Si X forbidden emission in NGC 1068 and NGC 7469

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This Letter presents the first observation of [Si X] emission in a celestial object other than the solar corona. The detected line at 1.430 μm is present in the spectra of both NGC 1068 and NGC 7469. The ionization potential of Si X is 401.4 eV, which makes this one of the highest ionization energy lines observed in active galactic nuclei. The line falls in a region of high telluric absorption that requires a fortuitous combination of redshift and abnormally dry observing conditions to observe.

Original languageEnglish (US)
Pages (from-to)L61-L63
JournalAstrophysical Journal
Issue number2 PART II
StatePublished - 1996


  • Galaxies: Active
  • Galaxies: Individual (NGC 1068, NGC 7469)
  • Galaxies: Seyfert
  • Infrared: Galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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