Ground based Imaging Atmospheric Cherenkov Telescopes have proven to be very powerful in detecting very high energy gamma-ray source (>100 GeV). Nevertheless, their limited field-of-view (~2 degrees in radius) makes the detection of large emission, as for pulsar halos, quite challenging. This is due to the presence of a strong residual hadronic background which is usually statistically removed...
Milagro and HAWC observations have revealed the existence of TeV halos around nearby, relatively old pulsars. We perform population modeling of TeV halos taking into account the age dependence of halo formation. Our analysis highlights the potential importance of TeV halos in existing and future observations by HAWC, HESS, and CTA. We quantify the contributions of TeV halos to the source...
The PAMELA, Fermi-LAT, and AMS-02 experiments measured a local excess of positrons above energies of 10 GeV. This excess has been considered to be due to dark matter interactions or the presence of nearby astrophysical sources. Here, I present preliminary results on the follow-up study of diffusion in the region of the pulsar Geminga with approximately five years of HAWC data. I implement a...
The recent discovery of long-lived and large-size gamma-ray emission structures around a handful of middle-aged pulsars raised the question of their actual place in the high-energy and very-high-energy landscape, first and foremost in the Milky Way but more generally in all star-forming galaxies. If most pulsars develop such gamma-ray halos over several 100kyr, harnessing the gamma-ray...
The interpretation of large gamma-ray halos around middle-aged pulsars as electron/positron pairs emitting from inverse-Compton scattering of ambient photon fields naturally leads one to think about the necessary counterpart of such a system: radio synchrotron halos.
In this contribution, we introduce some first investigations of the detectability of such radio sources in the Milky Way. We...
The gamma-ray source 3HWC J1928+178, discovered by HAWC, is coincident with PSR J1928+1746, a 82 kyr pulsar located 4 kpc away. It has not been reported by any IACT, until the recent detection by HESS of emission from this region using an analysis adapted to extended sources.
No counterpart in GeV gamma-rays from Fermi-LAT data or from X-ray observations has been reported so far. In this...
Taking advantage of more than 11 years of Fermi-LAT data, we perform a new and deep analysis of the pulsar wind nebula (PWN) HESS J1825–137. We present the results of the spectral analysis and of the first energy-resolved morphological study of the PWN HESS J1825-137 from 1 GeV to 1 TeV. This PWN is an archetypal system making it a perfect laboratory for studying particle transport...
