Volume 628, August 2019
|Number of page(s)||4|
|Section||Interstellar and circumstellar matter|
|Published online||12 August 2019|
Flaring water masers associated with W49N
Radio Astronomy Laboratory of Crimean Astrophysical Observatory,
2 Institute of Applied Astronomy, Russian Academy of Sciences, St. Petersburg, Russia
3 Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow 117997, Russia
4 Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp 1740, South Africa
5 The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada
6 Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
7 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
8 National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand
9 INAF, Istituto di Radioastronomia, Via Gobetti 101, 40129 Bologna, Italy
10 Italian Alma Regional Centre, Istituto di Radioastronomia, Via Gobetti 101, 40129 Bologna, Italy
11 INAF, Observatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius (CA), Italy
Accepted: 11 July 2019
Aims. We present our monitoring observations and analysis of water masers associated with W49N taken in 2017 and 2018. A significant flare occurred during these observations.
Methods. We used ground-based radio telescopes in Simeiz (RT-22), Torun (RT-32), Medicina (RT-32), Effelsberg (RT-100) with broadband spectrometers. Observational data were collected and processed automatically.
Results. We report a powerful flare of the v = +6 km s−1 water maser feature; it increased in over ten months to S1.3 cm = 84 kJy in 2017 December, then decayed to the pre-flare quiescent value of S1.3 cm = 8.7 kJy in 2018 August. We infer that this flaring feature is unsaturated based on the relationship between line width and flux density.
Key words: masers / stars: formation / HII regions / radio lines: ISM
© ESO 2019
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.