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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 z∼1.4–2.4 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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