AAS 201st Meeting, January, 2003
Session 109. Fine Structure in Galaxies
Oral, Wednesday, January 8, 2003, 2:00-3:30pm, 613-614

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[109.01] Internal Color Properties of early-type galaxies on HST/ACS ERO UCG10214

F. Menanteau, H.C. Ford (JHU), M. Clampin (STScI), G.D. Illingworth (UCO/Lick Obs.), 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 (PUC), R.A. Kimble (GSFC), J.E. Krist (STScI), M. Lesser (Steward Obs.), A.R. Martel, G.R. Meurer (JHU), G. Miley (Leiden Obs.), M. Postman (STScI), P. Rosati (ESO), M. Sirianni (JHU), W.B. Sparks (STScI), H.D. Tran, Z.I. Tsvetanov (JHU), R.L. White (STScI), W. Zheng (JHU), ACS Science Team

In this paper/poster we study the internal color properties of a morphologically selected sample of spheroidal galaxies taken from the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) ERO program of UGC 10214. We take advantage of the unprecedented ability of ACS deep images to resolve galaxies at faint limits in order to analyze the internal color properties of spheroids at pixel-scales. We use the B475W, V606W and I814W --band multicolor information to construct V-I and B-V color maps and extract color gradients for spheroids at I814W < 24 mag. We asses the ability of ACS to study galaxies at pixel-scale by comparing it with the results from similar analysis on the the best multicolor data available for this purpose from the Hubble Deep Fields (HDFs) North and South. We find that ACS data requires ~10 times less exposure time to obtain 1/2 the amount of data obtained previously with HST. We find a similar fraction of early-type systems (~0%) with inverse color gradients and blue centers as well as perturbed color maps comparable to those reported in the HDFs. We discuss the implication of this in the context of spheroidal formation.

ACS was developed under NASA contract NAS 5-32864, and this research is supported by NASA grant NAG5-7697.

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