Zobrazeno 1 - 10
of 952
pro vyhledávání: '"Valtonen, M."'
Autor:
Komossa, S., Grupe, D., Kraus, A., Gonzalez, A., Gallo, L. C., Valtonen, M. J., Laine, S., Krichbaum, T. P., Gurwell, M. A., Gomez, J. L., Ciprini, S., Myserlis, I., Bach, U.
We report results from our ongoing project MOMO (Multiwavelength Observations and Modelling of OJ 287). In this latest publication of a sequence, we combine our Swift UVOT--XRT and Effelsberg radio data (2.6-44 GHz) between 2019 and 2022.04 with publ
Externí odkaz:
http://arxiv.org/abs/2204.10244
Autor:
Komossa, S., Grupe, D., Kraus, A., Gallo, L. C., Gonzalez, A., Parker, M. L., Valtonen, M. J., Hollett, A. R., Bach, U., Gómez, J. L., Myserlis, I., Ciprini, S.
Our project MOMO (Multiwavelength observations and modelling of OJ 287) consists of dedicated, dense, long-term flux and spectroscopic monitoring and deep follow-up observations of the blazar OJ 287 at >13 frequencies from the radio to the X-ray band
Externí odkaz:
http://arxiv.org/abs/2107.00083
Autor:
Komossa, S., Grupe, D., Parker, M. L., Gómez, J. L., Valtonen, M. J., Nowak, M. A., Jorstad, S. G., Haggard, D., Chandra, S., Ciprini, S., Dey, L., Gopakumar, A., Hada, K., Markoff, S., Neilsen, J.
We present a comprehensive analysis of all XMM-Newton spectra of OJ 287 spanning 15 years of X-ray spectroscopy of this bright blazar. We also report the latest results from our dedicated Swift UVOT and XRT monitoring of OJ 287 which started in 2015,
Externí odkaz:
http://arxiv.org/abs/2105.01479
Autor:
Komossa, S., Ciprini, S., Dey, L., Gallo, L. C., Gomez, J. L., Gonzalez, A., Grupe, D., Kraus, A., Laine, S. J., Parker, M. L., Valtonen, M. J., Chandra, S., Gopakumar, A., Haggard, D., Nowak, M. A.
Supermassive binary black holes (SMBBHs) are laboratories par excellence for relativistic effects, including precession effects in the Kerr metric and the emission of gravitational waves. Binaries form in the course of galaxy mergers, and are a key c
Externí odkaz:
http://arxiv.org/abs/2104.12901
Autor:
Nilsson, K., Kotilainen, J., Valtonen, M., Gomez, J. L., Castro-Tirado, A. J., Drozdz, M., Gopakumar, A., Jeong, S., Kidger, M., Komossa, S., Mathur, S., Park, I. H., Reichart, D. E., Zola, S.
The BL Lacertae object OJ 287 (z = 0.306) has unique double-peaked optical outbursts every ~12 years, and it presents one of the best cases for a small-separation binary supermassive black hole (SMBH) system, with an extremely massive primary log (M_
Externí odkaz:
http://arxiv.org/abs/2010.05487
We report detection of a very bright X-ray-UV-optical outburst of OJ 287 in April-June 2020; the second brightest since the beginning of our Swift multi-year monitoring in late 2015. It is shown that the outburst is predominantly powered by jet emiss
Externí odkaz:
http://arxiv.org/abs/2008.01826
Autor:
Dey, Lankeswar, Valtonen, M. J., Gopakumar, A., Zola, S., Hudec, R., Pihajoki, P., Ciprini, S., Filippenko, A. V.
Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole central engin
Externí odkaz:
http://arxiv.org/abs/1808.09309
Autor:
Valtonen, M. J., Zola, S., Ciprini, S., Gopakumar, A., Matsumoto, K., Sadakane, K., Kidger, M., Gazeas, K., Nilsson, K., Berdyugin, A., Piirola, V., Jermak, H., Baliyan, K. S., Alicavus, F., Boyd, D., Torrent, M. Campas, Campos, F., Gomez, J. Carrillo, Caton, D. B., Chavushyan, V., Dalessio, J., Debski, B., Dimitrov, D., Drozdz, M., Er, H., Erdem, A., Perez, A. Escartin, Ramazani, V. Fallah, Filippenko, A. V., Ganesh, S., Garcia, F., Pinilla, F. Gomez, Gopinathan, M., Haislip, J. B., Hudec, R., Hurst, G., Ivarsen, K. M., Jelinek, M., Joshi, A., Kagitani, M., Kaur, N., Keel, W. C., LaCluyze, A. P., Lee, B. C., Lindfors, E., de Haro, J. Lozano, Moore, J. P., Mugrauer, M., Nogues, R. Naves, Neely, A. W., Nelson, R. H., Ogloza, W., Okano, S., Pandey, J. C., Perri, M., Pihajoki, P., Poyner, G., Provencal, J., Pursimo, T., Raj, A., Reichart, D. E., Reinthal, R., Sadegi, S., Sakanoi, T., Gonzalez, J. L. Salto, Schweyer, T., Siwak, M., Alfaro, F. C. Soldan, Sonbas, E., Steele, I., Stocke, J. T., Strobl, J., Takalo, L. O., Tomov, T., Espasa, L. Tremosa, Valdes, J. R., Perez, J. Valero, Verrecchia, F., Webb, J. R., Yoneda, M., Zejmo, M., Zheng, W., Telting, J., Saario, J., Reynolds, T., Kvammen, A., Gafton, E., Karjalainen, R., Harmanen, J., Blay, P.
Publikováno v:
ApJ, 819, L37 (2016)
OJ287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts which are predictable in a binary black hole model. The model predicted a major optical outburst in December 2015. We found that the outburst did oc
Externí odkaz:
http://arxiv.org/abs/1603.04171