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Title:
Subaru Spectropolarimetry of Markarian 573: The Hidden High-Ionization Nuclear Emission-Line Region inside the Dusty Torus
Authors:
Nagao, Tohru; Kawabata, Koji S.; Murayama, Takashi; Ohyama, Youichi; Taniguchi, Yoshiaki; Shioya, Yasuhiro; Sumiya, Ryoko; Sasaki, Shunji S.
Affiliation:
AA(Osservatorio Astrofisico di Arcetri, INAF, Largo Enrico Fermi 5, I-50125 Florence, Italy; .; Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AB(Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.), AC(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AD(Subaru Telescope, NAOJ, 650 North A`ohoku Place, University Park, Hilo, HI 96720.), AE(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AF(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AG(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AH(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.)
Publication:
The Astronomical Journal, Volume 128, Issue 5, pp. 2066-2072. (AJ Homepage)
Publication Date:
11/2004
Origin:
UCP
AJ Keywords:
Galaxies: Active, Galaxies: Individual: Name: Markarian 573, Galaxies: Nuclei, Galaxies: Seyfert, Polarization
DOI:
10.1086/424936
Bibliographic Code:
2004AJ....128.2066N

Abstract

We report the results of our high-quality spectropolarimetric observation of the narrow-line region in a nearby Seyfert 2 galaxy, Mrk 573, with the Subaru Telescope. The polarized flux spectrum of Mrk 573 shows not only prominent scattered broad Hα emission but also various narrow forbidden emission lines. We find that the measured polarization degree of the observed forbidden emission lines is positively correlated with the ionization potential of the corresponding ions and the critical density of the corresponding transitions. We discuss some possible origins of these correlations, and then we point out that the correlations are caused by the obscuration of the stratified narrow-line region in Mrk 573 by the optically and geometrically thick dusty torus, matching findings of a previous study of NGC 4258.

Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan (NAOJ).

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