Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306...97r&link_type=abstract
Astronomy and Astrophysics, v.306, p.97
Astronomy and Astrophysics
Astrophysics
10
Galaxies: Seyfert, Galaxies: Individual: Ngc 1667, Galaxies: Nuclei, Ism
Scientific paper
In this paper we investigate the physical properties in the circumnuclear and extranuclear regions of the Seyfert 2 galaxy NGC 1667. Long-slit, medium-resolution spectra are used to derive the ionization properties of the gas in nuclear and circumnuclear regions with the aid of a grid of photoionization models computed with the code CLOUDY 84. In the nuclear regions the high [NII] λ6583/Hα and [SII] λ6725/Hα ratios are best fitted assuming an overabundance of nitrogen and sulphur relative to the solar value in clouds photoionized by a `hard' power-law continuum. The Seyfert nucleus is surrounded by extended HII regions the ionization of which is only weakly influenced by the central engine. The star formation rates (SFR) in these regions are evaluated from the measured Hα luminosities and compared with the values derived from infrared data. The equivalent stellar content in terms of O5 stars estimated in the extranuclear regions, N(O5)~700 - 3000, is a strong evidence that an intense star formation activity is occurring in the inner 10kpc. The observed velocity curve is well fitted by a model of spherical gravitational potential and purely circular motions. We derived a mass M~1.3x10^11^Msun_ within a 30" (~9kpc) radius.
Radovich Mario
Rafanelli Piero
No associations
LandOfFree
Spectroscopy of circumnuclear and extranuclear emission line regions in Seyfert galaxies. I. NGC 1667. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectroscopy of circumnuclear and extranuclear emission line regions in Seyfert galaxies. I. NGC 1667., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopy of circumnuclear and extranuclear emission line regions in Seyfert galaxies. I. NGC 1667. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1153051