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Date and Time of the Query: 2019-08-17 T08:37:47 PDT
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For refcode 2006ApJ...640L.143N:
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2006ApJ...640L.143N Luminous Compact Blue Galaxies up to z~1 in the Hubble Space Telescope Ultra Deep Field. I. Small Galaxies or Blue Centers of Massive Disks? Noeske, K. G.; Koo, D. C.; Phillips, A. C.; Willmer, C. N. A.; Melbourne, J.; Gil de Paz, A.; Papaderos, P. Abstract. We analyze 26 luminous compact blue galaxies (LCBGs) in the Hubble Space Telescope ACS Ultra Deep Field (UDF) at z~0.2-1.3, to determine whether these truly are small galaxies or, rather, bright central starbursts within existing or forming large disk galaxies. Surface brightness profiles from UDF images reach fainter than rest-frame 26.5 B mag arcsec^-2^ even for compact objects at z~1. Most LCBGs show a smaller, brighter component that is likely star-forming, and an extended, roughly exponential component with colors suggesting stellar ages from >~100 Myr to a few gigayears. Scale lengths of the extended components are mostly <~2 kpc, more than 1.5-2 times smaller than those of nearby large disk galaxies like the Milky Way. Larger, very low surface brightness disks can be excluded down to faint rest-frame surface brightnesses (>~26 B mag arcsec^-2^). However, one or two of the LCBGs are large, disklike galaxies that meet LCBG selection criteria because of a bright central nucleus, possibly a forming bulge. These results indicate that >~90% of high-z LCBGs are small galaxies that will evolve into small disk galaxies, or low-mass spheroidal or irregular galaxies in the local universe, assuming passive evolution and no significant disk growth. The data do not reveal signs of disk formation around small, H II galaxy-like LCBGs, nor do they suggest a simple inside-out growth scenario for larger LCBGs with a disklike morphology. Irregular blue emission in distant LCBGs is relatively extended, suggesting that nebular emission lines from star-forming regions sample a major fraction of an LCBG's velocity field. Key words: Galaxies: Compact, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Kinematics and Dynamics, Galaxies: Starburst, Galaxies: Structure
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