Suchergebnisse

H2O maser emission associated with the massive star formation region W49N were observed with the Space-VLBI mission RadioAstron. The procedure for processing of the maser spectral line data obtained in the RadioAstron observations is described. Ultra-fine spatial structures in the maser emission were detected on space-ground baselines of up to 9.6 Earth diameters. The correlated flux densities of these features range from 0.1% to 0.6% of the total flux density. These low values of correlated flux density are probably due to turbulence either in the maser itself or in the interstellar medium. © 2019 COSPAR ; The RadioAstron project is led by the Astro Space Center of the Lebedev Physical Institute of the Russian Academy of Sciences and the Lavochkin Scientific and Production Association under a contract with the State Space Corporation ROSCOSMOS, in collaboration with partner organizations in Russia and other countries. This work is based on observations carried out using the 100-meter radio telescope of the MPIfR (Max-Planck-Institute for Radio Astronomy) at Effelsberg, 100-meter R.C. Byrd Green Bank Telescope of the Green Bank Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc., 26-meter radio telescope operated by Hartebeesthoek Radio Astronomy Observatory in Johannesburg, Republic of South Africa, 32-meter telescope in Medicina operated by INAF - Istituto di Radioastronomia and 32-meter radio telescope operated by Toruń Centre for Astronomy of Nicolaus Copernicus University in Toruń (Poland) and supported by the Polish Ministry of Science and Higher Education SpUB grant. NNS acknowledges support from Russian Science Foundation grant 18-12-00193. AMS work was supported by the Ministry of Education and Science (the basic part of the State assignment, RK No. AAAA-A17-117030310283-7) and by the Act No. 211 of the Government of the Russian Federation, agreement 02.A03.21.0006.