Conveners
Parallel 3C - Indirect searches
- PIERRE SALATI (LAPTh & Université de Savoie Mont Blanc)
Parallel 3C - Indirect searches
- PIERRE SALATI (LAPTh & Université de Savoie Mont Blanc)
The excess of gamma rays in the data measured by the Fermi Large Area Telescope from the Galactic center region is one of the most intriguing mysteries in Astroparticle Physics. This Galactic center excess (GCE), has been measured with respect to different interstellar emission models, source catalogs, data selections and techniques. Although several proposed interpretations have appeared in...
The Galactic center excess (GCE) remains one of the most intriguing discoveries from the \textit{Fermi} Large Area Telescope (LAT) observations. I will revisit the characteristics of the GCE by first producing a new set of high-resolution galactic diffuse gamma-ray emission templates. This diffuse emission, which accounts for the bulk of the observed gamma rays, is ultimately due to...
We present a new reconstruction of the distribution of atomic hydrogen in the inner Galaxy that is based on explicit radiation-transport modelling of line and continuum emission and a gas-flow model in the barred Galaxy that provides distance resolution for lines of sight toward the Galactic Center. The main benefits of the new gas model are, a), the ability to reproduce the negative line...
We estimate the sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse gamma-ray emission from the Perseus galaxy cluster, both from interactions of cosmic rays (CR) with the intra-cluster medium, and as a product of annihilation or decay of dark matter (DM) particles in case they are weakly interactive massive particles (WIMPs). The observation of Perseus constitutes one of the...
Galaxy clusters are the largest virialised objects in the Universe and, as such, have high dark matter (DM) concentrations. This abundance of dark matter makes them promising targets for indirect DM searches.
Here we report the details of a search, utilising almost 12~years of Fermi/LAT data, for gamma ray signatures from the pair annihilation of WIMP dark matter in the GeV energy band....
Feebly interacting particles (FIPs), such as axion-like particles, sterile neutrinos and dark photons, with masses O(10–100) MeV can be efficiently produced in core-collapse supernovae and escape the supernova envelope. During propagation in the interstellar medium, these particles may decay into electron-positron pairs, generating a positron flux. Such positrons would annihilate with...
NA61/SHINE is a large-acceptance fixed-target experiment located at the CERN SPS, which studies final hadronic states in interactions of various particles and nuclei. It is unique in terms of providing data on a variety of collision systems at different collision energies. This allows for wide deuteron, antiproton and antideuteron production cross-section studies. The latter are currently...
Pulsars dominate the local cosmic-ray positron flux at high energies by producing electron-positron pairs from their spindown energy. While the AMS-02 experiment, that measures the cosmic-ray flux to great precision, shows that the positron flux is very smooth, simple simulations of pulsar models predict sharp spectral features. In this work, we add several mechanisms to model the local...
Annihilation or decay of dark matter (DM) could contribute to the electron and positron cosmic-ray flux, thus the parameter space of DM candidate models can be probed by these messengers. The signature's location in energy is closely correlated with the DM mass, making the TeV-range of these spectra most important for studying heavy DM of models beyond the WIMP paradigm.
Among the ISS-based...
A fundamental question regarding the Fermi Galactic Center Excess (GCE) is whether the underlying structure is point-like or smooth. This debate, often framed in terms of a millisecond pulsar or annihilating dark matter (DM) origin for the emission, awaits a conclusive resolution. We weigh in on the problem using graph-convolutional neural networks and estimate the fluxes of different emission...
The General Anti Particle Spectrometer (GAPS) is a balloon-borne cosmic-ray experiment
currently under construction and scheduled for a long duration balloon flight from McMurdo
Station in the Antarctic.
Its primary science goal is the search for light antinuclei in cosmic rays at kinetic energies in
below 0.25 GeV/n. This energy region is especially of interest for beyond-the-standard...
GRAMS (Gamma-Ray and AntiMatter Survey) is a next-generation proposed balloon/satellite mission that will be the first to target both MeV gamma-ray observations and antimatter measurements with a LArTPC (Liquid Argon Time Projection Chamber) detector. With a cost-effective, large-scale LArTPC, GRAMS can have extensively improved sensitivities to both MeV gamma rays and antiparticles compared...
MadDM is an automated numerical tool for the computation of dark-matter observables for generic new physics models based on the Monte Carlo generator MadGraph5_aMC@NLO. Notably, the code provides a comprehensive framework for the reinterpretation of direct and indirect detection searches. For instance, it allows the user to compute the fully differential nuclear recoil rates as well as the...
