Zobrazeno 1 - 10
of 321
pro vyhledávání: '"Gu, M. F."'
Autor:
Yuan, Q., Kushwaha, Pankaj, Gupta, Alok C., Tripathi, Ashutosh, Wiita, Paul J., Zhang, M., Liu, X., Lahteenmaki, Anne, Tornikoski, Merja, Tammi, Joni, Ramakrishnan, Venkatessh, Cui, L., Wang, X., Gu, M. F., Bambi, Cosimo, Volvach, A. E.
We perform correlation and periodicity search analyses on long-term multi-band light curves of the FSRQ 1510-089 observed by the space-based Fermi--Large Area Telescope in gamma-rays, the SMARTS and Steward Observatory telescopes in optical and near-
Externí odkaz:
http://arxiv.org/abs/2306.10248
Autor:
Kushwaha, Pankaj, Gupta, Alok C., Wiita, Paul J., Pal, Main, Gaur, Haritma, Pino, E. M. de Gouveia Dal, Kurtanidze, O. M., Semkov, E., Damljanovic, G., Hu, S. M., Uemura, M., Vince, O., Darriba, A., Gu, M. F., Bachev, R., Chen, Xu, Itoh, R., Kawabata, M., Kurtanidze, S. O., Nakaoka, T., Nikolashvili, M. G., Sigua, L. A., Strigachev, A., Zhang, Z.
Publikováno v:
MNRAS, 479, 1672 - 1684 (2018)
We present a multi-wavelength spectral and temporal investigation of OJ 287 emission during its strong optical-to-X-ray activity between July 2016 - July 2017. The daily $\gamma$-ray fluxes from \emph{Fermi}-LAT are consistent with no variability. Th
Externí odkaz:
http://arxiv.org/abs/1803.10213
Autor:
Gupta, Alok C., Gaur, Haritma, Wiita, Paul J., Pandey, A., Kushwaha, P., Hu, S. M., Kurtanidze, O. M., Semkov, E., Damljanovic, G., Goyal, A., Uemura, M., Darriba, A., Chen, Xu, Vince, O., Gu, M. F., Zhang, Z., Bachev, R., Chanishvili, R., Itoh, R., Kawabata, M., Kurtanidze, S. O., Nakaoka, T., Nikolashvili, M. G., Stawarz, L., Strigachev, A.
Publikováno v:
2019, AJ, 157, 95
We report on a recent multi-band optical photometric and polarimetric observational campaign of the blazar OJ 287 which was carried out during September 2016 -- December 2017. We employed nine telescopes in Bulgaria, China, Georgia, Japan, Serbia, Sp
Externí odkaz:
http://arxiv.org/abs/1803.03964
Autor:
Gaur, Haritma, Gupta, Alok C., Bachev, R., Strigachev, A., Semkov, E., Wiita, Paul J., Gu, M. F., Ibryamov, S.
Publikováno v:
2017, Galaxies, 5, 94
We monitored BL Lacertae frequently during 2014 - 2016 when it was generally in a high state. We searched for intra-day variability for 43 nights using quasi-simultaneous measurements in the B, V, R, and I bands (totaling 143 light curves); the typic
Externí odkaz:
http://arxiv.org/abs/1712.02515
Autor:
Gaur, Haritma, Chen, Liang, Misra, R., Sahayanathan, S., Gu, M. F., Kushwaha, P., Dewangan, G. C.
The synchrotron peak of the X-ray bright High Energy Peaked Blazar (HBL) PKS 2155$-$304 occurs in the UV-EUV region and hence its X-ray emission (0.6--10 keV) lies mostly in the falling part of the synchrotron hump. We aim to study the X-ray emission
Externí odkaz:
http://arxiv.org/abs/1710.08098
Autor:
Gupta, Alok C., Mangalam, Arun, Wiita, Paul J., Kushwaha, P., Gaur, H., Zhang, H., Gu, M. F., Liao, M., Dewangan, G., Ho, L. C., Mohan, P., Umeura, M., Sasada, M., Volvach, A. E., Agarwal, A., Aller, M. F., Aller, H. D., Bachev, R., Lahteenmaki, A., Semkov, E., Strigachev, A., Tornikoski, M., Volvach, L. N.
Publikováno v:
MNRAS 472, 788 - 798 (2017)
The blazar 3C454.3 exhibited a strong flare seen in gamma-rays, X-rays, and optical/NIR bands during 3--12 December 2009. Emission in the V and J bands rose more gradually than did the gamma-rays and soft X-rays, though all peaked at nearly the same
Externí odkaz:
http://arxiv.org/abs/1708.03504
Autor:
Asada, K., Kino, M., Honma, M., Hirota, T., Lu, R. -S., Inoue, M., Sohn, B. -W., Shen, Z. -Q., Ho, P. T. P., Akiyama, K., Algaba, J-C., An, T., Bower, G., Byun, D-Y., Dodson, R., Doi, A., Edwards, P. G., Fujisawa, K., Gu, M-F., Hada, K., Hagiwara, Y., Jaroenjittichai, P., Jung, T., Kawashima, T., Koyama, S., Lee, S-S., Matsushita, S., Nagai, H., Nakamura, M., Niinuma, K., Phillips, C., Park, J-H., Pu, H-Y., Ro, H-W., Stevens, J., Trippe, S., Wajima, K., Zhao, G-Y.
This White Paper details the intentions and plans of the East Asian Very Long Baseline Interferometry (VLBI) community for pushing the frontiers of millimeter/submillimeter VLBI. To this end, we shall endeavor to actively promote coordinated efforts
Externí odkaz:
http://arxiv.org/abs/1705.04776
Autor:
Agarwal, A., Mohan, P., Gupta, Alok C., Mangalam, A., Volvach, A. E., Aller, M. F., Aller, H. D., Gu, M. F., Lahteenmaki, A., Tornikoski, M., Volvach, L. N.
We studied the pc-scale core shift effect using radio light curves for three blazars, S5 0716+714, 3C 279 and BL Lacertae, which were monitored at five frequencies ($\nu$) between 4.8 GHz and 36.8 GHz using the University of Michigan Radio Astronomic
Externí odkaz:
http://arxiv.org/abs/1704.03229
Autor:
Gupta, Alok C., Agarwal, A., Mishra, A., 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., Chigladze, R. A., Fan, J. H., Hirochi, J., Itoh, R., Kanda, Y., Kawabata, M., Kimeridze, G. N., Kurtanidze, S. O., Latev, G., Dimitrova, R. V. Muñoz, Nakaoka, T., Nikolashvili, M. G., Shiki, K., Sigua, L. A., Spassov, B.
Publikováno v:
MNRAS 465, 4423 (2017)
We present recent optical photometric observations of the blazar OJ 287 taken during September 2015 -- May 2016. Our intense observations of the blazar started in November 2015 and continued until May 2016 and included detection of the large optical
Externí odkaz:
http://arxiv.org/abs/1611.07561
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