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Observations of OH and H2O Maser Emission in the Star-Forming Region S128

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Abstract

Results of monitoring hydroxyl and water masers in the star-forming region S128 are presented. A large number of emission features in the 1665 MHz OH line have been detected in both circular polarizations. In spite of the strong variability of the flux density in the main 1665 MHz line, the radial velocities of the features remained constant. Zeeman splitting of the 1720MHz line equal to 0.86 km/s was detected, corresponding to a longitudinal magnetic field of 3.6 mG. The variability of the H2O emission has a cyclic character with a quasi-period of 4–14 yrs. The evolution of individual features confirms that the H2O sources A and B are associated with an ionization front between two colliding CO clouds, and shows that the activity was transferred from maser B to maser A in 1999–2001.

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Authors and Affiliations

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

    N. T. Ashimbaeva, E. E. Lekht, M. I. Pashchenko & G. M. Rudnitskii

  2. LESIA, Observatoire de Paris-Meudon, CNRS, UPMC, Université Paris-Diderot, 92195, Meudon Cedex, France

    P. Colom

  3. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia

    A. M. Tolmachev

Authors
  1. N. T. Ashimbaeva
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  2. P. Colom
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  3. E. E. Lekht
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  4. M. I. Pashchenko
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  5. G. M. Rudnitskii
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  6. A. M. Tolmachev
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Correspondence to E. E. Lekht.

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Original Russian Text © N.T. Ashimbaeva, P. Colom, E.E. Lekht, M.I. Pashchenko, G.M. Rudnitskii, A.M. Tolmachev, 2018, published in Astronomicheskii Zhurnal, 2018, Vol. 95, No. 9, pp. 645–658.

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Ashimbaeva, N.T., Colom, P., Lekht, E.E. et al. Observations of OH and H2O Maser Emission in the Star-Forming Region S128. Astron. Rep. 62, 609–622 (2018). https://doi.org/10.1134/S1063772918090019

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  • DOI: https://doi.org/10.1134/S1063772918090019

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