Discovery of a luminous water megamaser in the FRII radiogalaxy 3C403

Details Discovery of a luminous water megamaser in the FRII radiogalaxy 3C403 Discovery of a luminous water megamaser in the FRII radiogalaxy 3C403

2003-07-03

arxiv.org/abs/astro-ph/0307068v1

Astron.Astrophys.407:L33-L36,2003

Astronomy and Astrophysics

Astrophysics

Four pages. One figure. To be published in Astronomy and Astrophysics Letters

Scientific paper

10.1051/0004-6361:20031062

We report the first detection of a water megamaser in a radio-loud galaxy, 3C403. This object has been observed as part of a small sample of FRIIs with evidence of nuclear obscuration. The isotropic luminosity of the maser is ~1200 L(sun). With a recessional velocity of cz ~ 17680 km/s it is the most distant water maser so far reported. The line arises from the densest interstellar gas component ever observed in a radio-loud galaxy. Two spectral features are observed, likely bracketing the systemic velocity of the galaxy. These may either arise from the tangentially seen parts of a nuclear accretion disk or from dense warm gas interacting with the radio jets.

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