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POSITIONAL COINCIDENCE BETWEEN WATER MASERS AND A PLASMA TORUS IN NGC 1052

  • SAWADA-SATOH SATOKO (Academia Sinica Institute of Astronomy and Astrophysics) ;
  • KAMENO SEIJI (National Astronomical Observatory of Japan) ;
  • SHIBATA KATSUNORI M. (National Astronomical Observatory of Japan) ;
  • INOUE MAKOTO (National Astronomical Observatory of Japan)
  • Published : 2005.06.01

Abstract

We present results of the VLBA observation toward the radio continuum and water maser emissions in a nearby LINER galaxy NGC 1052. The jet structure observed in 2000 is similar to that in 1998, and the two jet structures in 1998 and 2000 support the sub-luminal motion with apparent velocity of 0.26c. Distribution of water maser spots are located ${\~}$0.05 pc shifted to southwest from the component which is supported to be the nucleus, and no rapid positional change of the water maser gas with respect to the central engine is seen from 1995 to 2000. The maser gas is positionally coincident with a plasma torus, and the position of the maser gas relative to the nucleus is stable from 1995 to 2000. The maser gas in NGC 1052 could be explained to be associated with the nuclear circumnuclear torus or disk like the situation found in the nucleus of NGC 4258.

Keywords

galaxies: active;galaxies: individual (NGC 1052, PKS B0238-084, J0241-0815);galaxies: nuclei;masers;radio lines: galaxies

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