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Positional coincidence between an H2O maser and a plasma torus in NGC 1052

Published online by Cambridge University Press:  01 March 2007

S. Sawada-Satoh ,
S. Kameno ,
K. Nakamura ,
D. Namikawa ,
K. M. Shibata  and
M. Inoue
S. Sawada-Satoh
Affiliation:
ASIAA, P.O. Box 23-141, Taipei 10617, TAIWAN email: [email protected]
S. Kameno
Affiliation:
Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065 JAPAN
K. Nakamura
Affiliation:
Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065 JAPAN
D. Namikawa
Affiliation:
Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065 JAPAN
K. M. Shibata
Affiliation:
NAOJ, Osawa, Mitaka, Tokyo 181-8588 JAPAN
M. Inoue
Affiliation:
NAOJ, Osawa, Mitaka, Tokyo 181-8588 JAPAN
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Abstract

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We present VLBA observation towards the nucleus of a nearby radio galaxy NGC 1052. In NGC 1052, two-sided jet structure and a dense plasma circumnuclear torus with a radius of 0.7 pc have been found around the central mass. It emits a H2O megamaser, which is redshifted with respect to the systemic velocity of the galaxy (1491 kms−1) with a large velocity width of 100 kms−1 (FWHM). The maser gas is found at the inner jet components of both the approaching and receding jets. The maser gas is positionally coincident with a plasma torus. The maser gas in NGC 1052 could be explained as a circumnuclear torus or disk, as found for the nucleus of NGC 4258.

Keywords

galaxies: activegalaxies: individual(NGC 1052)galaxies: H2O maser
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 406 - 407
Copyright
Copyright © International Astronomical Union 2008

References

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