Detection of a Sub-Keplerian Water Maser Disk at the Active Galactic Nucleus of the Galaxy IC 1481

Details Detection of a Sub-Keplerian Water Maser Disk at the Active Galactic Nucleus of the Galaxy IC 1481 Detection of a Sub-Keplerian Water Maser Disk at the Active Galactic Nucleus of the Galaxy IC 1481

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61.1143m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.5, pp.1143--1151

Astronomy and Astrophysics

Astronomy

4

Galaxies: Active, Galaxies: Individual (Ic 1481), Galaxies: Nuclei, Masers

Scientific paper

We present a study of H2O maser emission from the LINER, IC 1481, based on single-dish and highly sensitive VLBI observations. The Nobeyama 45-m telescope detected new maser features near the systemic velocity and blue-shifted by 124-205 km s-1. In addition, the known features red-shifted by ≈97-155 km s-1 were monitored. VLBI observations with the High Sensitivity Array (HSA) revealed that the maser features are distributed along a line, with a velocity gradient, strongly suggesting a nearly edge-on molecular gas disk. The radius and thickness of the disk are r = 2.8-14.0 pc and 2H = 1.5-4.2 pc, respectively, which are the largest among the maser disks detected in active galactic nuclei. The disk is rotating at Vrot = 124-168 km s-1, having a large velocity dispersion of ∆V ≈ 31 km s-1. The rotation curve of the disk is sub-Keplerian (Vrot ∝ r-0.19±0.04), indicating a massive disk. The disk mass is estimated to be (4.3±0.3) × 107Modot and the mass of a putative central black hole is <107Modot. The massive disk is gravitationally unstable. A radio continuum source was also detected to be offset from the maser disk by 1.6 pc.

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