Imaging polarimetry of the galaxy NGC 4151 - Further constraints on the geometry of the narrow emission line region

Details Imaging polarimetry of the galaxy NGC 4151 - Further constraints on the geometry of the narrow emission line region Imaging polarimetry of the galaxy NGC 4151 - Further constraints on the geometry of the narrow emission line region

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..309d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 309-316. Research support

Astronomy and Astrophysics

Astronomy

11

Astronomical Polarimetry, Emission Spectra, Galactic Structure, Radio Emission, Seyfert Galaxies, Active Galactic Nuclei, Interstellar Magnetic Fields, Radio Jets (Astronomy)

Scientific paper

NGC 4151 shows structure in the levels and pattern of polarization on all size-scales. On the large scale the polarization pattern tends to follow the spiral structure of the galaxy which can be traced to within about 20 arcsec of the nucleus in the I waveband. In the V and H alpha wavebands there is a jet-like structure of polarized (scattered) light at position angle 230 deg which coincides with the ENLR while the nuclear polarization is orthogonal to the arcsec-scale radio jets at position angles of about 80 deg. The results show that there are polarization features, arising from the scattering of light from the central nucleus, allied to both the radio and ENLR collimation axes. It is suggested that there are anisotropic distributions of dust associated with both the radio plasma and UV outflows which are themselves misaligned by about 20 deg and create the narrow-line regions.

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