Multiwavelength temporal and spectral analysis of Blazar S5 1803+78

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Priya S., Prince R., Agarwal A., Bose D., ÖZDÖNMEZ A., Ege E.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.513, no.2, pp.2239-2251, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 513 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1093/mnras/stac1009
  • Journal Name: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.2239-2251
  • Keywords: Galaxies: Active, BL Lacertae objects, galaxies: Jets, Gamma-rays Galaxies, X-rays Galaxies, MULTIBAND OPTICAL VARIABILITY, LARGE-AREA TELESCOPE, RELATIVISTIC JETS, COMPLETE SAMPLE, DOPPLER FACTORS, BROAD-BAND, RAY FLARE, 3C 279, X-RAY, RADIO
  • Istanbul University Affiliated: Yes

Abstract

Blazars are a class of AGN, one of their jets is pointed towards the earth. Here, we report about the multiwavelength study for blazar S5 1803+78 between MJD 58727 and MJD 59419. We analysed gamma-ray data collected by Fermi-LAI, X-ray data collected by Swift-XRT & NuSTAR, and optical photons detected by Swift-UVOT & TUBITAK observatory in Turkey. Three flaring states are identified by analysing the gamma-ray light curve. A day-scale variability is observed throughout the flares with the similar rise and decay times suggesting a compact emission region located close to the central engine. Cross-correlation studies are carried out between gamma-ray, radio, and X-ray bands, and no significant correlation is detected. The gamma-ray and optical emission are significantly correlated with zero time lag suggesting a co-spatial origin of them. The broad-band spectral energy distribution (SED) modelling was performed for all the flaring episodes as well as for one quiescent state for comparison. SEDs are best fitted with the synchrotron-self Compton (SSC) model under a one-zone leptonic scenario. The SED modelling shows that to explain the high flaring state, strong Doppler boosting is required.