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Title:
Morphology and Evolution of Emission-Line Galaxies in the Hubble Ultra Deep Field
Authors:
Pirzkal, N.; Xu, C.; Ferreras, I.; Malhotra, S.; Mobasher, B.; Rhoads, J. E.; Pasquali, A.; Panagia, N.; Koekemoer, A. M.; Ferguson, H. C.; Gronwall, C.
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AB(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AC(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), 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(Institute of Astronomy, ETH Hönggerberg, 8093 Zurich, Switzerland.), AH(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AI(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AJ(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AK(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.)
Publication:
The Astrophysical Journal, Volume 636, Issue 2, pp. 582-591. (ApJ Homepage)
Publication Date:
01/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift, Galaxies: Structure, Surveys
DOI:
10.1086/498129
Bibliographic Code:
2006ApJ...636..582P

Abstract

We investigate the properties and evolution of a sample of galaxies selected to have prominent emission lines in low-resolution grism spectra of the Hubble Ultra Deep Field (HUDF). These objects, eGRAPES, are late-type blue galaxies characterized by small proper sizes (R50<=2 kpc) in the 4350 Å rest frame, low masses (5×109 Msolar), and a wide range of luminosities and surface brightnesses. The masses, sizes, and volume densities of these objects appear to change very little up to a redshift of z=1.5. On the other hand, their surface brightness decreases significantly from z=1.5 to 0, while their mass-to-light ratio increases twofold. This could be a sign that most low-redshift eGRAPES have a stellar population older than high-redshift eGRAPES and hence that most eGRAPES formed at higher redshifts. The average volume density of eGRAPES is (1.8+/-0.3)×10-3 h370 Mpc-3 at 0.3<z<=1.5. Many eGRAPES would have been formally classified as luminous compact blue galaxies (LCBGs) if these had been selected based on small physical size, blue intrinsic color, and high surface brightness, while the remainder of the sample discussed in this paper forms an extension of LCBGs toward fainter luminosities.
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