Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Rene Hudec"'
Autor:
Mauri J. Valtonen, Staszek Zola, Alok C. Gupta, Shubham Kishore, Achamveedu Gopakumar, Svetlana G. Jorstad, Paul J. Wiita, Minfeng Gu, Kari Nilsson, Alan P. Marscher, Zhongli Zhang, Rene Hudec, Katsura Matsumoto, Marek Drozdz, Waldemar Ogloza, Andrei V. Berdyugin, Daniel E. Reichart, Markus Mugrauer, Lankeswar Dey, Tapio Pursimo, Harry J. Lehto, Stefano Ciprini, T. Nakaoka, M. Uemura, Ryo Imazawa, Michal Zejmo, Vladimir V. Kouprianov, James W. Davidson Jr., Alberto Sadun, Jan Štrobl, Z. R. Weaver, Martin Jelínek
Publikováno v:
The Astrophysical Journal Letters, Vol 968, Iss 2, p L17 (2024)
We report the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ 287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifre
Externí odkaz:
https://doaj.org/article/e6e575b905e5482a8bee0479a0634bbd
Autor:
Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar, Staszek Zola, Anne Lähteenmäki, Merja Tornikoski, Alok C. Gupta, Tapio Pursimo, Emil Knudstrup, Jose L. Gomez, Rene Hudec, Martin Jelínek, Jan Štrobl, Andrei V. Berdyugin, Stefano Ciprini, Daniel E. Reichart, Vladimir V. Kouprianov, Katsura Matsumoto, Marek Drozdz, Markus Mugrauer, Alberto Sadun, Michal Zejmo, Aimo Sillanpää, Harry J. Lehto, Kari Nilsson, Ryo Imazawa, Makoto Uemura
Publikováno v:
Galaxies, Vol 11, Iss 4, p 82 (2023)
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary model because the major axis of the precessing binary happens to lie almos
Externí odkaz:
https://doaj.org/article/f417436aeaf440128c5aa7366d0a29a7
Publikováno v:
Sensors, Vol 23, Iss 6, p 3362 (2023)
The Timepix3 is a hybrid pixellated radiation detector consisting of a 256 px × 256 px radiation-sensitive matrix. Research has shown that it is susceptible to energy spectrum distortion due to temperature variations. This can lead to a relative mea
Externí odkaz:
https://doaj.org/article/aad0fcbac4694c6ea344a57e08a22a1e
Publikováno v:
Sensors, Vol 23, Iss 4, p 2201 (2023)
The Timepix3 readout ASIC chip is a hybrid pixelated radiation detector, designed at CERN, which contains a 256 px × 256 px matrix. Each of the 65,536 radiation-sensitive pixels can record an incoming particle, its energy deposition or time of arriv
Externí odkaz:
https://doaj.org/article/3c265a392ba34b28b17ed55fa511b799
Autor:
Carlos Granja, Rene Hudec, Veronika Maršíková, Adolf Inneman, Ladislav Pína, Daniela Doubravova, Zdenek Matej, Vladimir Daniel, Peter Oberta
Publikováno v:
Universe, Vol 8, Iss 4, p 241 (2022)
We present a miniaturized and wide field-of-view X-ray and Gamma-ray imager consisting of a segmented 2D optics-collimator coupled to the high-sensitivity semiconductor pixel detector Timepix equipped with a high-Z sensor (CdTe 2000 μm thick). The c
Externí odkaz:
https://doaj.org/article/5fc59956db014c92926ce83ed9dbb270
Publikováno v:
Universe, Vol 8, Iss 3, p 144 (2022)
This paper presents microsatellite spacecraft payload study for prompt observation of transient astrophysical objects in X-ray energy range. By combining telescope concepts and miniaturized detectors, the small spacecraft will be able to probe the X-
Externí odkaz:
https://doaj.org/article/dd10d38e1f594260a830d5b97ad869a4
Autor:
Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar, Staszek Zola, S. Komossa, Tapio Pursimo, Jose L. Gomez, Rene Hudec, Helen Jermak, Andrei V. Berdyugin
Publikováno v:
Galaxies, Vol 10, Iss 1, p 1 (2021)
Successful observations of the seven predicted bremsstrahlung flares from the unique bright blazar OJ 287 firmly point to the presence of a nanohertz gravitational wave (GW) emitting supermassive black hole (SMBH) binary central engine. We present ar
Externí odkaz:
https://doaj.org/article/af5f9125ad2e4889900303ec9331f2d6
Autor:
Lankeswar Dey, Achamveedu Gopakumar, Mauri Valtonen, Stanislaw Zola, Abhimanyu Susobhanan, Rene Hudec, Pauli Pihajoki, Tapio Pursimo, Andrei Berdyugin, Vilppu Piirola, Stefano Ciprini, Kari Nilsson, Helen Jermak, Mark Kidger, Stefanie Komossa
Publikováno v:
Universe, Vol 5, Iss 5, p 108 (2019)
The bright blazar OJ 287 is the best-known candidate for hosting a nanohertz gravitational wave (GW) emitting supermassive binary black hole (SMBBH) in the present observable universe. The binary black hole (BBH) central engine model, proposed by Leh
Externí odkaz:
https://doaj.org/article/cf3b78a65f76450f94cb44835dffc74d
Autor:
Mauri Valtonen, Stanislaw Zola, Helen Jermak, Stefano Ciprini, Rene Hudec, Lankeswar Dey, Achamveedu Gopakumar, Daniel L. Reichart, Daniel B. Caton, Kosmas Gazeas, Katsura Matsumoto, Waldemar Ogloza, Marek Drozdz, Fahri Alicavus, Oleksandr Baransky, Andrei Berdyugin, Panos Boumis, Yurii Bufan, Bartlomiej Debski, Huseyin Er, Ahmet Erdem, Vira Godunova, Shirin Haque, Vivian L. Hoette, Jan Janik, Mark Kidger, Tomasz Kundera, Sebastian Kurowski, Alexis Liakos, Isa Mohammed, Kari Nilsson, Urszula Pajdosz, Vilppu Piirola, Tapio Pursimo, Brandon Rajkumar, Andrii O. Simon, Michal Siwak, Eda Sonbas, Ian A. Steele, Volodymir V. Vasylenko, Michal Zejmo, Pawel Zielinski
Publikováno v:
Galaxies, Vol 5, Iss 4, p 83 (2017)
We report optical photometric and polarimetric observations of the blazar OJ 287 gathered during 2016/17. The high level of activity, noticed after the General Relativity Centenary flare, is argued to be part of the follow-up flares that exhibited hi
Externí odkaz:
https://doaj.org/article/f62e823262d04e028ac9e84bfa1052d2
Publikováno v:
Advances in Astronomy, Vol 2010 (2010)
The paper deals with the description of a new concept for a spherical mechanism for agile telescopes. It is based on redundantly actuated parallel kinematical structure. Due to the three times overactuated structure and application of several further
Externí odkaz:
https://doaj.org/article/65e56199ce9345208b0fb83d776ec095