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3. Processing of Complex Profile Parts by Waterjet Cutting

Author

Doroshenko, K. O., Maximov, Yu. V., Avdeev, V. B., Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Radionov, Andrey A., editor, and Gasiyarov, Vadim R., editor

Published
2023
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4. Detection statistics of the RadioAstron AGN survey

Author

Kovalev, Y. Y., Kardashev, N. S., Sokolovsky, K. V., Voitsik, P. A., An, T., Anderson, J. M., Andrianov, A. S., Avdeev, V. Yu., Bartel, N., Bignall, H. E., Burgin, M. S., Edwards, P. G., Ellingsen, S. P., Frey, S., Garcia-Miro, C., Gawronski, M. P., Ghigo, F. D., Ghosh, T., Giovannini, G., Girin, I. A., Giroletti, M., Gurvits, L. I., Jauncey, D. L., Horiuchi, S., Ivanov, D. V., Kharinov, M. A., Koay, J. Y., Kostenko, V. I., Kovalenko, A. V., Kovalev, Yu. A., Kravchenko, E. V., Kunert-Bajraszewska, M., Kutkin, A. M., Likhachev, S. F., Lisakov, M. M., Litovchenko, I. D., McCallum, J. N., Melis, A., Melnikov, A. E., Migoni, C., Nair, D. G., Pashchenko, I. N., Phillips, C. J., Polatidis, A., Pushkarev, A. B., Quick, J. F. H., Rakhimov, I. A., Reynolds, C., Rizzo, J. R., Rudnitskiy, A. G., Savolainen, T., Shakhvorostova, N. N., Shatskaya, M. V., Shen, Z. -Q., Shchurov, M. A., Vermeulen, R. C., de Vicente, P., Wolak, P., Zensus, J. A., and Zuga, V. A.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The largest Key Science Program of the RadioAstron space VLBI mission is a survey of active galactic nuclei (AGN). The main goal of the survey is to measure and study the brightness of AGN cores in order to better understand the physics of their emission while taking interstellar scattering into consideration. In this paper we present detection statistics for observations on ground-space baselines of a complete sample of radio-strong AGN at the wavelengths of 18, 6, and 1.3 cm. Two-thirds of them are indeed detected by RadioAstron and are found to contain extremely compact, tens to hundreds of $\mu$as structures within their cores., Comment: Accepted to the Advances in Space Research special issue "High-resolution Space-Borne Radio Astronomy"

Published
2019
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5. RadioAstron probes the ultra-fine spatial structure in the H$_2$O maser emission in the star forming region W49N

Author

Shakhvorostova, N. N., Sobolev, A. M., Moran, J. M., Alakoz, A. V., Imai, H., and Avdeev, V. Y.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

H$_2$O 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., Comment: Accepted for publication in Advances in Space Research

Published
2019
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8. RadioAstron orbit determination and evaluation of its results using correlation of space-VLBI observations

Author

Zakhvatkin, M. V., Andrianov, A. S., Avdeev, V. Yu., Kostenko, V. I., Kovalev, Y. Y., Likhachev, S. F., Litovchenko, I. D., Litvinov, D. A., Rudnitskiy, A. G., Shchurov, M. A., Sokolovsky, K. V., Stepanyants, V. A., Tuchin, A. G., Voitsik, P. A., Zaslavskiy, G. S., Zharov, V. E., and Zuga, V. A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

A crucial part of a space mission for very-long baseline interferometery (VLBI), which is the technique capable of providing the highest resolution images in astronomy, is orbit determination of the mission's space radio telescope(s). In order to successfully detect interference fringes that result from correlation of the signals recorded by a ground-based and a space-borne radio telescope, the propagation delays experienced in the near-Earth space by radio waves emitted by the source and the relativity effects on each telescope's clock need to be evaluated, which requires accurate knowledge of position and velocity of the space radio telescope. In this paper we describe our approach to orbit determination (OD) of the RadioAstron spacecraft of the RadioAstron space-VLBI mission. Determining RadioAstron's orbit is complicated due to several factors: strong solar radiation pressure, a highly eccentric orbit, and frequent orbit perturbations caused by the attitude control system. We show that in order to maintain the OD accuracy required for processing space-VLBI observations at cm-wavelengths it is required to take into account the additional data on thruster firings, reaction wheel rotation rates, and attitude of the spacecraft. We also investigate into using the unique orbit data available only for a space-VLBI spacecraft, i.e. the residual delays and delay rates that result from VLBI data processing, as a means to evaluate the achieved OD accuracy. We present the results of the first experience of OD accuracy evaluation of this kind, using more than 5,000 residual values obtained as a result of space-VLBI observations performed over 7 years of the RadioAstron mission operations., Comment: 13 pages, 10 figures, the paper has been accepted for publication in Advances in Space Research

Published
2018
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16. Structure and Kinematics of the Interstellar Medium in the Star-Forming Region in the BCD Galaxy VIIZw403 (UGC6456)

Author

Lozinskaya, T. A., Moiseev, A. V., Avdeev, V. Yu., and Egorov, O. V.

Subjects
Astrophysics
Abstract

The structure and kinematics of ionized gas in the star-forming region in the BCD galaxy VIIZw403 (UGC6456) are analyzed using observations with the SCORPIO focal reducer on the 6-m Special Astrophysical Observatory telescope in three modes: direct imaging (in the H-alpha, [OIII], and [SII] lines), long-slit spectroscopy, and spectroscopy with a scanning Fabry-Perot interferometer. In addition to the previously known bright HII regions and the faint giant ring that surrounds the entire star-forming region, many new faint diffuse and arc structures have been detected. Fine structure of the giant ring has been revealed. We do not confirm the previously detected expansion of the bright shells around young stellar associations with a velocity of 50-70 km/s. We have estimated their expansion velocities to be no higher than 15-20 km/s; the corresponding kinematic age, no younger than 3-4 Myr, agrees well with the age of the compact OB associations related to them. We associate the faint extended filamentary and diffuse regions of ionized gas identified in nearly the entire central region of the galaxy and the giant HII ring with the older (10 Myr) stellar population of the most recent starburst. Weak high-velocity [OIII] and H-alpha line wings (up to 300 km/s from the line center) have been detected in the brightest HII region. Such velocities have been observed in the galaxy for the first time. The previously published H-alpha luminosity measurements for the galaxy are refined., Comment: to appear in Astronomy Letters, 13 pages, 6 postscript figures, 1 in colour

Published
2006
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33. “RadioAstron”-A telescope with a size of 300 000 km: Main parameters and first observational results

Author

Kardashev, N. S., Khartov, V. V., Abramov, V. V., Avdeev, V. Yu., Alakoz, A. V., Aleksandrov, Yu. A., Ananthakrishnan, S., Andreyanov, V. V., Andrianov, A. S., Antonov, N. M., Artyukhov, M. I., Arkhipov, M. Yu., Baan, W., Babakin, N. G., Babyshkin, V. E., Bartel’, N., Belousov, K. G., Belyaev, A. A., Berulis, J. J., Burke, B. F., Biryukov, A. V., Bubnov, A. E., Burgin, M. S., Busca, G., Bykadorov, A. A., Bychkova, V. S., Vasil’kov, V. I., Wellington, K. J., Vinogradov, I. S., Wietfeldt, R., Voitsik, P. A., Gvamichava, A. S., Girin, I. A., Gurvits, L. I., Dagkesamanskii, R. D., D’Addario, L., Giovannini, G., Jauncey, D. L., Dewdney, P. E., D’yakov, A. A., Zharov, V. E., Zhuravlev, V. I., Zaslavskii, G. S., Zakhvatkin, M. V., Zinov’ev, A. N., Ilinen, Yu., Ipatov, A. V., Kanevskii, B. Z., Knorin, I. A., Casse, J. L., Kellermann, K. I., Kovalev, Yu. A., Kovalev, Yu. Yu., Kovalenko, A. V., Kogan, B. L., Komaev, R. V., Konovalenko, A. A., Kopelyanskii, G. D., Korneev, Yu. A., Kostenko, V. I., Kotik, A. N., Kreisman, B. B., Kukushkin, A. Yu., Kulishenko, V. F., Cooper, D. N., Kut’kin, A. M., Cannon, W. H., Larionov, M. G., Lisakov, M. M., Litvinenko, L. N., Likhachev, S. F., Likhacheva, L. N., Lobanov, A. P., Logvinenko, S. V., Langston, G., McCracken, K., Medvedev, S. Yu., Melekhin, M. V., Menderov, A. V., Murphy, D. W., Mizyakina, T. A., Mozgovoi, Yu. V., Nikolaev, N. Ya., Novikov, B. S., Novikov, I. D., Oreshko, V. V., Pavlenko, Yu. K., Pashchenko, I. N., Ponomarev, Yu. N., Popov, M. V., Pravin-Kumar, A., Preston, R. A., Pyshnov, V. N., Rakhimov, I. A., Rozhkov, V. M., Romney, J. D., Rocha, P., Rudakov, V. A., Räisänen, A., Sazankov, S. V., Sakharov, B. A., Semenov, S. K., Serebrennikov, V. A., Schilizzi, R. T., Skulachev, D. P., Slysh, V. I., Smirnov, A. I., Smith, J. G., Soglasnov, V. A., Sokolovskii, K. V., Sondaar, L. H., Stepan’yants, V. A., Turygin, M. S., Turygin, S. Yu., Tuchin, A. G., Urpo, S., Fedorchuk, S. D., Finkel’shtein, A. M., Fomalont, E. B., Fejes, I., Fomina, A. N., Khapin, Yu. B., Tsarevskii, G. S., Zensus, J. A., Chuprikov, A. A., Shatskaya, M. V., Shapirovskaya, N. Ya., Sheikhet, A. I., Shirshakov, A. E., Schmidt, A., Shnyreva, L. A., Shpilevskii, V. V., Ekers, R. D., and Yakimov, V. E.

Published
2013
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