Miguel A. Sánchez-Conde

Cascades from ultra-high-energy neutrinos

Gaetano Di Marco, Rhorry Gauld, Rafael Alves Batista, Alfonso García-Soto et autres

Neutrinos produced at the highest energies can interact with cosmic neutrino and radiation backgrounds during their propagation to Earth. The many available $νν$, $ν\barν$, and $νγ$ channels can lead to their absorption or energy redistribution, whilst the leptonic and hadronic final states …

Exploring the Nature of Galactic Unassociated Sources Detected by the Fermi-LAT

F. Acero, A. Acharyya, A. Adelfio, Marco Ajello et autres

Abstract We investigate the nature of the unassociated sources detected by the Fermi-LAT close (∣ b ∣ < 10°) to the Galactic plane, representing 16% of all sources in the 4FGL-DR4 catalog. The bulk of these sources (referred to as soft Galactic …

fr, dk, it, us, es, de, jp, cn, pt, ro, va (code pays fourni par la source)

Sensitivity of the Cherenkov Telescope Array Observatory to Gamma-Ray Signals in Dwarf Irregular Galaxies

Jaume Zuriaga-Puig, Viviana Gammaldi, Miguel A. Sánchez-Conde

Dwarf irregular galaxies (dIrrs) are rotationally supported galaxies with a low star formation rate. Thus, their gamma-ray astrophysical emission is expected to be low, making them interesting targets for WIMP dark matter (DM) indirect searches. In this work, we build upon previous …

Sensitivity of the Cherenkov Telescope Array Observatory to Gamma-Ray Signals in Dwarf Irregular Galaxies

Jaume Zuriaga-Puig, Viviana Gammaldi, Miguel A. Sánchez-Conde

Dwarf irregular galaxies (dIrrs) are rotationally supported galaxies with a low star formation rate. Thus, their gamma-ray astrophysical emission is expected to be low, making them interesting targets for WIMP dark matter (DM) indirect searches. In this work, we build upon previous …

es (code pays fourni par la source)

Constraints on ultra-heavy DM from TeV-PeV gamma-ray diffuse measurements

Manuel Rocamora, Pedro De la Torre Luque, Miguel A. Sánchez-Conde

Recent experiments have measured the Galactic γ -ray diffuse emission up to PeV energies, opening a window to study acceleration of Galactic cosmic rays and their propagation up to the cosmic-ray knee. Furthermore, these observations provide a powerful tool to set strong …

at, es (code pays fourni par la source)

Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification

Federica Giacchino, Cristina Fernández-Suárez, Miguel A. Sánchez-Conde, M. Ángeles Pérez-García et autres

In the 4FGL-DR4 point-source catalog of the Large Area Telescope (LAT) onboard NASA's Fermi Gamma-ray Observatory (Fermi-LAT), around a third of the sources are still unidentified (unIDs). In this work, we perform a detailed study of one of them, namely 4FGL J2112.5-3043. …

The impact of gamma-ray propagation effects on indirect dark matter searches

Ignacio Martínez López, Rafael Alves Batista, Miguel A. Sánchez-Conde, Antonio Juan Rubio-Montero

In this work, we investigate dark matter (DM) detection in the context of weakly interacting massive particles (WIMPs). Upon annihilation, WIMPs generate cascades of secondary particles through various channels, many of which culminate in the production of gamma rays. As these gamma …

The impact of gamma-ray propagation effects on indirect dark matter searches

Ignacio Martínez López, Rafael Alves Batista, Miguel A. Sánchez-Conde, A. J. Rubio Montero

In this work, we investigate dark matter (DM) detection in the context of weakly interacting massive particles (WIMPs). Upon annihilation, WIMPs generate cascades of secondary particles through various channels, many of which culminate in the production of gamma rays. As these gamma …

es (code pays fourni par la source)

Combined dark matter search towards dwarf spheroidal galaxies with Fermi -LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

S. Abdollahi, L Baldini, R Bellazzini, B. Berenji et autres

Abstract Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low astrophysical background. The sensitivity of these searches is improved by combining the observations …

fr, it, us, de, Afrique du Sud, es, jp, cn, at, dk, th, si, mx, pl (code pays fourni par la source)

Impact of baryons on the population of Galactic subhalos and implications for dark matter searches

Sara Porras-Bedmar, Miguel A. Sánchez-Conde, Alejandra Aguirre-Santaella

We have used Auriga --a set of state-of-the-art cosmological hydrodynamical simulations of Milky Way-size systems-- to study the impact of baryons on the Galactic subhalo population. A DM-only run counterpart of Auriga allows us to compare results with and without baryons. We …

Gamma rays as leptonic portals to energetic neutrinos: A new Monte Carlo approach

Rafael Alves Batista, Miguel A. Sánchez-Conde

High center-of-mass electromagnetic (EM) interactions could produce decaying heavy leptons and hadrons, leading to neutrino generation. These processes might occur in the most extreme astrophysical scenarios, potentially altering the expected gamma-ray and neutrino fluxes in both the hadronic and the leptonic pictures. …

es, fr (code pays fourni par la source)

New insights on low-mass dark matter subhalo tidal tracks via numerical simulations

Alejandra Aguirre-Santaella, Miguel A. Sánchez-Conde, Go Ogiya

ABSTRACT Several studies assert that dark matter (DM) subhaloes without a baryonic counterpart and with an inner cusp always survive. We conduct numerical simulations to analyse the evolution of the circular velocity peaks ($V_\mathrm{max}$, and its radial value $r_\mathrm{max}$) and concentration of …

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