Integral Field Spectroscopy of a Candidate Disk Galaxy at z ∼ 1.5 Using Laser Guide Star Adaptive Optics

Abstract

We present 0.1" resolution near-infrared integral field spectroscopy of Hα in a z=1.4781 star-forming galaxy, Q2343-BM133. These observations were obtained with the OH Suppressing Infra-Red Imaging Spectrograph (OSIRIS) using the W. M. Keck Observatory laser guide star adaptive optics (LGS AO) system. Hα emission is resolved over a 0.8''(6.8 kpc)×0.5''(4.3 kpc) region with a 0.1" spatial resolution. We find a global flux of 4.2+/-0.6×10-16 ergs s-1 cm-2, and detect a spatially resolved velocity gradient of ~134 km s-1 across the galaxy and a global velocity dispersion of 73+/-9 km s-1. An upper limit of [N II]/Hα