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Paper: A Near-IR Integral Field Spectroscopic Insight to Starburst Monsters at z∼2: The Case of Submillimeter Galaxies
Volume: 446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
Page: 263
Authors: Menéndez-Delmestre, K.; Blain, A. W.; Swinbank, M.; Smail, I.; Ivison, R. J.; Chapman, S. C.
Abstract: We target Hα emission of three submillimeter-selected galaxies (SMGs) at redshifts z1.4–2.4 with the OH-Suppressing Infrared Imaging Spectrograph (OSIRIS) on Keck. The integral field spectroscopic view of these objects allows us to disentangle the broad Hα emission arising from compact regions associated with an AGN from the spatially-extended narrow-line Hα emission corresponding to star formation. The corresponding star-formation rate surface densities in these SMGs is similar to that generally found in local circumnuclear starbursts and low-redshift luminous infrared galaxies. However, in contrast to these local environments where star formation is usually confined to the central 1–2kpc, the star formation in these SMGs is spread onto significantly larger spatial scales (up to ∼> 15 kpc). We also explore the dynamics of ionized gas as given by Hα emission to improve our understanding of the internal dynamics of these SMGs. We find no evidence to suggest a rotating disk in these galaxies, but rather large velocity offsets (∼few ×100 km s-1) between distinct galactic-scale sub-components pointing towards a merging nature.
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