Bibcode
DOI
Mediavilla, E.; Arribas, S.; Rasilla, J. L.
Bibliographical reference
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. 517-541.
Advertised on:
9
1992
Journal
Citations
24
Refereed citations
19
Description
Sixty-one bidimensionally distributed spectra covering the circumnuclear
region of NGC 4161 within a radius of about 6.5 arcsec are presented.
The local conditions and the mean velocity field are studied from an
analysis of the H-alpha, forbidden N II 6548, 6584, and forbidden S II
6716, 6731 lines. The alignment of the line intensity maps in the
direction of higher ionization is confirmed. The electron density is
fairly isotropically distributed, although at the inner parts it seems
to be more aligned with the major radio axis. Its radial dependence is
consistent with an r exp -1.5 law. A relatively low-ionization zone
extending about 350 pc is found around the nucleus. The bidimensional
distribution of line broadening is anisotropic, roughly transverse to
the direction of higher ionization. Although the morphological picture
which may be inferred for the circumnuclear region of NGC 4151 is
complex, showing anisotropic features, a gradual connection between the
galaxy and the nucleus is also found.