Speaker
Description
The detection of a very extended gamma-ray emission around the Geminga and Monogem pulsars at TeV energies has set a new class of gamma-ray sources called gamma-ray halo. These objects are characterised by the presence of a rather old pulsar (~100 kyr), emitting electrons and positron that are escaping and diffusing away into the interstellar medium, producing a large scale gamma-ray emission by inverse Compton scattering. A gamma-ray halo has also been detected at GeV energy around Geminga by the Fermi-LAT. Appart from Geminga and Monogem, a few other gamma-ray halo candidates have been proposed, amongst them the TeV source 3HWC J1928+178 detected by HAWC.
In this contribution, I present the analysis of the region of 3HWC J1928+178 with 13 years of fermi-LAT data, in order to assess the presence of a gamma-ray halo around 3HWC J1928+178 at GeV energies.
