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

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

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.305..319f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 2, pp. 319-324.

Astronomy and Astrophysics

Astronomy

19

Molecular Processes, Galaxies: Individual: Ngc 3227, Galaxies: Individual: Ngc 4151, Galaxies: Nuclei, Galaxies: Seyfert, Infrared: Galaxies

Scientific paper

High-resolution images of the nuclear regions of the Seyfert galaxies NGC 3227 and 4151 have been obtained in the H_2 1-0 S(1) emission line (rest lambda = 2.1218 mu m) with the IRCAM3 camera on the 3.8-m UKIRT telescope. A 2" elongation of the photoexcited H_2 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 x 2.5 arcsec^2 ring of excited H_2 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.

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