High-luminosity PeVatrons exist in our galaxy, according to observations made with LHAASO. In this work, we analyze two notable sources, LHAASO J1825-1326 and LHAASO J1839-0545. Two alternative origins for each PeVatron are indicated by the low angular resolution of the LHAASO devices. LHAASO J1825-1326 may have originated from the pulsars PSR J1826-1334 and PSR J1826-1256, whereas LHAASO...
This study investigates the potential of blazar jets as sources of ultra-high-energy cosmic rays (UHECRs), astrophysical neutrinos, and gamma rays through a multi-messenger analysis, focusing on four specific blazars: W Comae, 1ES 1959+650, PKS 2005-489, and PKS 2155-304. We analyze the interactions between high-energy protons and photons within the relativistic jets produced by blazars to...
Será analisado um modelo de matéria escura baseado em um setor escuro mínimo com aniquilações. O trabalho consiste em investigar a possibilidade de a matéria escura do halo galáctico acumular-se em Júpiter e, nos moldes de trabalhos semelhantes que realizaram a análise dessa hipótese para o Sol, aniquilar-se em um mediador de vida longa, que possibilite o decaimento em raios gama fora do corpo...
Since the discovery of cosmic rays, much effort has been put into interpreting their observed properties, such as the energy spectrum, the composition and their arrival direction, in the context of phenomenological models. Additionally, the sources are frequently assumed to emit cosmic rays isotropically or in a tightly collimated jet pointing towards Earth.
In this work, we investigate (by...
In this work, we explore the parameter space of the Oscillating Asymmetric Dark Matter (OADM) model, with a dark matter particle whose mass lies in the sub-GeV region. The OADM model proposes a new approach to the core-cusp problem in order to resolve the tension between the predictions of the ΛCDM model and the observations of dark matter profiles in dwarf spheroidal galaxies. A new mechanism...
Magnetars are neutron stars with extremely intense magnetic fields and are commonly associated with supernova remnants and pulsar wind nebulae, which are potential sources of Galactic cosmic rays. These objects are expected to emit non-thermal very high-energy gamma rays, indicative of particle acceleration processes. This study investigates the very high-energy gamma-ray emission in the...
Despite substantial evidence for the existence of astrophysical dark matter, its nature remains undetermined. One primary focus in the search for dark matter (DM) is Weakly Interacting Massive Particles (WIMPs), which are particles with masses in the GeV-TeV range and weak-scale interaction strength. A major method for probing the existence of dark matter particles is through indirect...
Nowadays, up to 50 Dwarf Galaxies have been found by actual detectors. However, new generation experiments like the Vera Rubin telescope will be able to detect many more of these objects (called the faint dwarf galaxies).
On the other hand the SWGO detector (english abbreviation of The Southern Wide-field
Gamma-ray Observatory ), is a new gamma ray telescope which will be located on...
