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http://hdl.handle.net/20.500.12386/32833
Title: | Probing the Obscuring Medium Around Active Nuclei Using Masers: The Case of 3C 403 | Authors: | TARCHI, ANDREA Henkel, C. Chiaberge, M. Menten, K. M. Brunthaler, A. MOSCADELLI, Luca |
Issue Date: | 2005 | Volume: | Dense Molecular Gas Around Protostars and in Galactic Nuclei. European Workshop on Astronomical Molecules 2004 | Editors: | Baan, W.A.; Hagiwara, Y.; Langevelde, H.J. | First Page: | 117 | Abstract: | We report the first detection of a water megamaser in a radio-loud galaxy, 3C 403, and present a follow-up study using the VLA. 3C 403 has been observed as a part of a small sample of FR II galaxies with evidence of nuclear obscuration. The isotropic luminosity of the maser is ∼1200 Lʘ. With a recessional velocity of cz ∼- 17680 km s<SUP>-1</SUP> it is the most distant water maser so far reported. The line arises from the densest (>10<SUP>8</SUP> cm <SUP>-3</SUP>) interstellar gas component ever observed in a radio-loud galaxy. Two spectral features are identified, likely bracketing the systemic velocity of the galaxy. Our interferometric data clearly indicate that these arise from a location within 0.1″ (≈110 pc) from the active galactic nucleus. We conclude that the maser spots are most likely associated with the tangentially seen parts of a nuclear accretion disk, while an association with dense warm gas interacting with the radio jets cannot yet be ruled out entirely. | Conference Name: | Dense Molecular Gas Around Protostars and in Galactic Nuclei. | Conference Place: | Zwolle, the Netherlands | Conference Date: | February 18–20, 2004 | URI: | http://hdl.handle.net/20.500.12386/32833 | URL: | https://link.springer.com/book/10.1007/1-4020-3831-3 | ISBN: | 978-1-4020-3038-3 978-1-4020-3831-0 |
DOI: | 10.1007/1-4020-3831-3_14 | Bibcode ADS: | 2005dmgp.book..117T | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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File | Description | Size | Format | |
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Tarchi.pdf | PDF editoriale | 7.6 MB | Adobe PDF | View/Open |
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