Spatially Resolved Emission of a High Redshift DLA Galaxy with the Keck/OSIRIS IFU

Abstract

We present the first Keck/OSIRIS infrared IFU observations of a high redshift damped Lyman-alpha (DLA) galaxy detected in the line of sight to a background quasar. By utilizing the Laser Guide Star Adaptive Optics (LGSAO) to reduce the quasar PSF to FWHM~0.15 arcsec, we were able to search for and map the foreground DLA emission free from the quasar contamination. We present maps of the H-alpha and [OIII] $\lambda \lambda$ 5007, 4959 emission of DLA 2222-0946 at a redshift of z ~ 2.35. From the composite spectrum over the H-alpha emission region we measure a star formation rate of 9.5 $\pm$ 1.0 M${}_{\odot }$ year${}^{-1}$ and a dynamical mass, M${}_{dyn}$ = 6.1 x 10${}^9$ M${}_{\odot }$. The average star formation rate surface density is < Σ_{SFR} > = 0.55 M${}_{\odot }$ yr${}^{-1}$ kpc${}^{-2}$, with a central peak of 1.7 M${}_{\odot }$ yr${}^{-1}$ kpc${}^{-2}$. Using the standard Kennicutt-Schmidt relation, this corresponds to a gas mass surface density of ${\Sigma }_{gas}$ = 243 M${}_{\odot }$ pc${}^{-2}$. Integrating over the size of the galaxy we find a total gas mass of M${}_{gas}$ = 4.2 x 10${}^9$ M${}_{\odot }$. We estimate the gas fraction of DLA 2222-0946 to be $f_{gas}$ ~ 40%. We detect [NII]$\lambda$6583 emission at 2.5 sigma significance with a flux corresponding to a metallicity of 75% solar. Comparing this metallicity with that derived from the low-ion absorption gas ~6 kpc away, ~30% solar, indicates possible evidence for a metallicity gradient or enriched in/outflow of gas. Kinematically, both H-alpha and [OIII] emission show relatively constant velocity fields over the central galactic region. While we detect some red and blueshifted clumps of emission, they do not correspond with rotational signatures that support an edge-on disk interpretation.

Submitted to ApJ

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