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Results of a long-term monitoring of the 1.35-cm water-vapor maser source ON 1 (1981–2013)

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Abstract

We present the results of our long-term monitoring of the 1.35-cm water-vapor maser source ON 1 performed at the 22-m radio telescope of the Pushchino Radio Astronomy Observatory from 1981 to 2013. Maser emissionwas observed in a wide range of radial velocities, from −60 to +60 km s−1. Variability of the integrated flux with a period of ∼9 years was detected. We show that the stable emission at radial velocities of 10.3, 14.7, and 16.5 km s−1 belongs to compact structures that are composed of maser spots with close radial velocities and that are members of two water-maser clusters, WMC 1 and WMC 2. The detected short-lived emission features in the velocity ranges from −30 to 0 and from 35 to 40 km s−1 as well as the high-velocity ones are most likely associated with a bipolar molecular outflow observed in the CO line.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia

    E. E. Lekht

  2. Pushchino Radio Astronomy Observatory, Astrospace Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow oblast, 142292, Russia

    V. V. Krasnov & A. M. Tolmachev

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  1. E. E. Lekht
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  2. V. V. Krasnov
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  3. A. M. Tolmachev
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Correspondence to E. E. Lekht.

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Original Russian Text © E.E. Lekht, V.V. Krasnov, A.M. Tolmachev, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, No. 9, pp. 611–626.

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Lekht, E.E., Krasnov, V.V. & Tolmachev, A.M. Results of a long-term monitoring of the 1.35-cm water-vapor maser source ON 1 (1981–2013). Astron. Lett. 40, 551–565 (2014). https://doi.org/10.1134/S1063773714080052

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  • DOI: https://doi.org/10.1134/S1063773714080052

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