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Long-term monitoring and interpretation of flares in the H2O maser emission of IRAS 16293–2422

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Abstract

The results of a study of the H2O and OH maser emission from the cool IR source IRAS 16293−2422 are presented. The observations analyzed were obtained in H2O lines with the 22-m telescope of the Pushchino Radio Astronomy Observatory during 1999–2015 and in OH lines with the Nanc¸ ay radio telescope (France). A large number of very strong flares of the H2O maser were detected, reaching fluxes of tens of thousands of Jansky. Individual features can form organized structures resembling chains ∼2 AU in length with a radial-velocity gradient along them. The observed drift of the H2O emission (2003–2004) in space and velocity (from 4.3 to 5.3 km/s) is not due solely to proper motion of the features. The other origin of the drift is a drift of the emission maximum during a flare as the shock consecutively excites spatially separated features in the structure in the form of a chain. The OH-line observations at 18 cm show that the emission remains unpolarized and thermal, with a line width of 0.7 km/s, which corresponds to a cloud temperature of ∼30 K.

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Authors and Affiliations

  1. LESIA, Observatoire de Paris–Meudon, CNRS, UPMC, Université Paris–Diderot, 5 place Jules Janssen, 92195, Meudon Cedex, France

    P. Colom

  2. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119991, Russia

    E. E. Lekht, M. I. Pashchenko & G. M. Rudnitskii

  3. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino (Moscow region), Russia

    A. M. Tolmachev

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  1. P. Colom
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Correspondence to E. E. Lekht.

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Original Russian Text © P. Colom, E.E. Lekht, M.I. Pashchenko, G.M. Rudnitskii, A.M. Tolmachev, 2016, published in Astronomicheskii Zhurnal, 2016, Vol. 93, No. 8, pp. 723–737.

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Colom, P., Lekht, E.E., Pashchenko, M.I. et al. Long-term monitoring and interpretation of flares in the H2O maser emission of IRAS 16293–2422. Astron. Rep. 60, 730–743 (2016). https://doi.org/10.1134/S1063772916080059

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  • DOI: https://doi.org/10.1134/S1063772916080059

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