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- Title
FLASHING: Project overview.
- Authors
Imai, Hiroshi; Hamae, Yuhki; Amada, Kei; Nakashima, Keisuke; Shum, Ka-Yiu; Kasai, Rina; Gómez, José F; Uscanga, Lucero; Tafoya, Daniel; Orosz, Gabor; Burns, Ross A
- Abstract
This paper describes an overview of the FLASHING (Finest Legacy Acquisitions of SiO-/H2O-maser Ignitions by the Nobeyama Generation) project promoted using the 45 m telescope of Nobeyama Radio Observatory, which aims to intensively monitor H2O (at 22 GHz) and SiO (at 43 GHz) masers associated with so-called "water fountain" sources. Here we show scientific results based on the data taken in the first five seasons of FLASHING, from 2018 December to 2023 April. We show the evolution of the H2O maser spectra, discovering new spectral components that break the record of the jet's top speed and/or systematic velocity drifts in the spectrum indicating acceleration or deceleration of the maser gas clumps. For the 43 GHz SiO maser emission, we newly detect it in one source and find that it is no longer present in another source. This implies that the jets from these water fountains can be accelerated or decelerated, and show how circumstellar envelopes are destroyed.
- Subjects
FOUNTAINS; WATER jets; MASERS; RADIO telescopes; STELLAR winds
- Publication
Publications of the Astronomical Society of Japan, 2023, Vol 75, Issue 6, p1183
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psad064