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6.7 GHz variability characteristics of new periodic methanol maser sources

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dc.contributor.author Olech, Mateusz
dc.contributor.author Szymczak, Marian
dc.contributor.author Wolak, Paweł
dc.contributor.author Sarniak, Rafał
dc.contributor.author Bartkiewicz, Anna
dc.date.accessioned 2020-10-01T09:40:45Z
dc.date.available 2020-10-01T09:40:45Z
dc.date.issued 2019-04-01
dc.identifier.citation MNRAS vol.486, 2019, pp. 1236–1254
dc.identifier.other 10.1093/mnras/stz926
dc.identifier.uri http://repozytorium.umk.pl/handle/item/6364
dc.description.abstract Discovery of periodic maser emission was an unexpected result from monitoring observations of methanol transitions in high-mass young stellar objects. We report on the detection of five new periodic sources from a monitoring program with the Torun 32 m telescope. Variability with a period of 149 to 540 d and different patterns from sinusoidal-like to intermittent was displayed. Three-dimensional structure of G59.633−0.192 determined from the time delays of burst peaks of the spectral features and high angular resolution map implies that the emission traces a disc. For this source the 6.7 GHz light curve followed the infrared variability supporting a radiative scheme of pumping. An unusual time delay of ∼80 d occurred in G30.400−0.296 could not be explained by the light travel time and may suggest a strong differentiation of physical conditions and excitation in this deeply embedded source. Our observations suggest the intermittent variability may present a simple response of maser medium to the underlying variability induced by the accretion luminosity while other variability patterns may reflect more complex changes in the physical conditions.
dc.description.sponsorship Narodowe Centrum Nauki
dc.language.iso eng
dc.publisher Monthly Notices of the Royal Astronomical Society
dc.subject masers
dc.subject stars: formation
dc.subject ISM: clouds
dc.subject radio lines:ISM
dc.title 6.7 GHz variability characteristics of new periodic methanol maser sources
dc.type info:eu-repo/semantics/article
dc.contributor.supervisor Szymczak, Marian


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