Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242..412y&link_type=abstract
Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.
Astronomy and Astrophysics
Astrophysics
Galaxies:Active, Galaxies:Individual (Ic 2560), Galaxies:Nuclei, Galaxies: Seyfert
Scientific paper
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 × 106 M. 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’.
Diamond Philip
Ishihara Yuko
Nakai Naomasa
Sato Naoko
Yamauchi Aya
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