Keck/OSIRIS IFU Detection of a z $\sim$ 3 Damped Lyman Alpha Host Galaxy

Abstract

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 PMAS integral field spectroscopy (IFU). We used the Laser Guide Star Adaptive Optics (LGSAO) and OSIRIS IFU to reduce the point-spread function of the background quasar to FWHM$\sim$0.15 arcseconds and marginally resolve extended, foreground DLA emission. We detect [OIII]$\lambda$5007 emission with a flux F${}^{[OIII]\lambda 5007}$ = $(2.4\pm 0.5)\times 10^{-17}$ erg s${}^{-1}$ cm${}^{-2}$, as well as unresolved [OIII]$\lambda$4959 and H$\beta \lambda$4861 emission. Using a composite spectrum over the emission region, we measure dynamical mass $\sim$ $3.1\times 10^9$ M${}_{\odot }$. We make several estimates of star formation rate using [OIII]$\lambda$5007 and H$\beta \lambda$4861 emission, and measure a star formation rate of $\sim$ $7.1-13.6$ M${}_{\odot }$ yr${}^{-1}$. We map [OIII]$\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 blue-shifted emission indicative of potential edge-on disk rotation, the data are insufficient to support this interpretation.

arXiv comment10 pages, 7 figures

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