7 papers

astro-ph.GA2026

The Radial Acceleration Relation in Galaxies and Clusters from a Two-Component, Virial-Motivated Framework

Christine C. Dantas, Andre L. B. Ribeiro, Hugo V. Capelato

We present a comparative analysis of acceleration data for gravitational systems drawn from multiple observational sources, including: (i) early-type galaxies (ETGs) (Lelli et al.…

astro-ph.HE2026

Sensitivities of Black Hole Images from GRMHD Simulations

Pedro Naethe Motta, Mário Raia Neto, Cora Prather +1

The advent of high-fidelity imaging of supermassive black holes calls for efficient and robust data-analysis methods. In this work, we use , a differentiable, $\te…

astro-ph.SR2026

Spectroscopic analysis of RGB stars in nine open clusters

Saulo de Oliveira Cantanhêde, Alan Alves-Brito, Rodolfo Smiljanic +4

Stellar clusters are crucial tools for studying the age, spatial distribution, dynamics, kinematics, and chemical composition of different Galactic stellar populations. In this wor…

astro-ph.HE2026

The mass of the neutron star in 4U 1820-30 revisited

Marcio G B de Avellar, Jorge E Horvath, Nathalia D Pires +7

We revisit the mass of the neutron star in the ultracompact binary 4U 1820--30 in light of a recently reported transient absorption feature at about 3.8 keV, interpreted as a gravi…

hep-ph2026

Electric and magnetic timelike form factors of hyperons at large transfer momentum

G. Ramalho, M. T. Peña, K. Tsushima +1

There has been considerable progress in the study of the electromagnetic form factors of baryons in the timelike region, through electron-positron scattering reactions ($e^+ e^- \t…

astro-ph.HE2026

Chasing Gamma-Ray Signals from Binary Neutron Star Coalescences with the Cherenkov Telescope Array: Prospects and Observing Strategies

S. Abe, J. Abhir, A. Abhishek +457

The detection of gravitational waves (GWs) from a binary neutron star (BNS) merger by Advanced LIGO and Advanced Virgo (GW170817), together with its electromagnetic counterpart, th…