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arxiv: 1103.5265 · v1 · pith:BFCQSFUBnew · submitted 2011-03-28 · 🌌 astro-ph.CO

Clumpology of Starbursts in the WiggleZ Dark Energy Survey

classification 🌌 astro-ph.CO
keywords emissiongalaxiesdarkenergyhalpharangesurveyunstable
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We have observed Halpha emission from a sample of 13 star-forming galaxies from the WiggleZ Dark Energy Survey in the redshift range z~1.2-1.5 and stellar mass range 9.8<log(M_*/M_sun)<11.6 with the integral field spectrograph OSIRIS on Keck, taking advantage of Laser Guide Star Adaptive Optics. We detect multiple emission, 1-2 kpc size sub-components, or 'clumps' within the Halpha spatial emission in 4 galaxies, extended emission in 4 galaxies and compact spheroidal emission in 5 galaxies. Considering our results in the context of unstable disk formation and a merger sequence, we find evidence of ordered orbital motion in the majority of galaxies as would be found in unstable gaseous disks.

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