Superflares of H2O Maser Emission Toward the Protostellar Object G25.65+1.05 (IRAS 18316−0602)


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Resumo

The results of a study of the maser source IRAS 18316−0602 in the H2O line at λ = 1.35 cm are reported. The observations were carried out on the 22-m radio telescope of the Pushchino Radio Astronomy Observatory (Russia) from June 2002 until March 2017. Three superflares were detected, in 2002, 2010, and 2016, with peak flux densities of >3400, 19 000, and 46 000 Jy, respectively. An analysis of these superflares is presented. The flares took place during periods of high maser activity in a narrow interval of radial velocities (40.5–42.5 km/s), and could be associated with the passage of a strong shock. The emission of three groups of features at radial velocities of about 41, 42, and 43 km/s dominated during themonitoring. The flare in 2016 was accompanied by a considerable increase in the flux densities of several features with velocities of 35–56 km/s.

Sobre autores

E. Lekht

Lomonosov Moscow State University

Autor responsável pela correspondência
Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

M. Pashchenko

Lomonosov Moscow State University

Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

G. Rudnitskii

Lomonosov Moscow State University

Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

A. Tolmachev

Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute

Email: lekht@sai.msu.ru
Rússia, Pushchino, Moscow oblast’, 142290

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