Variability monitoring of the hydroxyl maser emission in G12.889+0.489
| Autor: | Maxim Voronkov, J. A. Green, Naomi McClure-Griffiths, James Caswell |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Phase (waves) Flux Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics law.invention Intensity (physics) Telescope Space and Planetary Science law Satellite line Maser Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 425:1504-1510 |
| ISSN: | 0035-8711 |
| Popis: | Through a series of observations with the Australia Telescope Compact Array we have monitored the variability of ground-state hydroxyl maser emission from G12.889+0.489 in all four Stokes polarisation products. These observations were motivated by the known periodicity in the associated 6.7-GHz methanol maser emission. A total of 27 epochs of observations were made over 16 months. No emission was seen from either the 1612 or 1720 MHz satellite line transitions (to a typical five sigma upper limit of 0.2 Jy). The peak flux densities of the 1665 and 1667 MHz emission were observed to vary at a level of ~20% (with the exception of one epoch which dropped by |
| Databáze: | OpenAIRE |
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