INTER-UNIVERSITY CENTRE FOR ASTRONOMY AND ASTROPHYSICS
(An Autonomous Institution of the University Grants Commission)
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SEMINAR
Ms. Gunjan Tomar |
Ph.D. Student, Raman Research Institute, Bangalore |
High-Energy Observations of Low-Luminosity Active Galactic Nuclei |
In the nearby universe, low-luminosity active galactic nuclei (LLAGNs) dominate, which are characterized by their low accretion rates and often misaligned jets. Due to their faintness, the high-energy (HE) properties of these sources remain less explored than those of their brighter counterparts. Multi-wavelength observations of their jets serve as a crucial probe into the physical mechanisms in these extreme environments. Recent advancements in gamma-ray observations by Fermi-LAT have significantly improved our understanding. I will present a detailed broadband study of two recently identified gamma-ray emitters, NGC 315 and NGC 4261, which hints at the presence of extended gamma-ray emissions, previously only known in two bright radio galaxies. Additionally, I will discuss temporal SED variations in another LLAGN, M81*, which shows behavior similar to high-synchrotron-peaked blazars, suggesting a potential universal jet mechanism across AGN luminosities. Finally, I will touch on our recent very high energy (VHE; >100 GeV) detections of a few more radio galaxies expanding the sample of misaligned VHE emitters despite modest Doppler boosting, and conclude with insights on their implications for VHE emission processes and AGN jet physics. |
IUCAA Lecture Hall, Bhaskara 3 |
November 12, 2024, 16:00 hrs. |