 188, Galaxies: Individual: Alphanumeric: UGC 10214, Galaxies: Individual: Alphanumeric: VV 29, Galaxies: Star Clusters
DOI:
10.1086/346125
Bibliographic Code:
2003ApJ...585..750T

Abstract

We present the first Advanced Camera for Surveys (ACS) observations of young star clusters in the colliding/merging galaxy UGC 10214. The observations were made as part of the Early Release Observation (ERO) program for the newly installed ACS during service mission SM3B for the Hubble Space Telescope (HST). Many young star clusters can be identified in the tails of UGC 10214, with ages ranging from ~3 to 10 Myr. The extreme blue V-I (F606W-F814W) colors of the star clusters found in the tail of UGC 10214 can only be explained if strong emission lines are included with a young stellar population. This has been confirmed by our Keck spectroscopy of some of these bright blue stellar knots. The most luminous and largest of these blue knots has an absolute magnitude of MV=-14.45, with a half-light radius of 161 pc, and if it is a single star cluster, it would qualify as a super star cluster (SSC). Alternatively, it could be a superposition of multiple scaled OB associations or clusters. With an estimated age of ~4-5 Myr, its derived mass is less than 1.3×106Msolar. Thus, the young stellar knot is unbound and will not evolve into a normal globular cluster. The bright blue clusters and associations are much younger than the dynamical age of the tail, providing strong evidence that star formation occurs in the tail long after it was ejected. UGC 10214 provides a nearby example of processes that contributed to the formation of halos and intracluster media in the distant and younger universe.
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