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18 April 2024 |
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HST WFC3 Early Release Science: Emission-Line Galaxies from IR Grism Observations | | A. N. Straughn
; H. Kuntschner
; M. Kuemmel
; J. R. Walsh
; S. H. Cohen
; J.P. Gardner
; R. A. Windhorst
; R. W. O'Connell
; N. Pirzkal
; G. Meurer
; P.J. McCarthy
; N. P. Hathi
; S. Malhotra
; J. Rhoads
; B. Balick
; H. E. Bond
; D. Calzetti
; M. J. Disney
; M. A. Dopita
; J. A. Frogel
; D. N. B. Hall
; J. A. Holtzman
; R. A. Kimble
; G. Luppino
; F. Paresce
; A. Saha
; J. I. Silk
; J. T. Trauger
; A. R. Walker
; B. C. Whitmore
; E. T. Young
; | | Date: |
18 May 2010 | | Abstract: | We present grism spectra of emission--line galaxies (ELGs) from 0.6--1.6
microns from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope
(HST). These new infrared grism data augment previous optical Advanced Camera
for Surveys G800L (0.6--0.95 micron) grism data in GOODS--South, extending the
wavelength covereage well past the G800L red cutoff. The ERS grism field was
observed at a depth of 2 orbits per grism, yielding spectra of hundreds of
faint objects, a subset of which are presented here. ELGs are studied via the
Ha, OIII, and OII emission lines detected in the redshift ranges
0.2$cle$z$cle$1.6, 1.2$cle$z$cle$2.4 and 2.0$cle$z$cle$3.6 respectively
in the G102 (0.8--1.1 microns; R$sim$210) and G141 (1.1--1.6 microns;
R$sim$130) grisms. The higher spectral resolution afforded by the WFC3 grisms
also reveals emission lines not detectable with the G800L grism (e.g., SII
and SIII lines). From these relatively shallow observations, line
luminosities, star--formation rates, and grism spectroscopic redshifts are
determined for a total of 25 ELGs to m$_{AB(F098M)}$$sim$25 mag. The faintest
source in our sample---with a strong but unidentified emission--line---is
m$_{AB(F098M)}$$=$26.9 mag. We also detect the expected trend of lower specific
star formation rates for the highest mass galaxies in the sample, indicative of
downsizing and discovered previously from large surveys. These results
demonstrate the remarkable efficiency and capability of the WFC3 NIR grisms for
measuring galaxy properties to faint magnitudes. | | Source: | arXiv, 1005.3071 | | Services: | Forum | Review | PDF | Favorites | |
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