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Absorption and emission lines in the optical spectrum are typically used toinvestigate the presence of large-scale environments in active galactic nuclei(AGNs). BL Lac objects - which are a category of AGNs with the relativistic jetpointing directly to the observer - are supposed to represent a late evolutionstage of AGNs. Their large-scale structures are probably poorer of material,which is distributed with lower densities throughout the circumnuclearenvironment. Their accretion disk is weak and weakly reprocessed, making thenon-thermal continuum of the relativistic jet dominate their optical spectrumand preventing us from identifying the thermal emission of the photon fieldsproduced by such large-scale structures. However, these photon fields may stillexist and eventually interact with the gamma rays traveling in the blazar jetvia gamma-gamma pair production, producing observable effects such asabsorption features in their spectral energy distribution. Interestingly, thesame photon field might also lead to the production of high-energy neutrinos,acting as targets for proton-photon interactions. In this contribution, wepresent the results of a set of simulations over a wide parameter spacedescribing both the blazar jet and the photon field properties. We discuss themost effective conditions that may produce fluxes of neutrinos compatible withthe sensitivities of the current and the next generation of neutrino detectors.We will also discuss how the possible neutrino flux would be related to theproperties of the large-scale structures investigated indirectly through theanalysis of the gamma-ray spectrum of the BL Lac object.

Neutrinos from interactions between the relativistic jet and large-scale structures of BL Lac objects investigated through their gamma-ray spectrum