| Name: | Shruti Mukherjee |
| Affiliation: | Indian Institute of Technology Indore |
| Conference ID : | ASI2024_917 |
| Title : | Study the long-term temporal & spectral behavior of FSRQ 4C+01.02 |
| Authors : | Shruti Mukherjee1, Sushmita Agarwal1, Amit Shukla1 |
| Authors Affiliation: | 1 Indian Institute of Technology, Indore-452020, India |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Blazars located at significant redshifts represent some of the most potent and variable sources in the cosmos. The precise origin, location and underlying processes governing the intense γ-ray variability from FSRQs remain elusive. In this work we present a detailed long-term temporal and spectral analysis of the High energy (HE) γ-ray flux of FSRQ 4C+01.02 at a redshift z ~ 2.099 with Fermi-LAT during its first 15 years of operation. During October 2021–September 2023, the source had a prolonged state of increased activity spanning the entire observed electromagnetic spectrum. The one-day bin HE γ-ray lightcurve of Fermi-LAT observed a flux of ~ 4 x 10^-6 ph/cm^2 s at energies above 100 MeV on 2022 August 9. By focusing on major flares detected with Bayesian blocks and the hop algorithm, we discern sub-hour scale variability, indicative of extremely compact emission regions within the jet, possibly associated with the BLR region. Following the γ-ray bright state, we triggered X-ray observations of the source with Swift-XRT from September 1, 2022 to September 2, 2022 in the PC mode for a net exposure of 1.1 ks. The ToO observation suggests that the source is in the bright state, with the highest reported X-ray (0.3 -10 keV) flux at 4.21 x 10^-12 erg/cm^2 s on September 1, 2022. The power law spectral index during this observation is 1.43. With the ongoing Swift-XRT activity, we intend to present a multiwavelength study of 4C+01.02. |
