Ne II 12.8 micron emission and galactic dynamics in M82

S.C. Beck, J.H. Lacy, F. Baas, C.H. Townes

Research output: Contribution to journalArticlepeer-review


Ne II fine-structure emission at 12.8 μm from the galaxy M82 has been spatially and spectrally resolved. This radiation is relatively unaffected by obscuration, scattering, or maser amplification, and should hence provide a more reliable map of the velocity field within the galaxy than do optical or radio observations. A recessional velocity of 215±20 km s-1 is found for the galaxy, and a much steeper rotation curve is obtained than that from optical measurements. Furthermore, there is evidence for large-scale noncircular motion of the gas within the inner 150 pc of the nebula. The results are consistent with the idea that the peculiarities of M82 are due to collision with an intergalactic dust cloud as suggested by Solinger, Morrison, and Markert (1977).
Original languageEnglish
Pages (from-to)545 - 9
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1978


  • astronomical spectra
  • collision processes
  • dynamics
  • galaxies
  • infrared astronomical observations
  • infrared sources (astronomical)
  • intergalactic matter
  • red shift
  • rotating bodies


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