Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Miller, H. R. P."'
We report the discovery of gamma-ray emission from two radio-loud narrow-line Seyfert 1 galaxies using data from Fermi/LAT: J0804+3853 (z = 0.211) and J1443+4725 (z = 0.502). The objects were discovered due to singular, separate, and brief brightenin
Externí odkaz:
http://arxiv.org/abs/1404.5355
The results of monitoring the optical polarization and the gamma-ray flux for the radio-loud narrow-line Seyfert 1 galaxy is reported. We have detected a weak correlation between the gamma-ray variability and the optical variability. However, these o
Externí odkaz:
http://arxiv.org/abs/1304.1786
Autor:
Donnarumma, I., De Rosa, A., Vittorini, V., Miller, H. R., Popovic, L. C., Simic, S., Tavani, M., Eggen, J., Maune, J., Kuulkers, E., Striani, E., Vercellone, S., Pucella, G., Verrecchia, F., Pittori, C., Giommi, P., Pacciani, L., Barbiellini, G., Bulgarelli, A., Cattaneo, P. W., Chen, A. W., Costa, E., Del Monte, E., Evangelista, Y., Feroci, M., Fuschino, F., Gianotti, F., Giuliani, A., Giusti, M., Lazzarotto, F., Longo, F., Lucarelli, F., Pellizzoni, A., Piano, G., Soffitta, P., Trifoglio, M., Trois, A.
Publikováno v:
Astrophys.J.Lett.736:l30,2011
We report the extraordinary gamma-ray activity (E>100 MeV) of the gravitationally lensed blazar PKS 1830-211 (z=2.507) detected by AGILE between October and November 2010. The source experienced on October 14 a flux increase of a factor of ~ 12 with
Externí odkaz:
http://arxiv.org/abs/1106.4224
AGN, such as blazars, are most often observed during flare states, primarily due to ease of detection. We report microvariability observations of one blazar, however, while in a historically low state. Comparisons of the amplitude of the variability
Externí odkaz:
http://arxiv.org/abs/1104.3887
Akademický článek
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Autor:
Chatterjee, R., Jorstad, S. G., Marscher, A. P., Oh, H., McHardy, I. M., Aller, M. F., Aller, H. D., Balonek, T. J., Miller, H. R., Ryle, W. T., Tosti, G., Kurtanidze, O., Nikolashvili, M., Larionov, V. M., Hagen-Thorn, V. A.
We present the results of extensive multi-waveband monitoring of the blazar 3C~279 between 1996 and 2007 at X-ray energies (2-10 keV), optical R band, and 14.5 GHz, as well as imaging with the Very Long Baseline Array (VLBA) at 43 GHz. In all bands t
Externí odkaz:
http://arxiv.org/abs/0808.2194
Using the Rossi X-ray Timing Experiment (RXTE), we have observed both the Seyfert 1 galaxy Akn 120 and the broad-line radio galaxy 3C 120. Monitoring observations spanning 2 years plus intensive stares spanning several days have been obtained for bot
Externí odkaz:
http://arxiv.org/abs/astro-ph/0312422
Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands
Autor:
Hartman, R. C., Villata, M., Balonek, T. J., Bertsch, D. L., Bock, H., Boettcher, M., Carini, M. T., Collmar, W., De Francesco, G., Ferrara, E. C., Heidt, J., Kanbach, G., Katajainen, S., Koskimies, M., Kurtanidze, O. M., Lanteri, L., Lawson, A., Lin, Y. C., Marscher, A. P., McFarland, J. P., McHardy, I. M., Miller, H. R., Nikolashvili, M., Nilsson, K., Noble, J. C., Nucciarelli, G., Ostorero, L., Pursimo, T., Raiteri, C. M., Rekola, R., Savolainen, T., Sillanpaa, A., Smale, A., Sobrito, G., Takalo, L. O., Thompson, D. J., Tosti, G., Wagner, S. J., Wilson, J. W.
Light curves of 3C 279 are presented in optical (R-band), X-rays (RXTE/PCA), and gamma rays (CGRO/EGRET) for 1999 Jan-Feb and 2000 Jan-Mar. During both of those epochs the gamma-ray levels were high, and all three observed bands demonstrated substant
Externí odkaz:
http://arxiv.org/abs/astro-ph/0105247
Publikováno v:
New Astron.Rev. 44 (2000) 539-541
We present the first results of a search for the presence of rapid optical variability in a sample of five Narrow-Line Seyfert 1 galaxies. We find clear evidence of rapid variability for IRAS 13224-3809 with variations occurring on time scales of an
Externí odkaz:
http://arxiv.org/abs/astro-ph/0005155
Autor:
Giommi, P., Massaro, E., Chiappetti, L., Ferrara, E. C., Ghisellini, G., Jang, Minhwan, Maesano, M., Miller, H. R., Montagni, F., Nesci, R., Padovani, P., Perlman, E., Raiteri, C. M., Sclavi, S., Tagliaferri, G., Tosti, G., Villata, M.
We report intensity variations of different spectral components in the BL Lac object S5 0716+714 detected during coordinated BeppoSAX and optical observations in 1996 and 1998. The transition between synchrotron and inverse Compton emission has been
Externí odkaz:
http://arxiv.org/abs/astro-ph/9909241