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arXiv · 1909.08523

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

Holly M. Christenson·Regina A. Jorgenson
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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$0.15 arcseconds and marginally resolve extended, foreground DLA emission. We detect [OIII]$λ$5007 emission with a flux F$^{[OIII]\lambda5007}$ = $(2.4\pm0.5)\times10^{-17}$ erg s$^{-1}$ cm$^{-2}$, as well as unresolved [OIII]$λ$4959 and H$βλ$4861 emission. Using a composite spectrum over the emission region, we measure dynamical mass $\sim$ $3.1\times10^9$ M$_{\odot}$. We make several estimates of star formation rate using [OIII]$λ$5007 and H$βλ$4861 emission, and measure a star formation rate of $\sim$ $7.1- 13.6$ M$_{\odot}$ yr$^{-1}$. We map [OIII]$λ$5007 and H$βλ$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.

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Holly M. Christenson, Regina A. Jorgenson. 2019-09-18. Keck/OSIRIS IFU Detection of a z $\sim$ 3 Damped Lyman Alpha Host Galaxy. https://doi.org/10.3847/1538-4357%2Fab3464

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