Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Voitsik, P. A."'
Autor:
Cho, Ilje, Gómez, José L., Lico, Rocco, Zhao, Guang-Yao, Traianou, Efthalia, Dahale, Rohan, Fuentes, Antonio, Toscano, Teresa, Foschi, Marianna, Kovalev, Yuri Y., Lobanov, Andrei, Pushkarev, Alexander B., Gurvits, Leonid I., Kim, Jae-Young, Lisakov, Mikhail, Voitsik, Petr, Myserlis, Ioannis, Pötzl, Felix, Ros, Eduardo
Publikováno v:
A&A 2024, 683, A248
We present total intensity and linear polarization images of OJ287 at 1.68GHz, obtained through space-based VLBI observations with RadioAstron on April 16, 2016. The observations were conducted using a ground array consisting of the VLBA and the EVN.
Externí odkaz:
http://arxiv.org/abs/2312.08643
Autor:
Kim, Jae-Young, Savolainen, Tuomas, Voitsik, Petr, Kravchenko, Evgeniya V., Lisakov, Mikhail M., Kovalev, Yuri Y., Müller, Hendrik, Lobanov, Andrei P., Sokolovsky, Kirill V., Bruni, Gabriele, Edwards, Philip G., Reynolds, Cormac, Bach, Uwe, Gurvits, Leonid I., Krichbaum, Thomas P., Hada, Kazuhiro, Giroletti, Marcello, Orienti, Monica, Anderson, James M., Lee, Sang-Sung, Sohn, Bong Won, Zensus, J. Anton
Publikováno v:
ApJ 952 (2023) 34
We present results from the first 22 GHz space very-long-baseline interferometric (VLBI) imaging observations of M87 by RadioAstron. As a part of the Nearby AGN Key Science Program, the source was observed in Feb 2014 at 22 GHz with 21 ground station
Externí odkaz:
http://arxiv.org/abs/2304.09816
Autor:
Gómez, Jose L., Traianou, Efthalia, Krichbaum, Thomas P., Lobanov, Andrei, Fuentes, Antonio, Lico, Rocco, Zhao, Guang-Yao, Bruni, Gabriele, Kovalev, Yuri Y., Lahteenmaki, Anne, Voitsik, Petr A., Lisakov, Mikhail M., Angelakis, Emmanouil, Bach, Uwe, Casadio, Carolina, Cho, Ilje, Dey, Lankeswar, Gopakumar, Achamveedu, Gurvits, Leonid, Jorstad, Svetlana G., Kovalev, Yuri A., Lister, Matthew L., Marscher, Alan P., Myserlis, Ioannis, Pushkarev, Alexander, Ros, Eduardo, Savolainen, Tuomas, Tornikoski, Merja, Valtonen, Mauri J., Zensus, Anton
Publikováno v:
ApJ 924 (2022) 122
We present the first polarimetric space VLBI observations of OJ 287, observed with RadioAstron at 22 GHz during a perigee session on 2014 April 4 and five near-in-time snapshots, together with contemporaneous ground VLBI observations at 15, 43, and 8
Externí odkaz:
http://arxiv.org/abs/2111.11200
Autor:
Johnson, Michael D., Kovalev, Yuri Y., Lisakov, Mikhail M., Voitsik, Petr A., Gwinn, Carl R., Bruni, Gabriele
Publikováno v:
ApJ 922 (2021) L28
We report results from the first Earth-space VLBI observations of the Galactic Center supermassive black hole, Sgr A*. These observations used the space telescope Spektr-R of the RadioAstron project together with a global network of 20 ground telesco
Externí odkaz:
http://arxiv.org/abs/2111.06423
Autor:
Savolainen, T., Giovannini, G., Kovalev, Y. Y., Perucho, M., Anderson, J. M., Bruni, G., Edwards, P. G., Fuentes, A., Giroletti, M., Gómez, J. L., Hada, K., Lee, S. S., Lisakov, M. M., Lobanov, A. P., López-Miralles, J., Orienti, M., Petrov, L., Plavin, A. V., Sohn, B. W., Sokolovsky, K. V., Voitsik, P. A., Zensus, J. A.
Publikováno v:
A&A 676, A114 (2023)
We present RadioAstron space-based very long baseline interferometry (VLBI) observations of the nearby radio galaxy 3C84 (NGC1275) at the centre of the Perseus cluster. The observations were carried out on September 21-22, 2013 and involved a global
Externí odkaz:
http://arxiv.org/abs/2111.04481
Autor:
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., Zuga, V. A.
Publikováno v:
Advances in Space Research 65 (2020) 705-711
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 emis
Externí odkaz:
http://arxiv.org/abs/1909.00785
Autor:
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., Zuga, V. A.
Publikováno v:
Advances in Space Research 65 (2020) 798-812
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 suc
Externí odkaz:
http://arxiv.org/abs/1812.01623
Autor:
Voitsik, P. A., Pushkarev, A. B., Kovalev, Y. Y., Plavin, A. V., Lobanov, A. P., Ipatov, A. V.
Publikováno v:
Astron. Rep. (2018) 62: 787
Results of a pilot project with the participation of the "Kvazar-KVO" radio interferometry array in observations carried out with the European VLBI Network are presented. The aim of the project was to conduct and analyze multi-frequency (1.7, 2.3, 5.
Externí odkaz:
http://arxiv.org/abs/1809.10011
Autor:
Giovannini, G., Savolainen, T., Orienti, M., Nakamura, M., Nagai, H., Kino, M., Giroletti, M., Hada, K., Bruni, G., Kovalev, Y. Y., Anderson, J. M., D'Ammando, F., Hodgson, J., Honma, M., Krichbaum, T. P., Lee, S. -S., Lico, R., Lisakov, M. M., Lobanov, A. P., Petrov, L., Sohn, B. W., Sokolovsky, K. V., Voitsik, P. A., Zensus, J. A., Tingay, S.
Understanding the launching, acceleration, and collimation of jets powered by active galactic nuclei remains an outstanding problem in relativistic astrophysics. This is partly because observational tests of jet formation models suffer from the limit
Externí odkaz:
http://arxiv.org/abs/1804.02198
Autor:
Pilipenko, S. V., Kovalev, Y. Y., Andrianov, A. S., Bach, U., Buttaccio, S., Cassaro, P., Cimò, G., Edwards, P. G., Gawroński, M. P., Gurvits, L. I., Hovatta, T., Jauncey, D. L., Johnson, M. D., Kovalev, Yu. A., Kutkin, A. M., Lisakov, M. M., Melnikov, A. E., Orlati, A., Rudnitskiy, A. G., Sokolovsky, K. V., Stanghellini, C., de Vicente, P., Voitsik, P. A., Wolak, P., Zhekanis, G. V.
Publikováno v:
MNRAS 474 (2018) 3523
The high brightness temperatures, $T_\mathrm{b}\gtrsim 10^{13}$ K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measur
Externí odkaz:
http://arxiv.org/abs/1711.06713