Monitoring a methanol maser flare associated with the massive star-forming region G358.93–0.03

Monitoring a methanol maser flare associated with the massive star-forming region G358.93–0.03

ABSTRACT We report the earliest detection of the 19.967-GHz [transition 21–30E (t = 0)] methanol maser associated with the massive star-forming region G358.93–0.03. The flare was detectable from 2019 January 23 to March 5, for only 44 d. It turned out to be the most powerful 19.967-GHz maser in the...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society. Letters 2020-05, Vol.494 (1), p.L59-L63
Hauptverfasser: Volvach, A E, Volvach, L N, Larionov, M G, MacLeod, G C, van den Heever, S P, Sugiyama, K
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container_issue 1
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container_title Monthly notices of the Royal Astronomical Society. Letters
container_volume 494
creator Volvach, A E
Volvach, L N
Larionov, M G
MacLeod, G C
van den Heever, S P
Sugiyama, K
description ABSTRACT We report the earliest detection of the 19.967-GHz [transition 21–30E (t = 0)] methanol maser associated with the massive star-forming region G358.93–0.03. The flare was detectable from 2019 January 23 to March 5, for only 44 d. It turned out to be the most powerful 19.967-GHz maser in the Galaxy in the entire history of observations, taking into account the 104-Jy flux from it on the Earth’s surface and the distance to the source, 6.75 kpc. The 19.967-GHz maser flared contemporaneously with the first of two flares detected in associated 20.971-GHz methanol masers. We estimated that the ratio of flux densities between these two transitions is F20.971/F19.967 = 14 ± 4, increasing to >520 in the second flare. We discuss the differences between the two flares in the 20.971-GHz methanol masers and the consequence thereof.
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title Monitoring a methanol maser flare associated with the massive star-forming region G358.93–0.03
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