Infrared Fabry-Perot Imaging of M82 [Fe II] Emission. II. Tracing Extragalactic Supernova Remnants
NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
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We report high spatial and spectral resolution Fe II 1.644 km Fabry-Perot imaging observations of M82. We present extinction-corrected Fe II images and discuss the nature of compact Fe II emission regions revealed by these new data. We conclude that these Fe II sources trace a population of supernova remnants in M82 that are substantially older than those revealed previously on 6 cm radiographs. In addition, we find that M82 contains a distributed Fe II emission component that is extended along the southern minor axis and that accounts for 90 of the galaxys Fe II luminosity. We interpret this extended emission as tracing disk material entrained in a super wind that has broken out of the galactic disk to the south. We find that the Fe IIBry line ratio throughout M82 correlates with the age of the starburst as reflected by the color of the photospheric emission from the galaxys stars. This correlation suggests that the Fe II emission regions in M82 are colocated with a post-main-sequence stellar population. The engineering details of our Fabry-Perot imaging methodology are also discussed.