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Title:
Bulge Stellar Population In Late-type Spiral Galaxies At z=1 In The HUDF
Authors:
Hathi, Nimish P.; Ferreras, I.; Pasquali, A.; Malhotra, S.; Rhoads, J.; Pirzkal, N.
Affiliation:
AA(Arizona State Univ), AB(King's College London, United Kingdom), AC(Max-Planck-Institut fur Astronomie, Germany), AD(Arizona State Univ), AE(Arizona State Univ), AF(Space Telescope Science Institute)
Publication:
American Astronomical Society Meeting 210, #08.06; Bulletin of the American Astronomical Society, Vol. 38, p.104
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...210.0806H

Abstract

Galaxy bulge formation scenarios predict three possibilities: bulge forms after disk, bulge and disk form simultaneously and bulge forms before disk. The ability of the Hubble Space Telescope (HST) to resolve distant galaxies has made it possible to study bulge properties of field ellipticals and spirals out to redshift z=1. Using high resolution imaging of the Hubble Ultra Deep Field (HUDF) and deep ACS grism spectroscopy of the GRism ACS Program for Extragalactic Science (GRAPES) project, we identify 39 z=1 late-type spiral galaxies with visible red bulges and observable 4000A break in the grism spectra. We apply bulge-to-disk decomposition using the GALFIT algorithm and a consistent chemical enrichment code combined with population synthesis models to estimate mass and ages of the bulge stellar populations. We find a mixture of stellar populations. Some are dominated by old, passively evolving stars, formed at redshifts z>2, but most correspond to younger ages, around 1 Gyr. Our bulges span a much wider range of ages compared to early-type galaxies. The mass estimates for these bulges are in the range of 1e7 to 1e11 solar. This research was supported by HST grant GO 9793 and GO 10530.
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