Liu, Ailin He, Tong-Yu Liu, Ming Han, Zhan-Wen Yang, Rong-Jia
Published in
Journal of Cosmology and Astroparticle Physics
We probe deeply into the characteristics of thin accretion disk surrounding black hole within the brane world paradigm. We investigate how model parameters affect the physical properties of the disk. Our findings indicate that as the tidal charge parameter inherited from the higher dimension increases, the energy flux, the radiation temperature, th...
Knight, B Caballero, O L Schatz, H
Published in
Journal of Physics G: Nuclear and Particle Physics
At the low temperature and high density conditions of a neutron star crust neutrons are degenerate. In this work, we study the effect of this degeneracy on the capture rates of neutrons on neutron rich nuclei in accreted crusts. We use a statistical Hauser–Feshbach model to calculate neutron capture rates and find that neutron degeneracy can increa...
Bobrikova, Anna Forsblom, Sofia V. Di Marco, Alessandro La Monaca, Fabio Poutanen, Juri Ng, Mason Ravi, Swati Loktev, Vladislav Kajava, Jari J. E. Ursini, Francesco
...
Weakly magnetized neutron stars in X-ray binaries show complex phenomenology with several spectral components that can be associated with the accretion disk, boundary and/or spreading layer, a corona, and a wind. Spectroscopic information alone is, however, not enough to disentangle these components. Additional information about the nature of the s...
Zare, Soroush Nieto, Luis M. Feng, Xing-Hui Dong, Shi-Hai Hassanabadi, Hassan
Published in
Journal of Cosmology and Astroparticle Physics
The Event Horizon Telescope (EHT) imaging of the supermassive black holes at the centers of Messier 87 galaxy (M87) and the Milky Way galaxy (Sgr A) marks a significant step in observing the photon rings and central brightness depression that define the optical appearance of black holes with an accretion disk scenario. Inspired by this, we take int...
Al Zahrani, A. M. Al-Jama, A.
Published in
Research in Astronomy and Astrophysics
We study the capture cross-section of charged particles by a weakly charged Schwarzschild black hole. The dependence of the maximum impact parameter for capture on the particle’s energy is investigated numerically for different values of the electromagnetic coupling strength between the particle and the black hole. The capture cross-section is then...
Navale, Nilam R Pawar, Devraj Rao, A.R Misra, Ranjeev Chakraborty, Sudip Bhattacharyya, Sudip Bambole, Vaishali A
XB 1254-690 is a neutron star low-mass X-ray binary with an orbital period of 3.88 hrs, and it exhibits energy-dependent intensity dips, thermonuclear bursts, and flares. We present the results of an analysis of a long observation of this source using the AstroSat satellite. The X-ray light curve gradually changed from a high-intensity flaring stat...
Mutuku, Kieti
Published in
Physica Scripta
Empirical observations have revealed that Newtonian dynamics do not correspond with the amount of visible matter in galactic scales. This imply that there is a vast amount of unseen matter or failure of the theory of gravity in galactic scales or something else. This paper demonstrates that gravitationally coupled bodies offset the center of mass o...
Donmez, Orhan
Published in
Research in Astronomy and Astrophysics
The study of a disturbed accretion disk holds great significance in the realm of astrophysics, as such events play a crucial role in revealing the nature of disk structure, the release of energy, and the generation of shock waves. Consequently, they can help explain the causes of X-ray emissions observed in black hole accretion disk systems. In thi...
Guerra, Corentin Meliani, Zakaria Voisin, Guillaume
The detected population of "spiders", referring to millisecond pulsar binaries, has significantly grown in the past decade thanks to multiwavelength follow-up investigations of unidentified Fermi sources. These systems consist of low-mass stellar companions orbiting rotation-powered millisecond pulsars in short periods of a few hours up to day. Amo...
Capuano, Lodovico Santoni, Luca Barausse, Enrico
The mass of a black hole can dynamically evolve due to various physical processes, such as for instance accretion, Hawking radiation, absorption of gravitational/electromagnetic waves, superradiance, etc. This evolution can have an impact on astrophysical observables, like the ringdown gravitational signal. An effective description of a spherically...
