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## VLBI Network «Quasar»: VLBI Observations of Maser Sources

Transactions of IAA RAS, issue 28, 3–10 (2014)

Keywords: W3OH, W49. very long baseline interferometry, masers, spectral line observations, Orion KL, W3OH, W49

### Abstract

Quasar VLBI network is a part of the global VLBI network which investigates cosmic radio sources in the Eastern hemisphere. Quasar is equipped with standard receivers working on 3.5 cm and 13 cm wavelengths. Also, it has additional low noise receivers in 1.35 cm, 6 cm, and 18 cm wavelength ranges. Regular VLBI observations have been started on 6 cm and 18 cm wavelengths on agendas of several international programs. This article presents first results of maser source structure investigations in hydroxyl lines (W3OH) and water vapour lines (Orion KL and W49), including polarized emission. The structure of a 25-mas large bipolar flow is determined in the Orion KL source. Active zones are identified and matched in both polarizations of the W3OH gas-and-dust system.

### Citation

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A. V. Ipatov, L. I. Matveenko, V. A. Demichev, A. E. Melnikov, A. G. Mikhailov, E. Y. Khvostov. VLBI Network «Quasar»: VLBI Observations of Maser Sources // Transactions of IAA RAS. — 2014. — Issue 28. — P. 3–10. @article{ipatov2014, abstract = {Quasar VLBI network is a part of the global VLBI network which investigates cosmic radio sources in the Eastern hemisphere. Quasar is equipped with standard receivers working on 3.5 cm and 13 cm wavelengths. Also, it has additional low noise receivers in 1.35 cm, 6 cm, and 18 cm wavelength ranges. Regular VLBI observations have been started on 6 cm and 18 cm wavelengths on agendas of several international programs. This article presents first results of maser source structure investigations in hydroxyl lines (W3OH) and water vapour lines (Orion KL and W49), including polarized emission. The structure of a 25-mas large bipolar flow is determined in the Orion KL source. Active zones are identified and matched in both polarizations of the W3OH gas-and-dust system.}, author = {A.~V. Ipatov and L.~I. Matveenko and V.~A. Demichev and A.~E. Melnikov and A.~G. Mikhailov and E.~Y. Khvostov}, issue = {28}, journal = {Transactions of IAA RAS}, keyword = {W3OH, W49. very long baseline interferometry, masers, spectral line observations, Orion KL, W3OH, W49}, pages = {3--10}, title = {VLBI Network «Quasar»: VLBI Observations of Maser Sources}, url = {http://iaaras.ru/en/library/paper/1006/}, year = {2014} } TY - JOUR TI - VLBI Network «Quasar»: VLBI Observations of Maser Sources AU - Ipatov, A. V. AU - Matveenko, L. I. AU - Demichev, V. A. AU - Melnikov, A. E. AU - Mikhailov, A. G. AU - Khvostov, E. Y. PY - 2014 T2 - Transactions of IAA RAS IS - 28 SP - 3 AB - Quasar VLBI network is a part of the global VLBI network which investigates cosmic radio sources in the Eastern hemisphere. Quasar is equipped with standard receivers working on 3.5 cm and 13 cm wavelengths. Also, it has additional low noise receivers in 1.35 cm, 6 cm, and 18 cm wavelength ranges. Regular VLBI observations have been started on 6 cm and 18 cm wavelengths on agendas of several international programs. This article presents first results of maser source structure investigations in hydroxyl lines (W3OH) and water vapour lines (Orion KL and W49), including polarized emission. The structure of a 25-mas large bipolar flow is determined in the Orion KL source. Active zones are identified and matched in both polarizations of the W3OH gas-and-dust system. UR - http://iaaras.ru/en/library/paper/1006/ ER -