Excited molecular hydrogen around the Seyfert nuclei of NGC 3227 and 4151

B. R. Fernandez, A. J. Holloway, J. Meaburn, A. Pedlar, C. G. Mundell

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18 Citations (SciVal)


High-resolution images of the nuclear regions of the Seyfert galaxies NGC 3227 and 4151 have been obtained in the H2 1-0 S(1) emission line (rest λ = 2.1218 μm) with the IRCAM3 camera on the 3.8-m UKIRT telescope. A 2arcsec elongation of the photoexcited H2 is observed in NGC 3227 that is coincident with the optical nucleus. Combined with other observations, this indicates the presence of a molecular disc surrounding the active nucleus with the interior being photoexcited. A 2×2.5 arcsec2 ring of excited H2 centred on the nucleus is partially observed in NGC 4151. This is believed to be part of a circumnuclear torus that contains ionized, atomic and molecular gas in an onion-skin structure.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 11 May 1999


  • Galaxies: individual: NGC 3227
  • Galaxies: individual: NGC 4151
  • Galaxies: nuclei
  • Galaxies: Seyfert
  • Infrared: galaxies
  • Molecular processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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