Area spectroscopy of the extended emission-line region in the Seyfert galaxy NGC 3516

Details Area spectroscopy of the extended emission-line region in the Seyfert galaxy NGC 3516 Area spectroscopy of the extended emission-line region in the Seyfert galaxy NGC 3516

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..539a&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 6, p. 539-552

Astronomy and Astrophysics

Astrophysics

7

Galactic Nuclei, Line Spectra, Optical Emission Spectroscopy, Seyfert Galaxies, Astronomical Models, H Alpha Line, H Beta Line, Nitrogen, Oxygen, Sulfur

Scientific paper

We performed an area spectroscopic observation of the extended emission-line region (EELR) in the Seyfert 1 galaxy NGC 3516 with the Spectronebulagraph of Okayama Astrophysical Observatory. The whole EELR, including the northern detached component which lies apart by 20 sec (4 kpc) from the nucleus, was scanned with a 4.5 min long slit. From the resulting data cube we reproduced pure narrow emission-line images of H beta, (O III), H alpha, (N II), and (S II). From these images it has been found that the excitation is higher toward the northern detached component from the nucleus, and probably also toward the opposite direction. The northern detached component is ionized by power-law ionizing radiation as well as a Z-shaped component. From the kinematics, the northern detached component lies on the galactic disk. There is a considerable deficit of ionizing photons toward the line of site in spite of the fact that the broad-line region can be clearly seen from us. It seems that collimation of the ionizing radiation from the nucleus is caused in or inside the broad line region. Thus, a simple version of the current unified scheme of Seyfert nuclei may not apply to this typical Seyfert 1 galaxy, as in the case of the NGC 4151.

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