Abstract Details
| Name: Susmita Das |
| Affiliation: Saha Institute of Nuclear Physics |
| Conference ID: ASI2026_32 |
| Title: Long-term Multiwavelength Study of the TeV blazar OP 313 in Low and Flaring States |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Susmita Das(Saha Institute of Nuclear Physics, Kolkata-700107, India), Suraj Shaw(Saha Institute of Nuclear Physics, Kolkata-700107, India), Chitranshi Bakshi(Saha Institute of Nuclear Physics, Kolkata-700107, India), Pratik Majumdar(Saha Institute of Nuclear Physics, Kolkata-700107, India), Ritaban Chatterjee(Presidency University, Kolkata-700073, India), Khushboo Sharma(ARIES, Nainital-263001, India), Anshika Gupta(ARIES, Nainital-263001, India), Kuntal Mishra(ARIES, Nainital-263001, India), Jagdish C. Joshi(ARIES, Nainital-263001, India) |
| Abstract: We present variability and spectral studies of the most distant TeV-detected blazar OP 313 (z = 0.997) at multiple wavebands from optical to GeV energies during 2019–25. The long-term light curves of this FSRQ contain several flaring phases with a remarkable very high energy flare (> 100 GeV) in December, 2023. The overall flux profile in GeV is better described by log-normal than Gaussian distribution and it shows a typical harder when brighter trend. We successfully model each flare by a double-exponential function which is asymmetric in shape in most cases. A stronger correlation is found between the variability at X-ray and Gev bands during the low flux epoch and there is significant change in the X-ray spectral shape from low to high state. Those suggest a different origin of X-ray emission in the high flux state. We carry out broadband SED modeling during the low flux and individual flares by multi-zones leptonic model considering synchrotron, Synchrotron self-Compton and external Compton emission processes. From the best-fit models, we compare the ongoing emission mechanisms, contributing emission regions and their parameters in various states of activity of the blazar. |