Keck/OSIRIS IFU Detection of a z ∼ 3 Damped Lyα Host Galaxy.

We present Keck/OSIRIS infrared IFU observations of the z = 3.153 sub-DLA DLA2233+131, previously detected in absorption to a background quasar and studied with single-slit spectroscopy and Potsdam Multi Aperture Spectrophotometer integral field spectroscopy (IFU). We used the Laser Guide Star Adaptive Optics and OSIRIS IFU to reduce the point-spread function of the background quasar to FWHM ∼ 0.″15 and marginally resolve extended, foreground DLA emission. We detect emission with a flux erg s−1 cm−2, as well as unresolved and Hβλ4861 emission. Using a composite spectrum over the emission region, we measure dynamical mass M⊙. We made several estimates of star formation rate (SFR) using and Hβλ4861 emission, and measured a SFR of ∼7.1 − 13.6 M⊙ yr−1. We map and Hβλ4861 emission and the corresponding velocity fields to search for signs of kinematic structure. These maps allow for a more detailed kinematic analysis than previously possible for this galaxy. While some regions show slightly red and blueshifted emission indicative of potential edge-on disk rotation, the data are insufficient to support this interpretation. [ABSTRACT FROM AUTHOR]