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On the Flare Activity of the H\({}_{2}\)O Maser in DR21OH

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Abstract

An H\({}_{2}\)O maser flare detected in July 2023 in the star-forming region DR21OH when monitoring the continuum emission in DR21 with PRAO RT22 is reported. These observations were part of a program to study the characteristics of the antenna and the atmospheric absorption at a wavelength of 1.35 cm. Subsequent access to archival data and new measurements have shown that the detected flare in 2023 was not the only one in the source, and DR21OH is highly variable in the H\({}_{2}\)O line at 22 GHz with a rather unpredictable character. Based on continuum measurements in DR21, we have estimated the effective area of RT22.

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ACKNOWLEDGMENTS

We are very grateful to all of the technical and maintenance staff of PRAO RT22.

Funding

This study was supported by the Russian Science Foundation (project no. 23-22-00227, https://rscf.ru/project/23-22-00227/).

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Authors and Affiliations

  1. Gaponov-Grekhov Institute of Applied Physics, Russian Academy of Sciences, 603950, Nizhny Novgorod, Russia

    A. V. Lapinov, A. K. Kiselev & N. I. Lapin

  2. Pushchino Radio Astronomy Observatory (PRAO), Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, 142290, Pushchino, Moscow obl., Russia

    A. M. Tolmachev

  3. Minin University, 603002, Nizhny Novgorod, Russia

    A. K. Kiselev, N. I. Lapin, I. A. Startseva & A. S. Loginova

  4. Lobachevsky Nizhny Novgorod State University, 603022, Nizhny Novgorod, Russia

    S. A. Lapinova

  5. National Research University ‘‘Higher School of Economics’’, 101100, Moscow, Russia

    S. A. Lapinova

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  1. A. V. Lapinov
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  2. A. M. Tolmachev
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  3. A. K. Kiselev
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  4. N. I. Lapin
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  5. S. A. Lapinova
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  6. I. A. Startseva
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  7. A. S. Loginova
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Correspondence to A. V. Lapinov.

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Translated by V. Astakhov

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Lapinov, A.V., Tolmachev, A.M., Kiselev, A.K. et al. On the Flare Activity of the H\({}_{2}\)O Maser in DR21OH. Astron. Lett. 50, 62–69 (2024). https://doi.org/10.1134/S1063773724600140

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