Published in
Cambridge University Press, Proceedings of the International Astronomical Union, S242(3), p. 406-407, 2007
DOI: 10.1017/s1743921307013488
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Positional coincidence between an H2O maser and a plasma torus in NGC 1052
,
S. Kameno,
K. Nakamura,
D. Namikawa,
K. M. Shibata,
M. Inoue
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Abstract
AbstractWe 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.