Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Argüelles, C. R."'
Publikováno v:
A&A 685, A24 (2024)
The study of the physics of accretion discs developed around the supermassive black hole (BH) candidates are essential theoretical tools to test their nature. Here, we study the accretion flow and associated emission using generalised $\alpha$-discs
Externí odkaz:
http://arxiv.org/abs/2402.12491
Autor:
Argüelles, C. R., Boshkayev, K., Krut, A., Nurbakhyt, G., Rueda, J. A., Ruffini, R., Uribe-Suárez, J. D., Yunis, R.
Observations support the idea that supermassive black holes (SMBHs) power the emission at the center of active galaxies. However, contrary to stellar-mass BHs, there is a poor understanding of their origin and physical formation channel. In this arti
Externí odkaz:
http://arxiv.org/abs/2305.02430
The nature of dark matter (DM) is one of the most relevant questions in modern astrophysics. We present a brief overview of recent results that inquire into a possible fermionic quantum nature of the DM particles, focusing mainly on the interconnecti
Externí odkaz:
http://arxiv.org/abs/2304.06329
Galaxies show different halo scaling relations such as the Radial Acceleration Relation, the Mass Discrepancy Acceleration Relation (MDAR) or the dark matter Surface Density Relation (SDR). At difference with traditional studies using phenomenologica
Externí odkaz:
http://arxiv.org/abs/2302.02020
Autor:
Argüelles, C. R., Mestre, M. F., Becerra-Vergara, E. A., Crespi, V., Krut, A., Rueda, J. A., Ruffini, R.
It has been recently demonstrated that both, a classical Schwarzschild black hole (BH), and a dense concentration of self-gravitating fermionic dark matter (DM) placed at the Galaxy centre, can explain the precise astrometric data (positions and radi
Externí odkaz:
http://arxiv.org/abs/2109.10729
The motion data of the S-stars around the Galactic center gathered in the last 28 yr imply that Sgr A* hosts a supermassive compact object of about $4\times 10^6$ $M\odot$, a result awarded with the Nobel Prize in Physics 2020. A non-rotating black h
Externí odkaz:
http://arxiv.org/abs/2105.06301
Autor:
Yunis, R., Argüelles, C. R., Mavromatos, N. E., Moliné, Á., Krut, A., Carinci, M., Rueda, J. A., Ruffini, R.
Publikováno v:
Physics of the Dark Universe 30 (2020) 100699
The neutrino minimal standard model ($\nu$MSM) has been tightly constrained in the recent years, either from dark matter (DM) production or from X-ray and small-scale observations. However, current bounds on sterile neutrino DM can be significantly m
Externí odkaz:
http://arxiv.org/abs/2008.08464
Akademický článek
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We analyze the intriguing possibility to explain both dark mass components in a galaxy: the dark matter (DM) halo and the supermassive dark compact object lying at the center, by a unified approach in terms of a quasi-relaxed system of massive, neutr
Externí odkaz:
http://arxiv.org/abs/1905.09776
Autor:
Yunis, R., Argüelles, C. R., Mavromatos, N. E., Moliné, A., Krut, A., Rueda, J. A., Ruffini, R.
We calculate the most stringent constraints up to date on the parameter space for sterile neutrino warm dark matter models possessing a radiative decay channel into X-rays. These constraints arise from the X-ray flux observations from the Galactic ce
Externí odkaz:
http://arxiv.org/abs/1810.05756