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Disk-Corona Energy Balance Evolves with Flux State in the Quasar PDS 456
Fida Fathima S S, Arijit Sar, Tathagata Saha +1
We investigate the long-term X-ray spectral evolution of the highly luminous, radio-quiet quasar PDS 456 using AstroSat observations obtained in 2019 and 2021 together with archiva…
Dynamic Accretion Disk-Corona Connection and Broad Fe K Variability in Mrk 766 Revealed by Time-Resolved High Resolution X-Ray Spectroscopic Analysis
Ayon Mondal, Tathagata Saha, Arijit Sar +1
We present a multi-epoch, primarily X-ray study of the narrow-line Seyfert 1 (NLSy1) galaxy Mrk~766 by combining archival \textit{XMM-Newton} observations spanning nearly two decad…
Spectral Energy Distribution Modeling of BL Lacertae During a Large Submillimeter Outburst and Low X-Ray Polarization State
Ayon Mondal, Arijit Sar, Maitreya Kundu +2
In 2023 October-November, the blazar BL Lacertae underwent a very large-amplitude submm outburst. The usual single-zone leptonic model with the lower energy peak of the spectral en…