Zobrazeno 1 - 10
of 200
pro vyhledávání: '"Kylafis, N"'
Autor:
Kylafis, N., Reig, P.
Publikováno v:
A&A 690, A6 (2024)
The hot inner flow in black-hole X-ray binaries is not just a static corona rotating around the black hole, but it must be partially outflowing. We have developed a model, in which Comptonization takes place in this outflowing corona. We are able to
Externí odkaz:
http://arxiv.org/abs/2407.05729
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
Publikováno v:
A&A 662, A118 (2022)
Black-hole X-ray binaries (BHXRBs) in the hard and hard-intermediate spectral (and temporal) states exhibit in their power spectra characteristic frequencies called type-C quasi-periodic oscillations (QPOs). Various models that can explain them with
Externí odkaz:
http://arxiv.org/abs/2204.14139
Publikováno v:
A&A 655, A38 (2021)
Radiative transfer calculations in strong (few $\times 10^{12}$ G) magnetic fields, observed in X-ray pulsars, require accurate resonant differential scattering cross sections. Such cross sections exist, but they are quite cumbersome. Here we compare
Externí odkaz:
http://arxiv.org/abs/2108.07568
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 neutron s
Externí odkaz:
http://arxiv.org/abs/2108.07573
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:
Reig, P., Kylafis, N. D.
Publikováno v:
A&A 646, A112 (2021)
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:
http://arxiv.org/abs/2101.02437
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
Autor:
Kylafis, N., Reig, P.
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:
http://arxiv.org/abs/1911.11975
Autor:
Reig, P., Kylafis, N.
Publikováno v:
A&A 625, A90 (2019)
Galactic black-hole X-ray binaries (BHBs) emit a compact, optically thick, mildly relativistic radio jet when they are in the hard and hard-intermediate states. In these states, BHBs exhibit a correlation between the time lag of hard photons with res
Externí odkaz:
http://arxiv.org/abs/1904.02950