Multiwavelength temporal and spectral study of TeV blazar 1ES 1727+502 during 2014 to 2021

TL;DR

This study analyzes the long-term multiwavelength variability and spectral energy distribution of the TeV blazar 1ES 1727+502 from 2014 to 2021, revealing complex emission behaviors and modeling the broadband spectrum with a one-zone SSC model.

Contribution

It provides a detailed long-term multiwavelength analysis and applies a one-zone SSC model to fit the broadband SED across different flux states of the blazar.

Findings

Brightest X-ray flaring episode observed

Variability timescales range from days to months

Broadband SED can be modeled with one-zone SSC

Abstract

One of the most important questions in blazar physics is the origin of broadband emission and fast-flux variation. In this work, we studied the broadband temporal and spectral properties of a TeV blazar 1ES 1727+502 and explore the one-zone synchrotron-self Compton (SSC) model to fit the broadband spectral energy distribution (SED). We collected the long-term (2014-2021) multiband data which includes both the low and high flux states of the source. The entire light curve is divided into three segments of different flux states and the best-fit parameters obtained by broadband SED modeling corresponding to three flux states were then compared. The TeV blazar 1ES 1727+502 has been observed to show the brightest flaring episode in X-ray followed by optical-UV and gamma-ray. The fractional variability estimated during various segments behaves differently in multiple wavebands, suggesting a complex nature of emission in this source. This source has shown a range of variability time from days scale to month scale during this long period of observations between 2014-2021. A "harder-when-brighter" trend is not prominent in X-ray but seen in optical-UV and an opposite trend is observed in gamma-ray. The complex nature of correlation among various bands is observed. The SED modeling suggests that the one-zone SSC emission model can reproduce the broadband spectrum in the energy range from optical-UV to very high energy gamma-ray.