Low frequency radio observation of the dark PeVatron 1LHAASO J2108+5153u using uGMRT

Abstract

1LHAASO J2108+5153u, a PeVatron candidate detected by Large High Altitude Air Shower Observatory (LHAASO), has no known association in any other wavelength range. In this work we attempted to identify any possible association by observing the source region in low frequency radio band. 1LHAASO J2108+5153u was observed by upgraded Giant Metrewave Radio Telescope (uGMRT) at 650 MHz frequency. The data were analysed to map and spatially correlate the sources in the field of view with the LHAASO detected source. We identified a new extended source within the LHAASO PSF showing a distinct jet and core structure in radio band. The exact nature of the source could not be identified with the present observation. It can be a microquasar and the particles can be accelerated to PeV energies in the microquasar jet.