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Multi-line imaging of the nearby disk galaxy NGC 1482 with the Taurus TunableFilter (TTF) on the Anglo-Australian Telescope reveals a remarkablehourglass-shaped [N II] 6583/H-alpha excitation structure suggestive of agalactic wind extending at least 1.5 kpc above and below the disk of the hostgalaxy. Long-slit spectroscopy confirms the existence of a large-scale outflowin this galaxy. The entrained wind material has [N II] 6583/H-alpha ratios inexcess of unity while the disk material is characterized by H II region-likeline ratios indicative of a starburst. Expansion velocities of order 250 km/sare detected in the wind material, and a lower limit of 2 x 10^{53} ergs isderived for the kinetic energy of the outflow based on the gas kinematics andthe amount of ionized material entrained in the outflow. This is the first timeto our knowledge that a galactic wind is discovered using excitation maps. Thisline ratio technique represents a promising new way to identify wind galaxycandidates before undergoing more time-consuming spectroscopic follow-ups. Thismethod of selection may be particularly useful for samples of galaxies atmoderate redshifts.Comment: 9 pages and 2 gif-style figures; accepted for publication in the  Astrophysical Journal Letter

Identification of Galactic Wind Candidates Using Excitation Maps: Tunable-Filter Discovery of a Shock-excited Wind in the Galaxy NGC 1482