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The WiggleZ Dark Energy Survey: High Resolution Kinematics of Luminous Star-Forming Galaxies | | Emily Wisnioski
; Karl Glazebrook
; Chris Blake
; Ted Wyder
; Chris Martin
; Gregory B. Poole
; Rob Sharp
; Warrick Couch
; Glenn G. Kacprzak
; Sarah Brough
; Matthew Colless
; Carlos Contreras
; Scott Croom
; Darren Croton
; Tamara Davis
; Michael J. Drinkwater
; Karl Forster
; David G. Gilbank
; Michael Gladders
; Ben Jelliffe
; Russell J. Jurek
; I-hui Li
; Barry Madore
; Kevin Pimbblet
; Michael Pracy
; David Woods
; H.K.C. Yee
; | | Date: |
18 Jul 2011 | | Abstract: | We report evidence of ordered orbital motion in luminous star-forming
galaxies at z~1.3. We present integral field spectroscopy (IFS) observations,
performed with the OH Suppressing InfraRed Imaging Spectrograph (OSIRIS)
system, assisted by laser guide star adaptive optics on the Keck telescope, of
13 star-forming galaxies selected from the WiggleZ Dark Energy Survey. Selected
via ultraviolet and [OII] emission, the large volume of the WiggleZ survey
allows the selection of sources which have comparable intrinsic luminosity and
stellar mass to IFS samples at z>2. Multiple 1-2 kpc size sub-components of
emission, or ’clumps’, are detected within the Halpha spatial emission which
extends over 6-10 kpc in 4 galaxies, resolved compact emission (r<3 kpc) is
detected in 5 galaxies, and extended regions of Halpha emission are observed in
the remaining 4 galaxies. We discuss these data in the context of different
snapshots in a merger sequence and/or the evolutionary stages of coalescence of
star-forming regions in an unstable disk. We find evidence of ordered orbital
motion in galaxies as expected from disk models and the highest values of
velocity dispersion (sigma>100 km/s) in the most compact sources. This unique
data set reveals that the most luminous star-forming galaxies at z>1 are
gaseous unstable disks indicating that a different mode of star formation could
be feeding gas to galaxies at z>1, and lending support to theories of cold
dense gas flows from the intergalactic medium. | | Source: | arXiv, 1107.3338 | | Services: | Forum | Review | PDF | Favorites | |
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