Work

On the Role of Slow Diffusion in Modeling Gamma-Ray Emission from the Cygnus bubble

Year: 2025

Type: conference-paper

Abstract: The PeV energy photons from the Cygnus bubble recently measured by LHAASO suggest that star clusters are among the population of sources called PeVatrons. In this work, we examine the capability of acceleration at the wind termination shock of Cygnus OB2. We find that spatially dependent Bohm diffusion downstream of the shock is favored to explain the observed gamma-ray spectrum, and that Galactic cosmic rays that have penetrated into the bubble contribute a significant fraction of the gamma-ray flux above $\sim$ 300 TeV. We also find that slow diffusion of nonthermal particles in a region extending to at least 150 pc from the center of the bubble is necessary to reproduce the measured gamma-ray morphologies. Our findings enable new insights into the physics of particle transport near astrophysical sources.

Source: International Cosmic Ray Conference

DOI: 10.22323/1.501.0067

Authors: Ben Li, Pasquale Blasi, Elena Amato

Institutions: Arcetri Astrophysical Observatory, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso, Gran Sasso Science Institute

Language: English

Topic: Astrophysics and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W4414419250

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