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The long term broadband spectral study of Flat Spectrum Radio Quasars duringdifferent flux states has the potential to infer the emission mechanisms andthe cause of spectral variations. To scrutinize this, we performed a detailedbroadband spectral analysis of 3C 279 using simultaneous Swift-XRT/UVOT andFermi-LAT observations spanning from August 2008 to June 2022. We alsosupplement this with the simultaneous NuSTAR observations of the source. Theoptical/UV, X-ray, and gamma-ray spectra were individually fitted by apower-law to study the long-term variation in the flux and the spectralindices. A combined spectral fit of simultaneous optical/UV and X-ray spectrawas also performed to obtain the transition energy at which the spectral energydistribution is minimum. The correlation analysis suggests that the long-termspectral variations of the source are mainly associated with the variations inthe low energy index and the break energy of the broken power-law electrondistribution which is responsible for the broadband emission. The fluxdistribution of the source represents a log-normal variability while thegamma-ray flux distribution showed a clear double log-normal behavior. Thespectral index distributions were again normal except for gamma-ray whichshowed a double-Gaussian behavior. This indicates that the log-normalvariability of the source may be associated with the normal variations in thespectral index. The broadband spectral fit of the source using synchrotron andinverse Compton processes indicates different emission processes are active atoptical/UV, X-ray, and gamma-ray energies.

Understanding the Broadband Emission Process of 3C 279 through Longterm Spectral Analysis