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236 papers · 1 filter
A model for the polarization of the high-energy radiation from accreting black holes: the case of XTE J1118+480
Florencia L. Vieyro, Gustavo E. Romero, Sylvain Chaty
The high-energy emission ( keV MeV) of Cygnus X-1 --the most well-studied Galactic black hole-- was recently found to be strongly polarized. The origin of this radiation…
A mechanism for fast radio bursts
Gustavo E. Romero, Maria Victoria del Valle, Florencia L. Vieyro
Fast radio bursts are mysterious transient sources likely located at cosmological distances. The derived brightness temperatures exceed by many orders of magnitude the self-absorpt…
Temperature and high-pressure dependent X-ray absorption of SmNiO3 at the Ni K- and Sm L3- edges
Néstor E. Massa, Aline Y. Ramos, Helio C. N. Tolentino +3
We report on XANES and EXAFS measurements of SmNiO3 from 20 K to 600 K and up to 38 GPa at the Ni K- and Sm L3- edges. A multiple component pre- Ni K-edge tail is understood origin…
The AIMSS Project III: The Stellar Populations of Compact Stellar Systems
Joachim Janz, Mark A. Norris, Duncan A. Forbes +11
In recent years, a growing zoo of compact stellar systems (CSSs) have been found whose physical properties (mass, size, velocity dispersion) place them between classical globular c…
The Constant-Sound-Speed parameterization for NJL models of quark matter in hybrid stars
Ignacio F. Ranea-Sandoval, Sophia Han, Milva G. Orsaria +3
The discovery of pulsars as heavy as 2 solar masses has led astrophysicists to rethink the core compositions of neutron stars, ruling out many models for the nuclear equations of s…
750 GeV diphotons from closed string states
Luis A. Anchordoqui, Ignatios Antoniadis, Haim Goldberg +3
We show that low-mass-scale string compactifications, with a generic D-brane configuration that realizes the standard model by open strings, can explain the relatively broad peak i…