Zobrazeno 1 - 10
of 135
pro vyhledávání: '"A B Pushkarev"'
Autor:
E., Nokhrina E., B, Pushkarev A.
Publikováno v:
2024, MNRAS, 528, 2523-2532
The core shift method is a powerful method to estimate the physical parameters in relativistic jets from active galactic nuclei. The classical approach assumes a conical geometry of a jet and a constant plasma speed. However, recent observations show
Externí odkaz:
http://arxiv.org/abs/2401.06698
Publikováno v:
Galaxies, Vol 11, Iss 4, p 84 (2023)
The advancement of neutrino observatories has sparked a surge in multi-messenger astronomy. Multiple neutrino associations among blazars are reported while neutrino production sites are located within their central (sub)parsecs. Yet, many questions r
Externí odkaz:
https://doaj.org/article/2f4fa67397d9489b9317ebaac615bb9f
Publikováno v:
The Astronomical Journal, Vol 167, Iss 1, p 11 (2023)
We propose the use of entropy, measured from the spatial and flux distribution of pixels in the residual image, as a potential diagnostic and stopping metric for the CLEAN algorithm. Despite its broad success as the standard deconvolution approach in
Externí odkaz:
https://doaj.org/article/ca1f9aa2690b4e81bf37cbe9a1f1345e
Autor:
M. L. Lister, D. C. Homan, K. I. Kellermann, Y. Y. Kovalev, A. B. Pushkarev, E. Ros, T. Savolainen
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 34 (2023)
Externí odkaz:
https://doaj.org/article/726e55888ded4d489bdb827208001e2b
Autor:
D I Zobnina, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, A B Pushkarev, T Savolainen
Publikováno v:
Monthly Notices of the Royal Astronomical Society.
Using stacking of images obtained at different epochs, we studied the variability properties of linear polarization of active galactic nucleus (AGN) jets on parsec-scales. Our sample is drawn from the MOJAVE programme, and consists of 436 AGNs manife
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:1736-1750
We used archival very long baseline interferometry (VLBI) data of active galactic nuclei (AGN) observed from 1.4 GHz to 86 GHz to measure the angular size of VLBI radio cores in 8959 AGNs. We analysed their sky distributions, frequency dependencies a
Autor:
A B Pushkarev, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, T Savolainen, D I Zobnina
We analysed the parsec-scale linear polarization properties of 436 active galactic nuclei (AGN) based on 15 GHz polarimetric Very Long Baseline Array (VLBA) observations. We present polarization and total intensity images averaged over at least five
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7050cf44c8c2172c79fca5fdde3dd754
https://aaltodoc.aalto.fi/handle/123456789/121476
https://aaltodoc.aalto.fi/handle/123456789/121476
Autor:
A. Siemiginowska, Soham Mandal, Yuri Y. Kovalev, Daniel C. Homan, Alexander B. Pushkarev, Matthew L. Lister
Publikováno v:
Astronomische Nachrichten. 342:1117-1120
Publikováno v:
Universe, Vol 6, Iss 11, p 191 (2020)
Light curves for more than century optical photometric observations of the blazar OJ 287 reveals strong flares with a quasi-period of about 12 years. For a long time, this period has been interpreted by processes in a binary black hole system. We pro
Externí odkaz:
https://doaj.org/article/d716beb1794d44a4b7b5525c35ff6678
The magnetic field plays a significant role in the phenomenon of highly collimated jets of active galactic nuclei (AGN). Relativistic effects prevent the direct reconstruction of the magnetic field direction as transverse to electric vectors on radio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7029713f8f74aad756f6f4eeec24f42a
http://arxiv.org/abs/2209.15359
http://arxiv.org/abs/2209.15359