2014MNRAS.443.2650L

The United Kingdom Infrared Telescope (UKIRT) Widefield Infrared Survey for Fe+ (UWIFE) is a 180 deg2 imaging survey of the first Galactic quadrant (7° < l < 62°; {verbar}b{verbar} ≲ 1 _.^○5) that uses a narrow-band filter centred on the [Feii] 1.644-µm emission line. The [Feii] 1.644-µm emission is a good tracer of dense, shock-excited gas, and the survey will probe violent environments around stars: star-forming regions, evolved stars, and supernova remnants, among others. The UWIFE survey is designed to complement the existing UKIRT Widefield Infrared Survey for H2 (UWISH2). The survey will also complement existing broad-band surveys. The observed images have a nominal 5σ detection limit of 18.7 mag for point sources, with a median seeing of 0.83 arcsec. For extended sources, we estimate a surface brightness limit of 8.1x10^–20 W/m2/arcsec2. In this paper, we present an overview and some preliminary results of this survey.