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New Constraints on Cosmic Reionization from the 2012 Hubble Ultra Deep Field Campaign | | Brant E. Robertson
; Steven R. Furlanetto
; Evan Schneider
; Stephane Charlot
; Richard S. Ellis
; Daniel P. Stark
; Ross J. McLure
; James S. Dunlop
; Anton Koekemoer
; Matthew A. Schenker
; Masami Ouchi
; Yoshiaki Ono
; Emma Curtis-Lake
; Alexander B. Rogers
; Rebecca A. A. Bowler
; Michele Cirasuolo
; | | Date: |
7 Jan 2013 | | Abstract: | Understanding cosmic reionization requires the identification and
characterization of early sources of hydrogen-ionizing photons. The 2012 Hubble
Ultra Deep Field (UDF12) campaign has acquired the deepest infrared images with
the Wide Field Camera 3 aboard Hubble Space Telescope and, for the first time,
systematically explored the galaxy population deep into the era when cosmic
microwave background (CMB) data indicates reionization was underway. The UDF12
campaign thus provides the best constraints to date on the abundance,
luminosity distribution, and spectral properties of early star-forming
galaxies. We synthesize the new UDF12 results with the most recent constraints
from CMB observations to infer redshift-dependent ultraviolet (UV) luminosity
densities, reionization histories, and electron scattering optical depth
evolution consistent with the available data. Under reasonable assumptions
about the escape fraction of hydrogen ionizing photons and the intergalactic
medium clumping factor, we find that to fully reionize the universe by redshift
z~6 the population of star-forming galaxies at redshifts z~7-9 likely must
extend in luminosity below the UDF12 limits to absolute UV magnitudes of
M_UVsim -13 or fainter. Moreover, low levels of star formation extending to
redshifts z~15-25, as suggested by the normal UV colors of zsimeq7-8 galaxies
and the smooth decline in abundance with redshift observed by UDF12 to
zsimeq10, are additionally likely required to reproduce the optical depth to
electron scattering inferred from CMB observations. | | Source: | arXiv, 1301.1228 | | Services: | Forum | Review | PDF | Favorites | |
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