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Wyszukujesz frazę "Webb, S. A." wg kryterium: Wszystkie pola


Tytuł:
Discovery of a highly polarized optical microflare in blazar S 5 0716+714 during the 2014 WEBT campaign
Autorzy:
Ui, T.
Yoshida, M.
Strigachev, A.
Markowitz, A.
Moody, J. W.
Troitsky, I. S.
Klimanov, S. A.
Laurence, D.
Sadun, A. C.
Sasada, M.
Carosati, D.
Jabłeka, Damian
Raiteri, C. M.
Villata, M.
Stawarz, Łukasz
Bhatta, Gopal
Kawabata, K. S.
Ohlert, J. M.
Itoh, R.
Arkharov, A. A.
Jorstad, S.
Ostrowski, Michał
Kurtanidze, O.
Rizzi, N.
Paola, A. Di
Marscher, A. P.
Damljanovic, G.
Frasca, A.
Goyal, Arti
Dhalla, S.
Akitaya, H.
Larionov, V. M.
Webb, J. R.
Takaki, K.
Hiriart, D.
Moritani, Y.
Borman, G. A.
Hu, S.-M.
Benítez, E.
Leto, G.
Zoła, Stanisław
Sergeev, S.
Cason, A. D.
Bachev, R.
Vince, O.
Opis:
The occurrence of low-amplitude flux variations in blazars on hourly timescales, commonly known as microvariability, is still a widely debated subject in high-energy astrophysics. Several competing scenarios have been proposed to explain such occurrences, including various jet plasma instabilities leading to the formation of shocks, magnetic reconnection sites, and turbulence. In this Letter, we present the results of our detailed investigation of a prominent, five-hour-long optical microflare detected during the recent WEBT campaign on 2014 March 2–6 targeting the blazar 0716+714. After separating the flaring component from the underlying base emission continuum of the blazar, we find that the microflare is highly polarized, with the polarization degree $\sim$(40-60)\%$\pm$ (2-10)\% and the electric vector position angle $\sim(10-20)^{\circ}\pm (1-8)^{\circ}$ slightly misaligned with respect to the position angle of the radio jet. The microflare evolution in the ( Q , U ) Stokes parameter space exhibits a looping behavior with a counterclockwise rotation, meaning the polarization degree decreases with the flux (but is higher in the flux decaying phase), and an approximately stable polarization angle. The overall very high polarization degree of the flare, its symmetric flux rise and decay profiles, and also its structured evolution in the Q–U plane all imply that the observed flux variation corresponds to a single emission region characterized by a highly ordered magnetic field. As discussed in the paper, a small-scale but strong shock propagating within the outflow, and compressing a disordered magnetic field component, provides a natural, though not unique, interpretation of our findings.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Authenticating the presence of a relativistic massive black hole binary in OJ 287 using its general relativity centenary flare : improved orbital parameters
Autorzy:
Ogloza, W.
Gopinathan, M.
Boyd, D.
Harmanen, J.
Gómez Pinilla, F.
Ciprini, S.
Carrillo Gómez, J.
Dey, Lankeswar
Kidger, M.
Jermak, H.
Baransky, A.
Garcia, F.
Mugrauer, M.
Soldán Alfaro, F. C.
Chavushyan, V.
Tomov, T.
Kvammen, A.
Caton, D. B.
Mikkola, S.
Filippenko, A. V.
Verrecchia, F.
Escartin Pérez, A.
Valdes, J. R.
Janík, J.
Hudec, R.
Nilsson, K.
Zoła, Stanisław
Gafton, E.
Reichart, D. E.
Salto González, J.-L.
Chandra, S.
Naves Nogues, R.
Gopakumar, A.
Pursimo, T.
Provencal, J.
Joshi, A.
Yoneda, M.
Campos, F.
Reinthal, R.
Fallah Ramazani, V.
Vasylenko, V.
Sillanpää, A.
Baliyan, K. S.
Zielinski, P.
Kagitani, M.
Sameer, Sameer
Sadegi, S.
Lehto, H. J.
Webb, J. R.
Er, H.
Gazeas, K.
Perri, M.
Karjalainen, R.
Zheng, W.
Pihajoki, P.
Boumis, P.
Liakos, A.
Sakanoi, T.
Schweyer, T.
Dalessio, J.
Campas Torrent, M.
Hurst, G.
Piirola, V.
Neely, A. W.
Raj, A.
Blay, P.
Reynolds, T.
Zejmo, M.
Stocke, J. T.
Nelson, R. H.
Matsumoto, K.
Kurowski, Sebastian
Lozano de Haro, J.
Alicavus, F.
Siwak, Michał
Saario, J.
Ganesh, S.
Kundera, Tomasz
Tremosa Espasa, L.
Dębski, Bartłomiej
Drozdz, M.
Strobl, J.
Steele, I.
Takalo, L. O.
Valero Pérez, J.
Simon, A.
Poyner, G.
Sadakane, K.
Erdem, A.
Jelinek, M.
Sonbas, E.
Kaur, N.
Okano, S.
LaCluyze, A. P.
Kouprianov, V. V.
Lindfors, E.
Pajdosz-Śmierciak, Urszula
Berdyugin, A.
Godunova, V.
Haislip, J. B.
Pandey, J. C.
Keel, W. C.
Lee, B. C.
Valtonen, M. J.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Primary black hole spin in OJ 287 as determined by the general relativity centenary flare
Autorzy:
Reichart, D. E.
Chavushyan, V.
Tomov, T.
Berdyugin, A.
Schweyer, T.
Naves Nogues, R.
Campos, F.
Poyner, G.
Lindfors, E.
Kidger, M.
Perri, M.
Joshi, A.
Jermak, H.
Neely, A. W.
Sonbas, E.
Er, H.
Tremosa Espasa, L.
Ogloza, W.
Keel, W. C.
Haislip, J. B.
Mugrauer, M.
Raj, A.
Filippenko, A. V.
Reinthal, R.
Soldán Alfaro, F. C.
Nelson, R. H.
Valero Pérez, J.
Okano, S.
Campas Torrent, M.
Saario, J.
Blay, P.
Zheng, W.
Valdes, J. R.
Provencal, J.
Harmanen, J.
Salto González, J.-L.
Erdem, A.
Matsumoto, K.
Piirola, V.
Gopinathan, M.
Strobl, J.
Pandey, J. C.
Valtonen, M. J.
Alicavus, F.
Caton, D. B.
Moore, J. P.
Carrillo Gómez, J.
Escartin Pérez, A.
Dębski, Bartłomiej
Ciprini, S.
Sameer
Kaur, N.
Reynolds, T.
Baliyan, K. S.
Verrecchia, F.
Zejmo, M.
Gazeas, K.
Hudec, R.
Drozdz, M.
Sakanoi, T.
Dalessio, J.
Dimitrov, D.
Hurst, G.
Gafton, E.
Sadakane, K.
Lozano de Haro, J.
Ivarsen, K. M.
Nilsson, K.
Garcia, F.
Steele, I.
Karjalainen, R.
Yoneda, M.
Takalo, L. O.
Sadegi, S.
Siwak, Michał
Gómez Pinilla, F.
Gopakumar, A.
Fallah Ramazani, V.
Kvammen, A.
Ganesh, S.
Jelinek, M.
Webb, J. R.
Pihajoki, P.
Boyd, D.
Lee, B. C.
Stocke, J. T.
LaCluyze, A. P.
Pursimo, T.
Zoła, Stanisław
Kagitani, M.
Telting, J.
Opis:
OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in a binary black hole model. The model predicted a major optical outburst in 2015 December. We found that the outburst did occur within the expected time range, peaking on 2015 December 5 at magnitude 12.9 in the optical R-band. Based on Swift/XRT satellite measurements and optical polarization data, we find that it included a major thermal component. Its timing provides an accurate estimate for the spin of the primary black hole, x=0.313 $\pm$ 0.01. The present outburst also confirms the established general relativistic properties of the system such as the loss of orbital energy to gravitational radiation at the 2% accuracy level, and it opens up the possibility of testing the black hole no-hair theorem with 10% accuracy during the present decade.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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