NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-21 T02:34:26 PDT
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For refcode 1999MNRAS.305..319F:
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NED Abstract

Copyright by Royal Astronomical Society. 1999MNRAS.305..319F Excited molecular hydrogen around the Seyfert nuclei of NGC 3227 and 4151 B. R. Fernandez, A. J. Holloway, J. Meaburn, A. Pedlar and C. G. Mundell Accepted 1998 December 15. Received 1998 November24; in original form 1998 June 24 ABSTRACT 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 microns) 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. Keywords: molecular processes galaxies: individual: NGC 3227 galaxies: individual: NGC 4151 galaxies: nuclei galaxies: Seyfert infrared: galaxies
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