Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63l...9h&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.63, No.1, pp.L7--L11
Astronomy and Astrophysics
Astronomy
Galaxies: Individual (Ngc 1068), Galaxies: Nuclei, Galaxies: Seyfert
Scientific paper
We present J-band long-slit spectroscopic observation of NGC 1068 classified as a Seyfert 2 galaxy. J-band observations with OAO/ISLE provide clear detection of spatially extended [Fe II] 1.257 µm and [P II] 1.188 µm lines. We found that [Fe II] 1.257 µm/[P II] 1.188 µm increases with distance from a central continuum peak. Observed line ratios around the nucleus (continuum peak) are consistent with a typical value expected from photoionization models, while the ratios at 3''-4'' (210-280 pc) east and west of the nucleus are slightly higher than this. In the off nucleus region of NGC 1068 we also found a possible association between [Fe II] 1.257 µm/[P II] 1.188 µm and the radio continuum. This suggests a mild contribution of shock ionization induced by a radio jet outside nucleus while photoionization by the central energy source is dominant near the nucleus.
Araki Nobuo
Hashimoto Tetsuya
Matsuoka Kenta
Nagao Tohru
Yanagisawa Kenshi
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