59 citations · 177 across the 36 of their papers we have counts for
9 papers · 1 filter
Possibility of Month-scale Quasi-periodic Oscillations in the Gamma-ray Light Curve of OP 313
Sandeep Kumar Mondal, Shubham Kishore, Alok C. Gupta +1
In this work, we report evidence suggesting the potential future detection of a month-scale quasi-periodic oscillation (QPO) in the gamma-ray light curve of OP 313. We analysed alm…
Identifying the secondary jet in the RadioAstron image of OJ~287
Mauri J. Valtonen, Lankeswar Dey, Staszek Zola +26
The 136 year long optical light curve of OJ~287 is explained by a binary black hole model where the secondary is in a 12 year orbit around the primary. Impacts of the secondary on…
A Disk-Originated 329-day Quasi-Periodic Oscillation in the Seyfert 1 Galaxy J1626+5120
Litao Zhu, Zhongxiang Wang, Dong Zheng +2
The Seyfert 1 galaxy J1626+5120 is estimated to host a black hole (BH) accreting at Eddington ratio . Its long-term multi-band…
AT2022sxl: A Candidate Repeating Tidal Disruption Event in Possible Association with Two High-Energy Neutrino Events
Shunhao Ji, Zhongxiang Wang, Litao Zhu +2
We report a candidate repeating tidal disruption event (TDE), AT2022sxl, found from large-field optical survey data. Two flares with a separation time of 7.2\,yr between the…
Multi-band optical variability of the blazar OP 313 in the outburst state during 2024-2025
P. U. Devanand, Alok C. Gupta, Karan Dogra +2
We present the analysis results of flux and spectral variability of the blazar OP 313 across intra-night to short-term timescales using BVRI photometric data, gathered over 25 nigh…
Modeling the Multiwavelength Emission of 3C 279 during the 14 years of Fermi-LAT Era
Krishna Mohana A, Alok C. Gupta, Junhui Fan +7
We report the results of our long-term multiwavelength spectral energy distribution (SED) study on the flat spectrum radio quasar 3C 279 during the years (2008--2022) of {…