Neutrino Emission from Gamma-ray Burst Jet Propagating inside the Cavity within Active Galactic Nucleus Accretion Disks

TL;DR

This paper investigates how the photon field within AGN disks affects neutrino emission from sGRB jets, revealing suppression at high energies and potential for joint electromagnetic-neutrino observations to probe jet structure.

Contribution

It introduces a model of neutrino emission from two-component sGRB jets inside AGN disks, accounting for the photon field's impact on neutrino spectra, which is a novel approach.

Findings

High-energy neutrino flux is suppressed due to AGN photon field.

Lower-energy neutrino flux is enhanced in the presence of the AGN photon field.

Neutrino spectra can show a two-bump structure indicating jet components.

Abstract

Short gamma-ray bursts (sGRBs) from the merger of binary compact objects (BCOs) could occur in the accretion disks of the active galactic nucleus (AGN). Before merging, the BCO will inevitably form a low-density cavity. The sGRB jet will interact with the AGN disk photons during its propagation through the cavity, leading to unique electromagnetic and neutrino signatures. In this work, we investigate the influence of the AGN disk photon field on neutrino emission within the internal dissipation regions of a two-component sGRB jet (a narrow core and a wide wing). We find that, due to the strong AGN disk photon field, the neutrino flux at high-energy part (e.g., PeV to EeV) will be suppressed, while the relatively lower-energy part (e.g., TeV to PeV) will be enhanced. Such a conclusion can enhance the constraints on GRB parameters (e.g., baryonic loading factor and bulk Lorentz factor) based on the future detection or non-detection of high-energy neutrinos from GRBs. Besides, the two-component jet can display two-bump structure at higher and lower energy in the neutrino spectrum. Therefore, the joint observations of electromagnetic and neutrinos emission can help us identify the sGRB jet and its structure in the AGN disk.