Speaker
Description
A TeV halo is defined as the Inverse Compton emission from $e^\pm$
diffusing in the Interstellar Medium, injected by a Pulsar Wind
Nebula (PWN). The pulsars surrounded by such halos are generally
older than those powering the TeV PWNe identified in the H.E.S.S
Galactic Plane Survey (HGPS). We revisit the HGPS sources in search
of halo candidates among coincidences between TeV components and
older pulsars. We also search for coincidences in the recently
released first LHAASO source catalog. We employ a diffusion
model of the particle transport in halos to attempt to discriminate
observationally between halos and older PWNe. Finally, we outline
the recent development of more powerful H.E.S.S. analysis techniques,
including spectro-morphological fitting, hadronic shower background
models, and gas-template-based Galactic diffuse emission models,
which should yield an improved description of extended sources such
as halo candidates.
