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Search for a fast variability of OH maser emission in sources W3, W49, W51 and W75 for the period 2015 - 2017

I. V. Gosacinskij, A. V. Ipatov, S. A. Grenkov, I. A. Rahimov

Transactions of IAA RAS, issue 47, 91–100 (2018)

Keywords: cosmic maser radio emission, variability of hydroxyl masers, spectral observations, fast variability.

Abstract

We report the results of three-year observations of OH masers at 1665 MHz with characteristic times of flux variations from minutes to hours carried out with the 32-m antenna of Svetloe Radio Astronomical Observatory. It is discovered in W75 as many as four spectral detales with radial velocities of -4.5, +0.6, +5.2 and +5.4 km/s in the both circular polarisatons, emission of wich changed on several tens percent during lower than hour. In the W51 emission of spectral detale was found rater stable. In the W49 we have found three variable detales with radial velocities of +17.1, +18.3 and +18.5 km/s in the right circular polarisation. The most strange were found the flux variations of two detales in the OH spectrum of W3 with radial velocities of -47.6 and -45.1 km/s first discovered by us in 2013 − 2014. These variations have almost sinusoidal form with periods near 24 h and anticorrelated in right and left circular polarisations. We have showed that such variations can not be any of instrumental effects, but for now have not any reasonable explanation.

Citation

Text

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RIS

I. V. Gosacinskij, A. V. Ipatov, S. A. Grenkov, I. A. Rahimov. Search for a fast variability of OH maser emission in sources W3, W49, W51 and W75 for the period 2015 - 2017 // Transactions of IAA RAS. — 2018. — Issue 47. — P. 91–100.

@article{gosacinskij2018,
  abstract = {We report the results of three-year observations of OH masers at 1665 MHz with characteristic times of flux variations from minutes to hours carried out with the 32-m antenna of Svetloe Radio Astronomical Observatory. It is discovered in W75 as many as four spectral detales with radial velocities of -4.5, +0.6, +5.2 and +5.4 km/s in the both circular polarisatons, emission of wich changed on several tens percent during lower than hour. In the W51 emission of spectral detale was found rater stable. In the W49 we have found three variable detales with radial velocities of +17.1, +18.3 and +18.5 km/s in the right circular polarisation. The most strange were found the flux variations of two detales in the OH spectrum of W3 with radial velocities of -47.6 and -45.1 km/s first discovered by us in 2013 − 2014. These variations have almost sinusoidal form with periods near 24 h and anticorrelated in right and left circular polarisations. We have showed that such variations can not be any of instrumental effects, but for now have not any reasonable explanation.},
  author = {I.~V. Gosacinskij and A.~V. Ipatov and S.~A. Grenkov and I.~A. Rahimov},
  doi = {10.32876/ApplAstron.47.91-100},
  issue = {47},
  journal = {Transactions of IAA RAS},
  keyword = {cosmic maser radio emission, variability of hydroxyl masers, spectral observations, fast variability},
  pages = {91--100},
  title = {Search for a fast variability of OH maser emission in sources W3, W49, W51 and W75 for the period 2015 - 2017},
  url = {http://iaaras.ru/en/library/paper/1899/},
  year = {2018}
}

TY  - JOUR
TI  - Search for a fast variability of OH maser emission in sources W3, W49, W51 and W75 for the period 2015 - 2017
AU  - Gosacinskij, I. V.
AU  - Ipatov, A. V.
AU  - Grenkov, S. A.
AU  - Rahimov, I. A.
PY  - 2018
T2  - Transactions of IAA RAS
IS  - 47
SP  - 91
AB  - We report the results of three-year observations of OH masers at 1665
MHz with characteristic times of flux variations from minutes to
hours carried out with the 32-m antenna of Svetloe Radio Astronomical
Observatory. It is discovered in W75 as many as four spectral detales
with radial velocities of -4.5, +0.6, +5.2 and +5.4 km/s in the both
circular polarisatons, emission of wich changed on several tens
percent during lower than hour. In the W51 emission of spectral
detale was found rater stable. In the W49 we have found three
variable detales with radial velocities of +17.1, +18.3 and +18.5
km/s in the right circular polarisation. The most strange were found
the flux variations of two detales in the OH spectrum of W3 with
radial velocities of -47.6 and -45.1 km/s first discovered by us in
2013 − 2014. These variations have almost sinusoidal form with
periods near 24 h and anticorrelated in right and left circular
polarisations. We have showed that such variations can not be any of
instrumental effects, but for now have not any reasonable
explanation.
DO  - 10.32876/ApplAstron.47.91-100
UR  - http://iaaras.ru/en/library/paper/1899/
ER  -