2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- A. Zezas3 profiles106 · h 46
- P. Reig2 profiles88 · h 30
- I. Papadakis2 profiles84 · h 43
- V. Charmandaris2 profiles76 · h 70
- V. Pavlidou2 profiles58 · h 50
- C. Soukoulis54 · h 111
- K. Tassis2 profiles52 · h 26
- E. Stratakis47 · h 63
- N. Kylafis2 profiles43 · h 34
- C. Galiotis39 · h 57
- D. Blinov3 profiles33 · h 41
- M. Kafesaki33 · h 54
- University of CreteGR1.1k papers
- California Institute of TechnologyUS231 papers
- Centre National de la Recherche ScientifiqueFR216 papers
- Center for Astrophysics Harvard & SmithsonianUS175 papers
- FORTH Institute of Electronic Structure and LaserGR151 papers
- Max Planck Institute for Radio AstronomyDE139 papers
- Observatoire de ParisFR102 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR94 papers
- Goddard Space Flight CenterUS93 papers
- Max Planck Institute for Extraterrestrial PhysicsDE89 papers
- Aalto UniversityFI84 papers
- Leiden UniversityNL82 papers
28 papers · 2 filters
X-ray spectral-timing variability of 1A 0535+262 during the 2020 giant outburst
P. Reig, R. C. Ma, L. Tao +3
The Be/X-ray binary 1A 0535+262 underwent a giant X-ray outburst in November 2020, peaking at erg s (1--100 keV, 1.8 kpc), the brightest outburst recor…
Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. V. Space and ground millimeter-VLBI imaging of OJ 287
Jose L. Gómez, Efthalia Traianou, Thomas P. Krichbaum +27
We present the first polarimetric space VLBI observations of OJ 287, observed with RadioAstron at 22 GHz during a perigee session on 2014 April 4 and five near-in-time snapshots, t…
Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +208
We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016-2020. Optical, X-ray and GeV flares were detected. The contemporaneous MAGIC obser…
Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search
A. Chalumeau, S. Babak, A. Petiteau +49
The European Pulsar Timing Array (EPTA) collaboration has recently released an extended data set for six pulsars (DR2) and reported evidence for a common red noise signal. Here we…
The Unanticipated Phenomenology of the Blazar PKS~2131021: A Unique Super-Massive Black Hole Binary Candidate
S. O'Neill, S. Kiehlmann, A. C. S. Readhead +24
Most large galaxies host supermassive black holes in their nuclei and are subject to mergers, which can produce a supermassive black hole binary (SMBHB), and hence periodic signatu…
An expanded ultraluminous X-ray source catalogue
M. C. i Bernadich, A. D. Schwope, K. Kovlakas +2
Context. ULXs ( erg s) are excellent probes of accretion physics, star formation and IMBHs searches. As the sample size of X-ray data from modern obser…
Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: Inferences in the stochastic gravitational-wave background search
S. Chen, R. N. Caballero, Y. J. Guo +49
We present results from the search for a stochastic gravitational-wave background (GWB) as predicted by the theory of General Relativity using six radio millisecond pulsars from th…
Constraints on magnetic field and particle content in blazar jets through optical circular polarization
I. Liodakis, D. Blinov, S. B. Potter +1
Polarization offers a unique view in the physical processes of astrophysical jets. We report on optical circular polarization observations of two famous blazars, namely 3C 279 and…
Explodability fluctuations of massive stellar cores enable asymmetric compact object mergers such as GW190814
John Antoniadis, David R. Aguilera-Dena, Alejandro Vigna-Gómez +6
The first three observing runs with Advanced LIGO and Virgo have resulted in the detection of binary black hole mergers (BBH) with highly unequal mass components, which are difficu…
A physical model for the broadband energy spectrum of X-ray illuminated accretion discs: fitting the spectral energy distribution of NGC 5548
M. Dovciak, I. E. Papadakis, E. S. Kammoun +1
We develop a new physical model for the broadband spectral energy distribution (SED) of X-ray illuminated accretion discs, that takes into account the mutual interaction of the acc…
Cyclotron line formation by reflection on the surface of a magnetic neutron star
N. D. Kylafis, J. E. Trümper, N. A. Loudas
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…
Relativistic quantum-mechanical versus classical magnetic resonant scattering cross sections
N. A. Loudas, N. D. Kylafis, J. E. Trümper
Radiative transfer calculations in strong (few G) magnetic fields, observed in X-ray pulsars, require accurate resonant differential scattering cross sections. Suc…
Luminosity dependence of the cyclotron line energy in 1A 0535+262 observed by Insight-HXMT during 2020 giant outburst
L. D. Kong, S. Zhang, L. Ji +11
We report on a detailed spectral analysis of the transient X-ray pulsar 1A~0535+262, which underwent the brightest giant outburst ever recorded for this source from November to Dec…
Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-2
A. Robba, C. Pinto, D. J. Walton +12
It is thought that ultraluminous X-ray sources (ULXs) are mainly powered by super-Eddington accreting neutron stars or black holes as shown by recent discovery of X-ray pulsations…
Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +284
We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with special focus on the multi-band flux co…
Fallback supernova assembly of heavy binary neutron stars and light black hole-neutron star pairs and the common stellar ancestry of GW190425 and GW200115
Alejandro Vigna-Gómez, Sophie L. Schrøder, Enrico Ramirez-Ruiz +4
The detection of the unusually heavy binary neutron star merger GW190425 marked a stark contrast to the mass distribution from known Galactic pulsars in double neutron star binarie…
Repeated pattern of gamma-ray flares in the lightcurve of the blazar 3C 279
D. Blinov, S. G. Jorstad, V. M. Larionov +10
The optical polarization plane of some blazars occasionally exhibits smooth hundred degree long rotations. Multiple theoretical models have been proposed to explain the nature of s…
Exploring black-hole scaling relations via the ensemble variability of Active Galactic Nuclei
A. Georgakakis, I. Papadakis, M. Paolillo
An empirical model is presented that links, for the first time, the demographics of AGN to their ensemble X-ray variability properties. Observations on the incidence of AGN in gala…
The complex variability of blazars: Time-scales and periodicity analysis in S4 0954+65
C. M. Raiteri, M. Villata, V. M. Larionov +3
Among active galactic nuclei, blazars show extreme variability properties. We here investigate the case of the BL Lac object S4 0954+65 with data acquired in 2019-2020 by the Trans…
Revealing Thermal Comptonization of accretion-disk photons in IC4329A with AstroSat
Prakash Tripathi, Gulab Chand Dewangan, I. E. Papadakis +1
We present five simultaneous UV/X-ray observations of IC4329A by AstroSat, performed over {a five-month} period. We utilize the excellent spatial resolution of the Ultra-Violet Ima…
AstroSat/UVIT observations of IC4329A: Constraining the accretion disc inner radius
G. C. Dewangan, P. Tripathi, I. E. Papadakis +1
We present a study of far and near-ultraviolet emission from the accretion disk in a powerful Seyfert 1 galaxy IC4329A using observations performed with the Ultraviolet Imaging Tel…
The Time-Dependent Distribution of Optical Polarization Angle Changes in Blazars
S. Kiehlmann, D. Blinov, I. Liodakis +17
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…
Rapidly-Declining Hostless Type Ia Supernova KSP-OT-201509b from the KMTNet Supernova Program: Transitional Nature and Constraint on Ni Distribution and Progenitor Type
Dae-Sik Moon, Yuan Qi Ni, Maria R. Drout +8
We report the early discovery and multi-color () high-cadence light curve analyses of a rapidly-declining sub-Chandrasekhar Type Ia supernova KSP-OT-201509b (= AT2015cx) from…
The jet collimation profile at high resolution in BL Lacertae
C. Casadio, N. R. MacDonald, B. Boccardi +14
Controversial studies on the jet collimation profile of BL Lacertae (BL Lac), the eponymous blazar of BL Lac objects class, complicate the scenario in this already puzzling class o…