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 similar to 0." 15 and marginally resolve extended, foreground DLA emission. We detect [O III] lambda 5007 emission with a flux F-[O III]lambda 5007 = (2.4 +/- 0.5) x 10(-17) erg s(-1) cm(-2), as well as unresolved [O III] lambda 4959 and H beta lambda 4861emission. Using a composite spectrum over the emission region, we measure dynamical mass similar to 3.1 x 10(9) M-circle dot. We made several estimates of star formation rate (SFR) using [O III] lambda 5007 and H beta lambda 4861 emission, and measured a SFR of similar to 7.1 - 13.6 M(circle dot)yr(-1). We map [O III]lambda 5007 and H beta lambda 4861 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.