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
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- V. Charmandaris2 profiles76 · h 70
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- University of CreteGR1.1k papers
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- Max Planck Institute for Extraterrestrial PhysicsDE89 papers
- Aalto UniversityFI84 papers
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125 papers · 1 filter
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…
Non-ideal MHD simulations of subcritical prestellar cores with non-equilibrium chemistry
Aris Tritsis, Christoph Federrath, Karen Willacy +1
Non-ideal magnetohydrodynamic (MHD) effects are thought to be gravity's closest ally in overcoming the support of magnetic fields and in forming stars. Here, we modify the publicly…
Thermalization of light's orbital angular momentum in nonlinear multimode waveguide systems
Fan O. Wu, Qi Zhong, Huizhong Ren +3
We show that the orbital angular momentum (OAM) of a light field can be thermalized in a nonlinear cylindrical multimode optical waveguide. We find, that upon thermal equilibrium,…
Comparison of hydrostatic and lensing cluster mass estimates:a pilot study in MACS J0647.7+7015
A. Ferragamo, J. F. Macías-Pérez, V. Pelgrims +6
The detailed characterization of scaling laws relating the observables of cluster of galaxies to their mass is crucial for obtaining accurate cosmological constraints with clusters…
Identification of Twitter Bots Based on an Explainable Machine Learning Framework: The US 2020 Elections Case Study
Alexander Shevtsov, Christos Tzagkarakis, Despoina Antonakaki +1
Twitter is one of the most popular social networks attracting millions of users, while a considerable proportion of online discourse is captured. It provides a simple usage framewo…
Experimental demonstration of ultrathin broken-symmetry metasurfaces with controllably sharp resonant response
Odysseas Tsilipakos, Luca Maiolo, Francesco Maita +5
Symmetry-protected resonances can be made to couple with free space by introducing a small degree of geometric asymmetry, leading to controllably-sharp spectral response. Here, we…
Stripped-Envelope Stars in Different Metallicity Environments I. Evolutionary Phases, Classification and Populations
David R. Aguilera-Dena, Norbert Langer, John Antoniadis +5
Massive stars that become stripped of their hydrogen envelope through binary interaction or winds can be observed either as Wolf-Rayet stars, if they have optically thick winds, or…
Dynamo effect in unstirred self-gravitating turbulence
Axel Brandenburg, Evangelia Ntormousi
In many astrophysical environments, self-gravity can generate kinetic energy, which, in principle, is available for driving dynamo action. Using direct numerical simulations, we sh…
Chirality sensing employing PT-symmetric and other resonant gain-loss optical systems
Ioannis Katsantonis, Sotiris Droulias, Costas M. Soukoulis +3
Molecular chirality detection and enantiomer discrimination are very important issues for many areas of science and technology, prompting intensive investigations via optical metho…
Transforming space with non-Hermitian dielectrics
Ivor Krešić, Konstantinos G. Makris, Ulf Leonhardt +1
Coordinate transformations are a versatile tool to mould the flow of light, enabling a host of astonishing phenomena such as optical cloaking with metamaterials. Moving away from t…
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…
Topological photonic Su-Schrieffer-Heeger-type coupler
Nikolaos K. Efremidis
We examine the coupling process between the surface modes of a Su-Schrieffer-Heeger lattice both in the linear and the nonlinear regimes. We first develop a coupled-mode theory for…
What defines a compact symmetric object? A carefully vetted sample of CSOs
Anthony C. S. Readhead, Sebastian Kiehlmann, Matthew L. Lister +6
Compact Symmetric Objects (CSOs), young jetted-AGN of overall projected size <1 kpc, are of great interest due to their youth and evolution. The classification was introduced to di…
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…
Duality in spatially resolved star-formation relations in local LIRGs
M. Sánchez-García, M. Pereira-Santaella, S. García-Burillo +10
We analyse the star formation (SF) relations in a sample of 16 nearby luminous infrared galaxies (LIRGs) with more than 2800 regions defined on scales of 90 to 500 pc. We used ALMA…
Unravelling ultrashort laser excitation of nickel at 800 nm wavelength
T Genieys, M Petrakakis, G Tsibidis +2
The optical response of nickel is studied in a wide range of laser fluence, below and above the ablation threshold, by selfreflectivity measurements of ultrashort 800nm single lase…
Microscopic dynamics and an effective Landau-Zener transition in the quasi-adiabatic preparation of spatially ordered states of Rydberg excitations
A. F. Tzortzakakis, D. Petrosyan, M. Fleischhauer +1
We examine the adiabatic preparation of spatially-ordered Rydberg excitations of atoms in finite one-dimensional lattices by frequency-chirped laser pulses, as realized in a number…
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…
Tracing the Ionization Structure of the Shocked Filaments of NGC 6240
Anne M. Medling, Lisa J. Kewley, Daniela Calzetti +14
We study the ionization and excitation structure of the interstellar medium in the late-stage gas-rich galaxy merger NGC 6240 using a suite of emission line maps at 25 pc res…
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…
A new automated tool for the spectral classification of OB stars
E. Kyritsis, G. Maravelias, A. Zezas +3
(abridged) We develop a tool for the automated spectral classification of OB stars according to their sub-types. We use the regular Random Forest (RF) algorithm, the Probabilistic…