The provided diagram illustrates a Hybrid MQ Architecture. This model integrates both centralized and decentralized messaging patterns within the same system.

Some components (Applications 2, 3, and 5) are shown in a decentralized, container-style pattern, each with its own dedicated MQ queue manager. This provides agility and isolation for modern, microservices-based applications.

Simultaneously, a large, shared MQ instance serves as a central messaging backbone. This centralized component is used by other applications (like Application 4) and also facilitates communication between the newer decentralized applications and legacy systems. This hybrid approach is common in enterprises that are progressively modernizing from a monolithic architecture to a microservices-based one.

IBM Redbooks Publication: Application Modernization with IBM MQ, SG24-8483-00. Chapter 2, "Architectural evolution and modernization patterns," discusses how enterprises evolve from traditional, centralized messaging topologies to modern, agile ones. It describes scenarios where new, containerized MQ deployments for microservices coexist and integrate with an established, centralized MQ infrastructure, creating a hybrid environment.

Newman, S. (2019). Monolith to Microservices: Evolutionary Patterns to Transform Your Monolith. O'Reilly Media. Chapter 4, "Splitting the Monolith," describes migration strategies where new microservices are created alongside a legacy monolith. The resulting communication patterns often create a hybrid topology, where new services use decentralized messaging while still needing to connect back to a central enterprise service bus (ESB) or message broker.

Richards, M. (2020). Fundamentals of Software Architecture: An Engineering Approach. O'Reilly Media. The book contrasts broker-based (centralized) and brokerless (decentralized) messaging topologies, noting that in real-world systems, hybrid models are often implemented to leverage the benefits of both patterns or to accommodate architectural transitions.