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The H2O Maser G25.65+1.05 Flared Again

ATel #11042; Nuriya T. Ashimbaeva, Mikhail A. Platonov, Georgij M. Rudnitskij (Moscow State University, Sternberg Astronomical Institute), Alexandr M. Tolmachev (Pushchino Radio Astronomy Observatory)
on 8 Dec 2017; 18:45 UT
Credential Certification: Georgij Rudnitskij (gmr@sai.msu.ru)

Subjects: Radio, Request for Observations, Transient, Young Stellar Object

Three strong flares of the H2O maser G25.65+1.05 (IRAS 18316-0602, RAFGL 7009S) at a frequency of 22.235 GHz (November-December 2016, August-September and October 2017) were reported earlier (Lekht et al., arXiv:1709.08197; Volvach and Volvach, et al. 2017, ATel #10728, #10853). The 6.668-GHz methanol maser in the same object showed moderate flux rises nearly coincident with the H2O flares (Sugiyama et al., Atel #10757). On the basis of infrared K-band observations Sobolev et al. (2017, Atel #10788) concluded that the variability of the associated infrared source 2MASS 18342090-0559425 can be the cause of the H2O and methanol maser variations in G25.65+1.05. Hereby we report another strong short-living flare of the H2O 22.235-GHz maser G25.65+1.05 in November 2017. We observed it at the 22-meter radio telescope of the Pushchino Radio Astronomy Observatory (Russia). The peak flux density at VLSR = 42.1 km/s rose from ~20 kJy to 76 kJy within half a day November 20 and then rapidly faded to 16 kJy on November 22. The spectra can be found at the link indicated below. This work was supported by the Russian Foundation for Basic Research (project code 15-02-07676).

H2O spectra of G25.65+1.05 on November 20-22, 2017