FLASHING: Project overview-Reference-Cited by-同舟云学术

FLASHING: Project overview

Published:2023-10-03 Issue:6 Volume:75 Page:1183-1213
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Imai Hiroshi¹²^ORCID,Hamae Yuhki³,Amada Kei⁴,Nakashima Keisuke⁴,Shum Ka-Yiu⁴,Kasai Rina³,Gómez José F⁵,Uscanga Lucero⁶^ORCID,Tafoya Daniel⁷,Orosz Gabor⁸^ORCID,Burns Ross A⁹¹⁰^ORCID

Affiliation:

1. Amanogawa Galaxy Astronomy Research Center, Graduate School of Science and Engineering, Kagoshima University , 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan

2. Center for General Education, Institute for Comprehensive Education, Kagoshima University , 1-21-30 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan

3. Faculty of Science, Kagoshima University , 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan

4. Graduate School of Science and Engineering, Kagoshima University , 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan

5. Instituto de Astrofísica de Andalucía, CSIC, Glorieta de la Astronomía s/n , E-18008 Granada , Spain

6. Departamento de Astronomía, Universidad de Guanajuato , A.P. 144, 36000 Guanajuato, Gto. , Mexico

7. Department of Space, Earth and Environment, Chalmers University of Technology , Onsala Space Observatory, 439 92 Onsala , Sweden

8. Joint Institute for VLBI ERIC , Oude Hoogeveensedijk 4, 7991 PD Dwingeloo , the Netherlands

9. RIKEN Cluster for Pioneering Research , 2-1, Hirosawa, Wako-shi, Saitama 351-0198 , Japan

10. Department of Science, National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan

Abstract

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.

Funder

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

JSPS

Ministerio de Ciencia e Innovación

AEI

Australian Research Council

CAS

National Key Research and Development Program of China

ERC

East Asian Core Observatories Association

University of Guanajuato