Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apjs..111..369l&link_type=abstract
Astrophysical Journal Supplement v.111, p.369
Astronomy and Astrophysics
Astronomy
13
Galaxies: Individual Ngc Number: Ngc 4945, Galaxies: Kinematics And Dynamics, Galaxies: Nuclei, Galaxies: Seyfert, Galaxies: Structure
Scientific paper
We have studied the physical conditions, reddening, and kinematics in the nuclear and circumnuclear regions of the luminous IR source NGC 4945. The I-band image shows a wide cone of radiation that emerges from the partially obscured nuclear region. The H alpha + [N II] image reveals an extended nuclear region located at the same position as the I-band nucleus. Two extended filaments emerge from this region as well. Aperture optical spectroscopy of the nuclear region shows strong reddening in the continuum, and only the blends H alpha + [N II] and [S II] appear in emission. The long-slit spectroscopy at P.A. = 90 deg, coincident with the main H alpha filament, shows in the nuclear region a weak [O I] LINER or weak [O III] Seyfert spectrum and blueshifted broad components in the [N II] and [S II] lines that are probably associated with superwinds. The velocity curve (at P.A. = 90 deg) is clearly asymmetric, with the mean velocity shifted toward the obscured nuclear region.
Lipari Sebastian
Macchetto Ferdinando
Tsvetanov Zlatan
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