| Name: Megha Bansal |
| Affiliation: Indian Institute of Science Education and Research, Mohali |
| Conference ID: ASI2026_644 |
| Title: Understanding VHE emission in FSRQs and LBLs/IBLs: SED Peak Shifts and Their Implications |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Megha(Indian Institute of Science Education and Research, Mohali - 140306, India), Pankaj Kushwaha(Indian Institute of Science Education and Research, Mohali - 140306, India) |
| Abstract: Blazars are radio-loud AGN having strong relativistic jets pointed towards the observer, characterized by non-thermal emission, polarization, strong variability, and double-humped broadband SED. Very high energy (VHE; E≳100 GeV) gamma-ray emission from blazars is a powerful tool to probe radiative and particle acceleration processes in relativistic jets.
In this talk, we present our systematic study of 10 FSRQs detected at VHE, focusing on comparing their spectral behavior during various activity states, such as low- and high-flux states, as well as during the reported VHE behavior and the entire Fermi duration. Our analysis revealed that VHE is associated with brighter flux states and a generally harder spectrum. The MeV-GeV peak shows no to minimal to significant peak upshifts during high and VHE states, and the upshift is more prominent with increasing redshift. We interpret these trends as primarily driven by the extension of the particle spectrum to higher energies, aided by spectral transitions or the emergence of an additional HBL-type component in some cases.
Following this, we extended our study to VHE-detected LBL/IBL sources. Interestingly, we find a subset of sources exhibiting peak shifts and spectral evolution, while others display more complex behaviors. These results highlight both the similarities and differences, which will be discussed during the talk.
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