Luminous infrared galaxies. II. NGC 4945

A nearby obscured starburst/seyfert nucleus

Sebastian Lípari, Zlatan Tsvetanov, F. Macchetto

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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 Hα + [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 Hα + [N II] and [S II] appear in emission. The long-slit spectroscopy at P.A. = 90°, coincident with the main Hα 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°) is clearly asymmetric, with the mean velocity shifted toward the obscured nuclear region.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalAstrophysical Journal, Supplement Series
Volume111
Issue number2
DOIs
Publication statusPublished - Aug 1997
Externally publishedYes

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filaments
galaxies
nuclei
spectroscopy
slits
cones
kinematics
apertures
continuums
curves
radiation

Keywords

  • Galaxies: individual (NGC 4945)
  • Galaxies: kinematics and dynamics
  • Galaxies: nuclei
  • Galaxies: seyfert
  • Galaxies: structure

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Luminous infrared galaxies. II. NGC 4945 : A nearby obscured starburst/seyfert nucleus. / Lípari, Sebastian; Tsvetanov, Zlatan; Macchetto, F.

In: Astrophysical Journal, Supplement Series, Vol. 111, No. 2, 08.1997, p. 369-375.

Research output: Contribution to journalArticle

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abstract = "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 Hα + [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 Hα + [N II] and [S II] appear in emission. The long-slit spectroscopy at P.A. = 90°, coincident with the main Hα 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°) is clearly asymmetric, with the mean velocity shifted toward the obscured nuclear region.",
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T2 - A nearby obscured starburst/seyfert nucleus

AU - Lípari, Sebastian

AU - Tsvetanov, Zlatan

AU - Macchetto, F.

PY - 1997/8

Y1 - 1997/8

N2 - 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 Hα + [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 Hα + [N II] and [S II] appear in emission. The long-slit spectroscopy at P.A. = 90°, coincident with the main Hα 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°) is clearly asymmetric, with the mean velocity shifted toward the obscured nuclear region.

AB - 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 Hα + [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 Hα + [N II] and [S II] appear in emission. The long-slit spectroscopy at P.A. = 90°, coincident with the main Hα 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°) is clearly asymmetric, with the mean velocity shifted toward the obscured nuclear region.

KW - Galaxies: individual (NGC 4945)

KW - Galaxies: kinematics and dynamics

KW - Galaxies: nuclei

KW - Galaxies: seyfert

KW - Galaxies: structure

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