Circumnuclear emission-line region of the Seyfert galaxy NGC 5953: Evidence for an anisotropic nuclear radiation field

Details Circumnuclear emission-line region of the Seyfert galaxy NGC 5953: Evidence for an anisotropic nuclear radiation field Circumnuclear emission-line region of the Seyfert galaxy NGC 5953: Evidence for an anisotropic nuclear radiation field

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..761y&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan, vol. 45, no. 6, p. 761-773

Astronomy and Astrophysics

Astronomy

13

Disk Galaxies, Nuclear Radiation, Seyfert Galaxies, Starburst Galaxies, Astronomical Spectroscopy, Charge Coupled Devices, Ionized Gases, Star Formation

Scientific paper

The results of the spectroscopy of the circumnuclear emission-line region of the Seyfert 2 galaxy NGC 5953 are presented. We find that the Seyfert nucleus is surrounded by luminous extended star-forming region. Further, we find a high-ionization region at about 4 sec north-east from the nucleus. The ionization properties of this high-ionization region are well explained by photoionization due to a power-law continuum source, which provides evidence for anisotropic radiation from the Seyfert nucleus. If this is the case, the intrinsic nuclear ionizing radiation is probably ten-times more luminous than that observed. Finally, we show that the integrated spectrum of the emission-line region of NGC 5953 resembles those of some starburst nuclei. This fact implies that some fraction of objects classified as starburst nuclei exhibit Seyfert activities in their nuclei.

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