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Stellar Populations of Late-Type Bulges at z=1 in the HUDF | | N. P. Hathi
; I. Ferreras
; A. Pasquali
; S. Malhotra
; J. E. Rhoads
; N. Pirzkal
; R. A. Windhorst
; C. Xu
; | | Date: |
6 May 2008 | | Abstract: | We take advantage of the exceptional depth of the Hubble Ultra Deep
Field (HUDF) images and the deep GRism ACS Program for Extragalactic
Science (GRAPES) grism spectroscopy to explore the stellar populations of 34
bulges belonging to late-type galaxies at z=0.8-1.3. We selected these galaxies
based on the presence of a noticeable Balmer break (at 4000 A) in their GRAPES
spectra, and by visual inspection of the HUDF images. The narrow extraction of
these GRAPES spectra around the galaxy center enable us to study the spectrum
of the bulges in these late-type galaxies. The 4000 A break in the bulges
spectra allows us to estimate the bulges redshifts and stellar ages. We first
used the HUDF images to measure bulges color and Sersic index, and then we
analyze the bulges spectra by fitting stellar population models. Our results
show that, (1) the average age of late-type bulges in our sample is ~1.3 Gyr
and stellar masses are in the range of log(M)=6.5-10 solar, (2) late-type
bulges are younger and less massive compared to bulges in early-type galaxies
at similar redshifts, (3) bulges and inner disks in these late-type galaxies
show similar dominant stellar populations, suggestive of an inside-out
formation scenario, and (4) late-type bulges are better fitted by exponential
surface brightness profiles. The overall picture emerging from the GRAPES data
is that, in late-type galaxies at z=1, bulges form through secular evolution
and disks via an inside-out process. | | Source: | arXiv, 0805.0791 | | Services: | Forum | Review | PDF | Favorites | |
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