Synchronized periodic maser flares of multiple OH and CH3OH lines in G323.459–0.079

Autor:	S. P. van den Heever, J. A. Green, Derck P. Smits, G. C. MacLeod
Rok vydání:	2021
Předmět:	Physics 010308 nuclear & particles physics Space and Planetary Science law 0103 physical sciences Astronomy and Astrophysics Astrophysics Maser 010303 astronomy & astrophysics 01 natural sciences law.invention
Zdroj:	Monthly Notices of the Royal Astronomical Society. 502:5658-5667
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/stab462
Popis:	The first confirmed periodically varying 6.031 and 6.035 GHz hydroxyl masers are reported here. They vary contemporaneously with the 6.7 GHz methanol masers in G323.459–0.079. The 1.665 GHz hydroxyl and 12.2 GHz methanol masers associated with G323.459–0.079 are also periodic. Evidence for periodicity is seen in all features in all transitions save a single 1.665 GHz hydroxyl maser feature. Historical excited-state hydroxyl maser observations set a stricter upper limit on the epoch in which a significant accretion event occurred. The associated burst in 6.7 GHz methanol maser activity has subsided significantly while the hydroxyl transitions are brightening possibly the result of changing physical conditions in the masing cloudlets. Time lags in methanol are confirmed and may be the result of the periodic flaring propagating outward from the central region of maser activity. A possible magnetic field reversal occurred during the accretion event.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c5d8ac91a7a284781ee96370a6b15a9f https://doi.org/10.1093/mnras/stab462 Zobrazit plný text záznamu