Pre-submission Thesis Presentation by Gunjan Tomar

Pre-submission Thesis Presentation

Radiating Insights: A Multi-wavelength Study of Low-Luminosity Active Galactic Nuclei Jets

Speaker: Gunjan Tomar (Raman Research Institute )

तिथि और समय
कार्यक्रम का स्थान
Library Block Lecture Hall

अमूर्त

Nearly 40% of nearby galaxies are home to Low-luminosity Active Galactic Nuclei (LLAGNs), where supermassive black holes feed at low rates. Despite their prevalence, LLAGNs remain challenging to study due to their faintness, leaving many questions unanswered. However, recent advancements in observational capabilities have enabled a comprehensive analysis. I will provide an overview of LLAGNs, focusing on the jets of these systems, and compare them with more luminous AGNs. 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, such as 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.