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A Panchromatic Catalog of Early-Type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field | | M. J. Rutkowski
; S. H. Cohen
; S. Kaviraj
; R. W. O'Connell
; N. P. Hathi
; R. A. Windhorst
; R. E. Ryan Jr.
; R. M. Crockett
; H. Yan
; R. A. Kimble
; J. Silk
; P.J. McCarthy
; A. Koekemoer
; B. Balick
; H. E. Bond
; D. Calzetti
; M. J. Disney
; M. A. Dopita
; J. A. Frogel
; D. N. B. Hall
; J. A. Holtzman
; F. Paresce
; A. Saha
; J. T. Trauger
; A. R. Walker
; B. C. Whitmore
; E. T. Young
; | | Date: |
31 Jan 2012 | | Abstract: | In the first of a series of forthcoming publications, we present a
panchromatic catalog of 102 visually-selected early-type galaxies (ETGs) from
observations in the Early Release Science (ERS) program with the Wide Field
Camera 3 (WFC3) on the Hubble Space Telescope (HST) of the Great Observatories
Origins Deep Survey-South (GOODS-S) field. Our ETGs span a large redshift
range, 0.35 < z < 1.5, with each redshift spectroscopically-confirmed by
previous published surveys of the ERS field. We combine our measured WFC3 ERS
and ACS GOODS-S photometry to gain continuous sensitivity from the rest-frame
far-UV to near-IR emission for each ETG. The superior spatial resolution of the
HST over this panchromatic baseline allows us to classify the ETGs by their
small-scale internal structures, as well as their local environment. By fitting
stellar population spectral templates to the broad-band photometry of the ETGs,
we determine that the average masses of the ETGs are comparable to the
characteristic stellar mass of massive galaxies, 11< log(M [Solar]) < 12.
By transforming the observed photometry into the GALEX FUV and NUV, Johnson
V, and SDSS g’ and r’ bandpasses we identify a noteworthy diversity in the
rest-frame UV-optical colors and find the mean rest-frame (FUV-V)=3.5 and
(NUV-V)=3.3, with 1$sigma$ standard deviations approximately equal to 1.0. The
blue rest-frame UV-optical colors observed for most of the ETGs are evidence
for star-formation during the preceding gigayear, but no systems exhibit
UV-optical photometry consistent with major recent (<~50 Myr) starbursts.
Future publications which address the diversity of stellar populations likely
to be present in these ETGs, and the potential mechanisms by which recent
star-formation episodes are activated, are discussed. | | Source: | arXiv, 1201.6416 | | Services: | Forum | Review | PDF | Favorites | |
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