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Water-vapor maser disk at the nucleus of the Seyfert 2 IC 2560

Published online by Cambridge University Press:  01 March 2007

Aya Yamauchi ,
Naomasa Nakai ,
Yuko Ishihara ,
Philip Diamond  and
Naoko Sato
Aya Yamauchi
Affiliation:
University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8571, Japan email: [email protected]
Naomasa Nakai
Affiliation:
University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8571, Japan email: [email protected]
Yuko Ishihara
Affiliation:
Koriyama City Fureai Science Center, 2-11-1 Ekimae, Koriyama, Fukushima 963-8002, Japan
Philip Diamond
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire, SK11 9DL, UK
Naoko Sato
Affiliation:
Wakayama University, 930 Sakaedani, Wakayama, Wakayama 640-8510, Japan
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Abstract

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We observed the H2O maser at the nucleus of the Seyfert 2, IC 2560, using the VLBA and the phased VLA. The systemic, red-shifted and blue-shifted maser features and a continuum component have been detected. We propose a maser disk in the nuclear region. The systemic and red-shifted features are emitted from a nearly edge-on disk with the position angle of PA = −47°. The thickness is 2H < 0.025 pc. The binding mass is 3.5 × 106M⊙. Assuming the Keplerian rotation, the radii at the disk are r = 0.087-0.335 pc and the rotation velocities are 213–418 km s−1. The mean density within the inner radius is 1.3 × 109M⊙ pc−3, suggesting a massive black hole at the center. A continuum component is considered as a jet ejected from the nucleus, with an angle of 70° from the disk. The blue-shifted maser feature is located on the continuum component, being interpreted to be a ‘jet maser’.

Keywords

galaxies:activegalaxies:individual (IC 2560)galaxies:nucleigalaxies: Seyfert
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 412 - 413
Copyright
Copyright © International Astronomical Union 2008

References

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