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Tridimensional Observations of Nearby Active Galaxies Using OAO Spectronebulagraph

Published online by Cambridge University Press:  12 April 2016

M. Yoshida
Affiliation:
Okayama Astrophysical Observatory, Kamogata-cho, Asakuchi-gun, Okayama 719-02, Japan
Y. Shimizu
Affiliation:
Okayama Astrophysical Observatory, Kamogata-cho, Asakuchi-gun, Okayama 719-02, Japan
H. Koyano
Affiliation:
Okayama Astrophysical Observatory, Kamogata-cho, Asakuchi-gun, Okayama 719-02, Japan
G. Kosugi
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-01, Japan
K. Aoki
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-01, Japan
H. Ohtani
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-01, Japan
T. Sasaki
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan
M. Sasaki
Affiliation:
Shimonoseki City University, Daigaku-cho, Shimonoseki, Yamaguchi 751, Japan
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Extract

We developed a slit-scanning type 3D-spectroscopic system named as Spectronebulagraph (hereafter SNG; Kosugi et al. 1994) at Okayama Astrophysical Observatory. A detailed description about SNG is presented by Ohtani et al. elsewhere in this colloquium. We present here the results of the 3D-spectroscopy of four nearby active galaxies by using SNG.

This nearby (at distance of 5.4 Mpc) Magellanic irregular galaxy has many H II regions in its main body suggesting violent star-formation activity. We performed tridimensional observations of NGC 4449 using SNG in order to obtain detailed kinematic structure and then to investigate the star-formation mechanism of NGC 4449. Hα intensity map, Hα velocity field are shown in figure 1. As is obvious in lower panel of figure 1, no global rotational motion was detected. Most impressive feature of the velocity field is kpc-scale mosaic structure of low velocity and high velocity components. Also, many filamentary components were newly found in 3D-datacube of the SNG observation.

Type
3. Integral Field Spectrographs and Spectrometers
Copyright
Copyright © Astronomical Society of the Pacific 1995

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