125 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Northern Border UniversitySA30 papers
- Centre National de la Recherche ScientifiqueFR16 papers
- Taibah UniversitySA16 papers
- Cairo UniversityEG12 papers
- Instituto de Astrofísica de AndalucíaES11 papers
- Université Paris CitéFR11 papers
- Astrophysique, Instrumentation et ModélisationFR10 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR10 papers
- Leibniz Institute for Astrophysics PotsdamDE10 papers
- Sorbonne UniversitéFR10 papers
- Astronomical ObservatoryRS9 papers
- CEA Paris-SaclayFR9 papers
187 papers
Long-term Orbital Period Variations of the Eclipsing Dwarf Nova HT Cas
Aykut Ozdonmez, Huseyin Er, Ilham Nasiroglu +7
We present a comprehensive analysis of the long-term orbital period variations in the short-period eclipsing dwarf nova HT Cas. By combining our new high-precision mid-eclipse time…
COSMOS-Web: Galaxy Size and Surface Brightness Evolution at Rest-Frame 1.22 m Since
Si-Yue Yu, Andreas L. Faisst, Taotao Fang +7
We present the evolution of galaxy size and surface brightness in the rest-frame band (1.22 m), tracing the stellar mass distribution, over , using a samp…
Identification of low redshift groups and clusters of galaxies in the X-CLASS survey and the X-ray luminosity-temperature relation
Q. Moysan, F. Sarron, N. Clerc +16
Properties of the hot intracluster and intragroup medium are mostly set by the underlying gravitational potential well, although complex astrophysical processes at play during thei…
Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions
D. Akl, S. Antier, H. Koehn +105
Most long gamma-ray bursts (GRBs) exhibit afterglows broadly consistent with external forward-shock emission, typically described by smooth broken power-law decays in the multiband…
Minutes-long soft X-ray prompt emission from a compact object merger
An Li, Chen-Wei Wang, Niccolò Passaleva +75
Compact object mergers are multi-messenger sources and known progenitors of some gamma-ray bursts, bright flashes of high-energy radiation powered by a central engine, either an ac…
Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
O. Vince, C. M. Raiteri, M. Villata +72
(Shortened)Context: We analyze the optical variability of the FSRQ Ton 599 using BVRI photometry from the WEBT collaboration (2011-2023), complemented by photometric and spectrosco…
A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations
J. L. Ortiz, N. Morales, B. Sicardy +98
Trans-Neptunian objects (TNOs) are among the most ancient bodies of the solar system. Understanding their physical properties is key to constraining their origin and the evolution…
COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction
Greta Toni, Matteo Maturi, Gianluca Castignani +33
We investigate the redshift and group richness dependence of the quiescent fraction and red-sequence (RS) parameters in COSMOS galaxy groups from z=0 to z=3.7. We analyzed the deep…
Interstellar comet 3I/ATLAS: discovery and physical description
Bryce T. Bolin, Matthew Belyakov, Christoffer Fremling +18
We describe the physical characteristics of interstellar comet 3I/ATLAS, discovered on 2025 July 1 by the Asteroid Terrestrial-impact Last Alert System. The comet has eccentricity,…
From the Densest Clusters to the Emptiest Voids: No Evidence For Environmental Effects on the Galaxy Size-Mass Relation at Low Redshift
Mohamed H. Abdullah, Nouran E. Abdelhamid, Rasha M. Samir +1
We present a comprehensive study of the galaxy size-stellar mass relation (SMR) at low redshift (z <= 0.125), using a large spectroscopic sample from the SDSS-DR13 survey. Our goal…
Multi-wavelength variability analysis of the blazar S5 0716+714 during a long-lasting period of low activity
B. M. Mihov, E. G. Elhosseiny, L. S. Slavcheva-Mihova +3
We conducted a multi-wavelength monitoring campaign of the blazar S5 0716+714 from 2022 November 26 to 2023 May 28 using optical telescopes in Egypt and Bulgaria. Data were taken d…
COSMOS Web: Morphological quenching and size-mass evolution of brightest group galaxies from z = 3.7
Ghassem Gozaliasl, Lilan Yang, Jeyhan Kartaltepe +47
We present a comprehensive study of the structural evolution of Brightest Group Galaxies (BGGs) from redshift to using the \textit{James Webb Space Telesc…
Study of Open Star Clusters Using the Gaia DR3: I- Poorly Studied King 2 and King 5
Aly Haroon, Waleed Elsanhoury, Essam Elkholy +2
In this study, we utilize photometric and kinematic data from \textit{Gaia} DR3 and the {\sc ASteCA} package to analyze the sparsely studied open clusters, King 2 and King 5. For K…
Limits on the Ejecta Mass During the Search for Kilonovae Associated with Neutron Star-Black Hole Mergers: A case study of S230518h, GW230529, S230627c and the Low-Significance Candidate S240422ed
M. Pillas, S. Antier, K. Ackley +78
Neutron star-black hole (NSBH) mergers, detectable via their gravitational-wave (GW) emission, are expected to produce kilonovae (KNe). Four NSBH candidates have been identified an…
A wiggling filamentary jet at the origin of the blazar multi-wavelength behaviour
C. M. Raiteri, M. Villata, M. I. Carnerero +96
Blazars are beamed active galactic nuclei known for their strong multi-wavelength variability on timescales from years down to minutes. We aim to investigate the suitability of the…
Spectral Evolution and Photo-ionization Analysis of Nova Cas 2020 (V1391 Cas)
Gamal M. Hamed, Hasan. H. Esenoglu, Almaz. I. Galeev
We present spectroscopic observations of Nova Cas 2020(V1391 Cas) obtained using the Russian Turkish Telescope during different stages of its 2020 outburst. We followed the spectra…
Stability Analysis Of Fractional Relativistic Polytropes
Mohamed S. Aboueisha, A. S. Saad, Mohamed I. Nouh +3
In astrophysics, the gravitational stability of a self-gravitating polytropic fluid sphere is an intriguing subject, especially when trying to comprehend the genesis and developmen…
Multi-instrument analysis of L-band amplitude scintillation observed over the Eastern Arabian Peninsula
Abdollah Masoud Darya, Muhammad Mubasshir Shaikh, Grzegorz Nykiel +2
This study investigates the spatial and temporal characteristics of L1 amplitude scintillation-causing ionospheric irregularities over the Eastern Arabian Peninsula during the asce…
An in-depth analysis of the differentially expanding star cluster Stock 18 (Villafranca O-036) using Gaia DR3 and ground-based data
J. Maíz Apellániz, A. R. Youssef, M. S. El-Nawawy +4
(ABRIDGED) CONTEXT: The Villafranca project is combining Gaia data with ground-based surveys to analyze Galactic stellar groups with OB stars. AIMS: We want to analyze Stock 18 wit…
The Correlation Function and Detection of Baryon Acoustic Oscillation Peak from the Spectroscopic SDSS GalWCat Galaxy Cluster Catalogue
Mohamed H. Abdullah, Anatoly Klypin, Francisco Prada +3
We measure the two point correlation function (CF) of 1357 galaxy clusters with a mass of ~\hm~and at a redshift of . This work differs f…
UBVRI night sky brightness at Kottamia Astronomical Observatory
Mohamed F. Aboushelib, Abdelfady B. Morcos, Samir Nawar +2
Photoelectric observations of night sky brightness (NSB) at different zenith distances and azimuths, covering all the sky, at the Egyptian Kottamia Astronomical observatory (KAO) s…
Multi-parameter study for a new Ground-Based telescope in Egypt
Mohamed S. Darwish, Hazem Badreldin, Nasser M. Ahmed +10
A multi-parameter analysis was conducted to evaluate the impact of meteorological parameters, night sky brightness and seismic hazard on proposed sites for the new optical/infrared…
Scenario-based Tsunami hazard assessment for Northeastern Adriatic coasts
Antonella Peresan, Hany M. Hassan
Significant tsunamis in Northern Adriatic are rare and only a few historical events were reported in the literature, with sources mostly located along with central and southern par…
Open superclusters I: The most populated primordial groups of open clusters in the third quadrant of the Galactic disc
Juan Casado, Yasser Hendy
An open supercluster (OSC) is defined as a cluster of at least six open clusters (OCs) born from the same giant molecular cloud (GMC). We survey the recent catalogs of OCs based on…