PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAI - Gamma Ray Indirect
HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere
G. Verna*, F. Cassol, H. Costantini  on behalf of the CTA Consortium
Full text: pdf
Pre-published on: August 03, 2021
Published on: March 18, 2022
Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO
confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from
a region coincident with molecular clouds and significantly displaced from the nearby pulsar
J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic
models can describe the current VHE gamma-ray emission. The morphology of the source is not
well constrained by the present measurements and a better characterisation would greatly help
the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope
Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and,
thanks to its unprecedented angular resolution, could contribute to better constrain the nature of
this source. The present work investigates the potentiality of CTA to study the morphology and
the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic
model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and
two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and
observation times are considered. A 3D map based analysis shows that CTA is able to significantly
detect the extension of the source and to attribute higher detection significance to the simulated
molecular cloud template compared to the alternative one. CTA data does not allow to disentangle
the hadronic and the leptonic emission models. However, it permits to correctly reproduce the
simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff.
DOI: https://doi.org/10.22323/1.395.0904
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