2019ApJ...883...17C

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 [Oiii]λ5007 emission with a flux F^[Oiii]λ5007^=(2.4±0.5)×10^–17 erg s^–1 cm^–2, as well as unresolved [Oiii]λ4959 and Hβλ4861 emission. Using a composite spectrum over the emission region, we measure dynamical mass ∼3.1×10⁹M_☉. We made several estimates of star formation rate (SFR) using [Oiii]λ5007 and Hβλ4861 emission, and measured a SFR of ∼7.1 - 13.6 M_☉ yr^–1. We map [Oiii]λ5007 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.