Kavli Affiliate: Aaron Roodman
| Summary:
The Unresolved $γ$-Ray Background (UGRB) encodes the collective emission of source populations that are too faint to be detected individually, and its cross-correlation with tracers of the large-scale structure has emerged as a powerful tool to characterize those populations. In this work, we analyze the weak-lensing–UGRB cross-correlation using a reference blazar model. By modeling the relation between blazar $γ$-ray luminosity and host-halo mass, we infer the average linear bias $langle b(z) rangle$ and host-halo mass $langle M(z) rangle$ of the unresolved blazar population. We find that the signal is dominated by moderately biased sources, with $langle b rangle gtrsim 2$ at $zsimeq 1$, hosted by halos with $langle M rangle sim mathcalO(10^13,M_odot)$. Repeating the analysis with a misaligned-AGN model yields consistent bias values, indicating that the result is determined by the clustering properties of the UGRB rather than by the details of the $γ$-ray source model.
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