We present optical , near- and mid-infrared imaging of the host galaxy of FRB 121102 with the Gemini North telescope , the Hubble Space Telescope and the Spitzer Space Telescope .
The FRB 121102 host galaxy is resolved , revealing a bright star forming region located in the outskirts of the irregular , low-metallicity dwarf galaxy .
The star forming region has a half-light radius of 0.68 kpc ( 0 \farcs 20 ) , encompassing the projected location of the compact ( < 0.7 pc ) , persistent radio source that is associated with FRB 121102 .
The half-light diameter of the dwarf galaxy is 5 to 7 kpc , and broadband spectral energy distribution fitting indicates that it has a total stellar mass of M _ { \star } \sim 10 ^ { 8 } M _ { \odot } .
The metallicity of the host galaxy is low , 12 + \log _ { 10 } ( \mathrm { [ O / H ] } ) = 8.0 \pm 0.1 .
The properties of the host galaxy of FRB 121102 are comparable to those of extreme emission line galaxies , also known to host hydrogen-poor superluminous supernovae and long-duration \gamma -ray bursts .
The projected location of FRB 121102 within the star forming region supports the proposed connection of FRBs with newly born neutron stars or magnetars .