Zobrazeno 1 - 10
of 265
pro vyhledávání: '"Eggen, J."'
Autor:
Angelakis, E., Kiehlmann, S., Myserlis, I., Blinov, D., Eggen, J., Itoh, R., Komossa, S., Marchilli, N., Zensus, J. A.
We have monitored the R-band optical linear polarisation of ten jetted NLSy1 galaxies with the aim to quantify their variability and search for candidate long rotation of the polarisation plane. In all cases for which adequate datasets are available
Externí odkaz:
http://arxiv.org/abs/1807.10485
Autor:
Angelakis, E., Kiehlmann, S., Myserlis, I., Blinov, D., Eggen, J., Itoh, R., Marchili, N., Zensus, J. A.
Publikováno v:
A&A 618, A92 (2018)
Narrow line Seyfert 1 galaxies (NLSy1s) constitute the AGN subclass associated with systematically smaller black hole masses. A few radio loud ones have been detected in MeV -- GeV energy bands by Fermi and evidence for the presence of blazar-like je
Externí odkaz:
http://arxiv.org/abs/1807.02382
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
Autor:
Reed, M. D., Harms, S. L., Poindexter, S., Zhou, A. -Y., Eggen, J. R., Morris, M. A., Quint, A. C., McDaniel, S., Baran, A., Dolez, N., Kawaler, S. D., Kurtz, D. W., Moskalik, P., Riddle, R., Zola, S., Ostensen, R. H., Solheim, J. -E., Kepler, S. O., Costa, A. F. M., Provencal, J. L., Mullally, F., Winget, D. W., Vuckovic, M., Crowe, R., Terry, D., Avila, R., Berkey, B., Stewart, S., Bodnarik, J., Bolton, D., Binder, P. -M., Sekiguchi, K., Sullivan, D. J., Kim, S. -L., Chen, W. -P., Chen, C. -W., Lin, H. -C., Jian, X. -J., Wu, H., Gou, J. -P., Liu, Z., Leibowitz, E., Lipkin, Y., Akan, C., Cakirli, O., Janulis, R., Pretorius, R., Ogloza, W., Stachowski, G., Paparo, M., Szabo, R., Csubry, Z., Zsuffa, D., Silvotti, R., Marinoni, S., Bruni, I., Vauclair, G., Chevreton, M., Matthews, J. M., Cameron, C., Pablo, H.
KPD 1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellipsoidal variable with a known binary period just over two hours. The companion is most likely a white dwarf and the total mass of the system is close to the Chandresak
Externí odkaz:
http://arxiv.org/abs/1011.0387
Autor:
Saesen, S., Pigulski, A., Carrier, F., Michalska, G., Aerts, C., De Ridder, J., Briquet, M., Handler, G., Kolaczkowski, Z., Acke, B., Bauwens, E., Beck, P. G., Blom, Y., Blommaert, J., Broeders, E., Cherix, M., Davignon, G., Debosscher, J., Degroote, P., Decin, L., Dehaes, S., De Meester, W., Deroo, P., Desmet, M., Drummond, R., Eggen, J. R., Fu, J., Gazeas, K., Gelven, G. A., Gielen, C., Huygen, R., Jiang, X., Kalomeni, B., Kim, S. -L., Kim, D. H., Kopacki, G., Kwon, J. -H., Ladjal, D., Lee, C. -U., Lee, Y. -J., Lefever, K., Leitner, A., Lenz, P., Liakos, A., Lorenz, D., Narwid, A., Niarchos, P., Oestensen, R., Poretti, E., Prins, S., Provencal, J., Antolin, E. Puga, Puschnig, J., Raskin, G., Reed, M. D., Reyniers, M., Schmidt, E., Schmitzberger, L., Spano, M., Steininger, B., Steslicki, M., Uytterhoeven, K., Vanautgaerden, J., Vandenbussche, B., Van Helshoecht, V., Vanhollebeke, E., Van Winckel, H., Verhoelst, T., Vuckovic, M., Waelkens, C., Wolf, G. W., Yakut, K., Zhang, C., Zima, W.
Publikováno v:
Astronomische Nachrichten 331, No. 9/10, 1080 - 1083 (2010)
As a result of the variability survey in Chi Persei and NGC6910, the number of Beta Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC6910 and eleven in Chi Persei. We compare pulsational properties, in pa
Externí odkaz:
http://arxiv.org/abs/1004.2853
Autor:
Saesen, S., Carrier, F., Pigulski, A., Aerts, C., Handler, G., Narwid, A., Fu, J. N., Zhang, C., Jiang, X. J., Vanautgaerden, J., Kopacki, G., Stȩślicki, M., Acke, B., Poretti, E., Uytterhoeven, K., Gielen, C., Østensen, R., De Meester, W., Reed, M. D., Kołaczkowski, Z., Michalska, G., Schmidt, E., Yakut, K., Leitner, A., Kalomeni, B., Cherix, M., Spano, M., Prins, S., Van Helshoecht, V., Zima, W., Huygen, R., Vandenbussche, B., Lenz, P., Ladjal, D., Antolín, E. Puga, Verhoelst, T., De Ridder, J., Niarchos, P., Liakos, A., Lorenz, D., Dehaes, S., Reyniers, M., Davignon, G., Kim, S. -L., Kim, D. H., Lee, Y. -J., Lee, C. -U., Kwon, J. -H., Broeders, E., Van Winckel, H., Vanhollebeke, E., Waelkens, C., Raskin, G., Blom, Y., Eggen, J. R., Degroote, P., Beck, P., Puschnig, J., Schmitzberger, L., Gelven, G. A., Steininger, B., Blommaert, J., Drummond, R., Briquet, M., Debosscher, J.
CONTEXT: Recent progress in the seismic interpretation of field beta Cep stars has resulted in improvements of the physics in the stellar structure and evolution models of massive stars. Further asteroseismic constraints can be obtained from studying
Externí odkaz:
http://arxiv.org/abs/1001.1116
Autor:
Provencal, J. L., Montgomery, M. H., Kanaan, A., Shipman, H. L., Childers, D., Baran, A., Kepler, S. O., Reed, M., Zhou, A., Eggen, J., Watson, T. K., Winget, D. E., Thompson, S. E., Riaz, B., Nitta, A., Kleinman, S. J., Crowe, R., Slivkoff, J., Sherard, P., Purves, N., Binder, P., Knight, R., Kim, S. -L., Chen, Wen-Ping, Yang, M., Lin, H. C., Lin, C. C., Chen, C. W., Jiang, X. J., Sergeev, A. V., Mkrtichian, D., Janiashvili, E., Andreev, M., Janulis, R., Siwak, M., Zola, S., Koziel, D., Stachowski, G., Paparo, M., Bognar, Zs., Handler, G., Lorenz, D., Steininger, B., Beck, P., Nagel, T., Kusterer, D., Hoffman, A., Reiff, E., Kowalski, R., Vauclair, G., Charpinet, S., Chevreton, M., Solheim, J. E., Pakstiene, E., Fraga, L., Dalessio, J.
Publikováno v:
Astrophys.J.693:564-585,2009
We report on the analysis of 436.1 hrs of nearly continuous high-speed photometry on the pulsating DB white dwarf GD358 acquired with the Whole Earth Telescope (WET) during the 2006 international observing run, designated XCOV25. The Fourier transfor
Externí odkaz:
http://arxiv.org/abs/0811.0768