Infrared fabry-perot imaging of M82 [Fe II] emission. II. Tracing extragalactic supernova remnants

Matthew A. Greenhouse, Shobita Satyapal, Charles E. Woodward, J. Fischer, K. L. Thompson, W. J. Forrest, J. L. Pipher, N. Raines, H. A. Smith, D. M. Watson, R. J. Rudy

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We report high spatial and spectral resolution [Fe II] 1.644 μm 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 galaxy's [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 II]/Brγ line ratio throughout M82 correlates with the age of the starburst as reflected by the color of the photospheric emission from the galaxy's 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.

Original languageEnglish (US)
Pages (from-to)105-112
Number of pages8
JournalAstrophysical Journal
Issue number1 PART I
StatePublished - 1997


  • Galaxies: individual (M82)
  • Galaxies: stellar content
  • Galaxies: structure
  • Infrared: galaxies
  • Supernova remnants
  • Techniques: interferometric


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