Zobrazeno 1 - 10
of 962
pro vyhledávání: '"Angelakis, E"'
Autor:
Blinov, D., Maharana, S., Bouzelou, F., Casadio, C., Gjerløw, E., Jormanainen, J., Kiehlmann, S., Kypriotakis, J. A., Liodakis, I., Mandarakas, N., Markopoulioti, L., Panopoulou, G. V., Pelgrims, V., Pouliasi, A., Romanopoulos, S., Skalidis, R., Anche, R. M., Angelakis, E., Antoniadis, J., Medhi, B. J., Hovatta, T., Kus, A., Kylafis, N., Mahabal, A., Myserlis, I., Paleologou, E., Papadakis, I., Pavlidou, V., Papamastorakis, I., Pearson, T. J., Potter, S. B., Ramaprakash, A. N., Readhead, A. C. S., Reig, P., Słowikowska, A., Tassis, K., Zensus, J. A.
Publikováno v:
A&A 677, A144 (2023)
Optical polarimeters are typically calibrated using measurements of stars with known and stable polarization parameters. However, there is a lack of such stars available across the sky. Many of the currently available standards are not suitable for m
Externí odkaz:
http://arxiv.org/abs/2307.06151
Autor:
Kiehlmann, S., Blinov, D., Liodakis, I., Pavlidou, V., Readhead, A. C. S., Angelakis, E., Casadio, C., Hovatta, T., Kylafis, N., Mahabal, A., Mandarakas, N., Myserlis, I., Panopoulou, G. V., Pearson, T. J., Ramaprakash, A., Reig, P., Skalidis, R., Slowikowska, A., Tassis, K., Zensus, J. A.
At optical wavelengths, blazar Electric Vector Position Angle (EVPA) rotations linked with gamma-ray activity have been the subject of intense interest and systematic investigation for over a decade. One difficulty in the interpretation of EVPA rotat
Externí odkaz:
http://arxiv.org/abs/2104.02622
Autor:
Blinov, D., Kiehlmann, S., Pavlidou, V., Panopoulou, G. V., Skalidis, R., Angelakis, E., Casadio, C., Einoder, E. N., Hovatta, T., Kokolakis, K., Kougentakis, A., Kus, A., Kylafis, N., Kyritsis, E., Lalakos, A., Liodakis, I., Maharana, S., Makrydopoulou, E., Mandarakas, N., Maragkakis, G. M., Myserlis, I., Papadakis, I., Paterakis, G., Pearson, T. J., Ramaprakash, A. N., Readhead, A. C. S., Reig, P., Słowikowska, A., Tassis, K., Xexakis, K., Żejmo, M., Zensus, J. A.
We present uniformly reprocessed and re-calibrated data from the RoboPol programme of optopolarimetric monitoring of active galactic nuclei (AGN), covering observations between 2013, when the instrument was commissioned, and 2017. In total, the datas
Externí odkaz:
http://arxiv.org/abs/2012.00008
Publikováno v:
A&A 635, A102 (2020)
A number of works reported on the existence of a large scale alignment of the polarization plane of extragalactic sources as well as the alignment of radio-sources structural axes. However, both claims and their interpretation remain controversial. F
Externí odkaz:
http://arxiv.org/abs/2002.00982
Autor:
Foschini, L., Lister, M. L., Hovatta, T., Kovalev, Y. Y., Romano, P., Vercellone, S., Lähteenmäki, A., Savolainen, T. K., Tornikoski, M., Angelakis, E., Berton, M., Braito, V., Ciroi, S., Kadler, M., Burd, P. R.
There are several methods to calculate the radiative and kinetic power of relativistic jets, but their results can differ by one or two orders of magnitude. Therefore, it is necessary to perform a calibration of the jet power, to understand the reaso
Externí odkaz:
http://arxiv.org/abs/1911.07457
Autor:
Fromm, C. M., Younsi, Z., Bazcko, A., Mizuno, Y., Porth, O., Perucho, M., Olivares, H., Nathanail, A., Angelakis, E., Ros, E., Zensus, J. A., Rezzolla, L.
Publikováno v:
A&A 629, A4 (2019)
High-resolution Very-Long-Baseline Interferometry observations of NGC 1052 show a two sided jet with several regions of enhanced emission and a clear emission gap between the two jets.This gap shrinks with increasing frequency and vanishes around $\n
Externí odkaz:
http://arxiv.org/abs/1904.00106
Autor:
Rani, B., Zhang, H., Hunter, S. D., Kislat, F., Böttcher, M., McEnery, J. E., Thompson, D. J., Giannios, D., Guo, F., Li, H., Baring, M., Agudo, I., Buson, S., Petropoulou, M., Pavlidou, V., Angelakis, E., Myserlis, I., Wadiasingh, Z., da Silva, R. M. Curado, Kilian, P., Guiriec, S., Bozhilov, V. V., Hodgson, J., Antón, S., Kazanas, D., Coppi, P., Venters, T., Longo, F., Bottacini, E., Ojha, R., Zhang, B., Ciprini, S., Moiseev, A., Shrader, C.
The constantly improving sensitivity of ground-based and space-borne observatories has made possible the detection of high-energy emission (X-rays and gamma-rays) from several thousands of extragalactic sources. Enormous progress has been made in mea
Externí odkaz:
http://arxiv.org/abs/1903.04607
Autor:
Ramaprakash, A. N., Rajarshi, C. V., Das, H. K., Khodade, P., Modi, D., Panopoulou, G., Maharana, S., Blinov, D., Angelakis, E., Casadio, C., Fuhrmann, L., Hovatta, T., Kiehlmann, S., King, O. G., Kylafis, N., Kougentakis, A., Kus, A., Mahabal, A., Marecki, A., Myserlis, I., Paterakis, G., Paleologou, E., Liodakis, I., Papadakis, I., Papamastorakis, I., Pavlidou, V., Pazderski, E., Pearson, T. J., Readhead, A. C. S., Reig, P., Slowikowska, A., Tassis, K., Zensus, J. A.
We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters $q$ and $u$ (and the total intensity $
Externí odkaz:
http://arxiv.org/abs/1902.08367
Autor:
Angelakis, E., Fuhrmann, L., Myserlis, I., Zensus, J. A., Nestoras, I., Karamanavis, V., Marchili, N., Krichbaum, T. P., Kraus, A., Rachen, J. P.
The advent of the Fermi-GST with its unprecedented capability to monitor the entire 4 pi sky within less than 2-3 hours, introduced new standard in time domain gamma-ray astronomy. To explore this new avenue of extragalactic physics the F-GAMMA progr
Externí odkaz:
http://arxiv.org/abs/1902.04404
Autor:
Mandarakas, N., Blinov, D., Liodakis, I., Kouroumpatzakis, K., Zezas, A., Panopoulou, G. V., Myserlis, I., Angelakis, E., Hovatta, T., Kiehlmann, S., Kokolakis, K., Paleologou, E., Pouliasi, A., Skalidis, R., Pavlidou, V.
Publikováno v:
A&A 623, A61 (2019)
The third Fermi-LAT catalog (3FGL) presented the data of the first four years of observations from the Fermi Gamma-ray Space Telescope mission. There are 3034 sources, 1010 of which still remain unidentified. Identifying and classifying gamma-ray emi
Externí odkaz:
http://arxiv.org/abs/1810.06312