Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Nikolaos D. Kylafis"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 496:4366-4371
The fast variability observed in the X-ray emission from black hole binaries has a very complex phenomenology, but offers the possibility to investigate directly the properties of the inner accretion flow. In particular, type-B oscillations in the 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64f1562baff5d093f3491c3b0939f9a5
https://doi.org/10.1093/mnras/staa1843
https://doi.org/10.1093/mnras/staa1843
Autor:
Talvikki Hovatta, Pablo Reig, N. Mandarakas, Konstantinos Tassis, Georgia Panopoulou, C. Casadio, Vasiliki Pavlidou, T. J. Pearson, Nikolaos D. Kylafis, D. Blinov, Ioannis Liodakis, Anamparambu N. Ramaprakash, J. A. Zensus, Ioannis Myserlis, Agnieszka Slowikowska, A. C. S. Readhead, R. Skalidis, S. Kiehlmann, E. Angelakis, A. A. Mahabal
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1923a074bce16826edd54772b874c2e
https://aaltodoc.aalto.fi/handle/123456789/110200
https://aaltodoc.aalto.fi/handle/123456789/110200
Autor:
Siddharth Maharana, P. Khodade, Ioannis Myserlis, Agnieszka Slowikowska, E. Paleologou, Andrzej Marecki, T. J. Pearson, Talvikki Hovatta, G. Paterakis, Lars Fuhrmann, A. C. S. Readhead, A. A. Mahabal, Vasiliki Pavlidou, Emmanouil Angelakis, Pablo Reig, Georgia Panopoulou, Carolina Casadio, C. Rajarshi, D. Modi, Anamparambu N. Ramaprakash, Andrzej Kus, Ioannis Liodakis, O. G. King, I. E. Papadakis, I. Papamastorakis, Konstantinos Tassis, Hillol Das, E. Pazderski, J. A. Zensus, D. Blinov, Sebastian Kiehlmann, A. Kougentakis, Nikolaos D. Kylafis
Publikováno v:
Monthly Notices of the Royal Astronomical Society
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4243f9ff86c1edc035d5b70233b86d15
https://doi.org/10.1093/mnras/stz557
https://doi.org/10.1093/mnras/stz557
Autor:
Konstantinos Tassis, Talvikki Hovatta, G. Paterakis, A. Lalakos, George Miltos Maragkakis, R. Skalidis, Ioannis Liodakis, A. C. S. Readhead, K. Kokolakis, E. Makrydopoulou, E. Kyritsis, Vasiliki Pavlidou, K. Xexakis, A. Kougentakis, Dmitry A. Blinov, I. E. Papadakis, Agnieszka Slowikowska, Nikolaos D. Kylafis, T. J. Pearson, Siddharth Maharana, Michał Żejmo, E. N. Einoder, N. Mandarakas, Andrzej Kus, Sebastian Kiehlmann, Ioannis Myserlis, Pablo Reig, Carolina Casadio, Georgia Panopoulou, E. Angelakis, Anamparambu N. Ramaprakash, J. A. Zensus
Publikováno v:
Monthly Notices of the Royal Astronomical Society
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f14b8b71bded890b5709ffdb3294884a
Autor:
Konstantinos Tassis, E. Pazderski, Siddharth Maharana, A. A. Mahabal, T. J. Pearson, Ioannis Myserlis, O. G. King, Mislav Baloković, A. C. S. Readhead, Emmanouil Angelakis, I. E. Papadakis, Talvikki Hovatta, Vasiliki Pavlidou, Ioannis Liodakis, E. Paleologou, Sebastian Kiehlmann, Pablo Reig, Nikolaos D. Kylafis, Anamparambu N. Ramaprakash, Georgia Panopoulou, Andrzej Kus, Dmitry A. Blinov, I. Papamastorakis, J. A. Zensus
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 474:1296-1306
We use results of our 3 year polarimetric monitoring program to investigate the previously suggested connection between rotations of the polarization plane in the optical emission of blazars and their gamma-ray flares in the GeV band. The homogeneous
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d776346628a43e0c915691a401b8dd7b
https://doi.org/10.1093/mnras/stx2786
https://doi.org/10.1093/mnras/stx2786
Publikováno v:
Astronomy & Astrophysics. 655:A38
Context. Radiative transfer calculations in strong (few ×1012 G) magnetic fields, which are observed in X-ray pulsars, require accurate differential cross-sections of resonant scattering. While such cross-sections exist, their application is cumbers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::364f233b01edb7394885ea3b726e4acc
https://doi.org/10.1051/0004-6361/202039268
https://doi.org/10.1051/0004-6361/202039268
Publikováno v:
Astronomy & Astrophysics. 655:A39
Context. Accretion onto magnetic neutron stars results in X-ray spectra that often exhibit a cyclotron resonance scattering feature (CRSF) and, sometimes, higher harmonics of it. Two places are suspect for the formation of a CRSF: the surface of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1bc8077790d8f9ecdb207d88323cf26
https://doi.org/10.1051/0004-6361/202039361
https://doi.org/10.1051/0004-6361/202039361
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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We have performed a timing and spectral analysis of a set of black hole binaries to study the correlation between the photon index and the time lag of the hard photons with respect to the soft ones. We provide further evidence that the timing and spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e8e3f6633507f7417ccda1e22e78d48
https://doi.org/10.1093/mnras/stx2683
https://doi.org/10.1093/mnras/stx2683
Autor:
Nikolaos D. Kylafis, Pablo Reig
Recently, we reported an observational correlation between a) the time-lag of the hard (9 - 15 keV) with respect to the soft (2 - 5 keV) X-ray photons in black-hole X-ray binaries (BHXRBs) and b) the power-law photon index $\Gamma$ of the X-ray spect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcdd9f526649865efef084f4de1a4427
Autor:
Pablo Reig, Nikolaos D. Kylafis
Publikováno v:
Astronomy & Astrophysics. 646:A112
The models that seek to explain the reflection spectrum in black hole binaries usually invoke a point-like primary source of hard X-rays. This source illuminates the accretion disk and gives rise to the discrete (lines) and continuum-reflected compon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8c5865614dc83304534153369c05581
https://doi.org/10.1051/0004-6361/202039903
https://doi.org/10.1051/0004-6361/202039903