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Start Over Author "Wiita, P. J." Journal monthly notices of the royal astronomical society
15 results on '"Wiita, P. J."'

3. Optical Variability of TeV Blazars on long time-scales

Author

Gaur, Haritma, primary, Gupta, Alok C, additional, Bachev, R, additional, Strigachev, A, additional, Semkov, E, additional, Wiita, P J, additional, Kurtanidze, O M, additional, Darriba, A, additional, Damljanovic, G, additional, Chanishvili, R G, additional, Ibryamov, S, additional, Kurtanidze, S O, additional, Nikolashvili, M G, additional, Sigua, L A, additional, and Vince, O, additional

Published
2019
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4. Multiband optical variability of the blazar OJ 287 during its outbursts in 2015–2016

Author

Gupta, Alok C., primary, Agarwal, Aditi, additional, Mishra, Alka, additional, Gaur, H., additional, Wiita, P. J., additional, Gu, M. F., additional, Kurtanidze, O. M., additional, Damljanovic, G., additional, Uemura, M., additional, Semkov, E., additional, Strigachev, A., additional, Bachev, R., additional, Vince, O., additional, Zhang, Z., additional, Villarroel, B., additional, Kushwaha, P., additional, Pandey, A., additional, Abe, T., additional, Chanishvili, R., additional, Chigladze, R. A., additional, Fan, J. H., additional, Hirochi, J., additional, Itoh, R., additional, Kanda, Y., additional, Kawabata, M., additional, Kimeridze, G. N., additional, Kurtanidze, S. O., additional, Latev, G., additional, Dimitrova, R. V. Muñoz, additional, Nakaoka, T., additional, Nikolashvili, M. G., additional, Shiki, K., additional, Sigua, L. A., additional, and Spassov, B., additional

Published
2016
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5. Nature of intranight optical variability of BL Lacertae

Author

Gaur, Haritma, primary, Gupta, Alok C., additional, Bachev, R., additional, Strigachev, A., additional, Semkov, E., additional, Böttcher, M., additional, Wiita, P. J., additional, de Diego, J. A., additional, Gu, M. F., additional, Guo, H., additional, Joshi, R., additional, Mihov, B., additional, Palma, N., additional, Peneva, S., additional, Rajasingam, A., additional, and Slavcheva-Mihova, L., additional

Published
2015
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6. Multiband optical variability of the blazar OJ 287 during its outbursts in 2015-2016.

Author

Gupta, Alok C., Agarwal, Aditi, Mishra, Alka, Gaur, H., Wiita, P. J., Gu, M. F., Kurtanidze, O. M., Damljanovic, G., Uemura, M., Semkov, E., Strigachev, A., Bachev, R., Vince, O., Zhang, Z., Villarroel, B., Kushwaha, P., Pandey, A., Abe, T., Chanishvili, R., and Chigladze, R. A.

Subjects
BL Lacertae objects, OPTICAL telescopes, ASTRONOMICAL photometry, BINARY black holes, EMISSION spectroscopy
Abstract

We present recent optical photometric observations of the blazar OJ 287 taken during 2015 September-2016 May. Our intense observations of the blazar started in 2015 November and continued until 2016 May and included detection of the large optical outburst in 2015 December that was predicted using the binary black hole model for OJ 287. For our observing campaign, we used a total of nine ground-based optical telescopes of which one is in Japan, one is in India, three are in Bulgaria, one is in Serbia, one is in Georgia, and two are in the USA. These observations were carried out in 102 nights with a total of ~1000 image frames in BVRI bands, though the majority were in the R band. We detected a second comparably strong flare in 2016 March. In addition, we investigated multiband flux variations, colour variations, and spectral changes in the blazar on diverse time-scales as they are useful in understanding the emission mechanisms. We briefly discuss the possible physical mechanisms most likely responsible for the observed flux, colour, and spectral variability. [ABSTRACT FROM AUTHOR]

Published
2017
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8. Multiwavelength intraday variability of the BL Lacertae S5 0716+714

Author

Gupta, Alok C., primary, Krichbaum, T. P., additional, Wiita, P. J., additional, Rani, B., additional, Sokolovsky, K. V., additional, Mohan, P., additional, Mangalam, A., additional, Marchili, N., additional, Fuhrmann, L., additional, Agudo, I., additional, Bach, U., additional, Bachev, R., additional, Böttcher, M., additional, Gabanyi, K. E., additional, Gaur, H., additional, Hawkins, K., additional, Kimeridze, G. N., additional, Kurtanidze, O. M., additional, Kurtanidze, S. O., additional, Lee, C.-U., additional, Liu, X., additional, McBreen, B., additional, Nesci, R., additional, Nestoras, G., additional, Nikolashvili, M. G., additional, Ohlert, J. M., additional, Palma, N., additional, Peneva, S., additional, Pursimo, T., additional, Semkov, E., additional, Strigachev, A., additional, Webb, J. R., additional, Wiesemeyer, H., additional, and Zensus, J. A., additional

Published
2012
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