Presentation of Ph.D. Thesis

Nearly 40% of nearby galaxies host Low-luminosity Active Galactic Nuclei (LLAGNs), where supermassive black holes accrete matter at low rates. Despite their prevalence, LLAGNs are challenging to study due to their faintness, leaving many open questions about their behavior and impact on galaxy evolution. However, recent advances in observational capabilities have begun to unlock insights into these enigmatic systems. A key feature of LLAGNs is the presence of relativistic jets, similar to more luminous AGNs but operating at lower power. Understanding the properties of these jets is crucial for uncovering particle composition, and the processes driving particle acceleration and radiation across AGN luminosity scales. One of the crucial probes in studying jet characteristics is modeling their broadband emissions. I will show how leptonic models can explain observed broadband emissions of gamma-ray detected LLAGNs: NGC 1275, NGC 4486, NGC 315, and NGC 4261, through synchrotron and synchrotron self-Compton emission processes within jet regions at different scales. Furthermore, I will discuss another intriguing LLAGN M81*. The modeling for this case reveals similarities with high-synchrotron-peaked blazars and suggests a common jet mechanism across AGN luminosity scales. Finally, I will outline prospects for future research, including investigating lepto-hadronic models to constrain multi-wavelength emissions from LLAGNs.