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Unveiling the molecular environment of the enigmatic PeVatron candidate LHAASO J2108+5157

Abstract:

We summarize the results of previous works in which we analyzed the molecular environment around the PeVatron candidate LHAASO J2108+5157, using <sup>12,13</sup>CO observations. As specific case, we present evidence that the observed sub-PeV emission is produced in two molecular clouds as cosmic-ray targets ([FKT-MC]2022 and [FTK-MC]) with two different LSR velocities but with the same distances. We recalculate the distance of [FKT-MC]2022, obtaining the value of 1.6 kpc. We suggest that both clouds are part of the same structure, where [FTK-MC] is blueshifted with respect to [FKT-MC]2022 favoring gravitational collapse and star formation.