Multiwavelength Properties of Selected High Redshift Blazars

Pub Date : 2023-07-31 DOI:10.1007/s10511-023-09780-4

G. Harutyunyan

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Abstract

High-redshift blazars detected in the γ -ray band are the most powerful steady objects in the universe. Multiwavelength observations of these distant objects are of particular interest as they can help to understand the γ -ray evolution of blazars as well as the formation and propagation of relativistic jets in the early epochs of the Universe. In this study, we investigate the origin of broadband emission from 7 blazars with redshifts greater than 2.5 by analyzing the data accumulated with Swift UVOT/XRT and Fermi-LAT. We observe several flaring periods with significant increases in flux and hardening of the photon index in the high-energy γ -ray band for PKS 1830-211 (z = 2.507), LQAC 247-061 (z = 2.578), TXS 0536+145 (z = 2.690), and 4C+41.32 (z = 2.550). PKS 1830-211 was in an extraordinarily bright state on MJD 58596.49 when the 3-day averaged flux increased up to (1.74 ± 0.04)·10^–5 photon cm^-2 s^-1. The X-ray emission of PKS 1830-211 is also strongly variable and is characterized by a hard photon index in the range of 0.34-0.94. To model the time-averaged broadband spectral energy distribution of the considered sources, we used a one-zone leptonic emission mechanism for the inverse Compton scattering, considering both synchrotron and external photons. We estimated the corresponding parameters of the emitting particles as well as the energetics of the jet.

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高红移耀变体的多波长特性

在γ射线波段探测到的高红移耀变体是宇宙中最强大的稳定物体。对这些遥远天体的多波长观测是特别有趣的，因为它们可以帮助理解耀变体的γ射线演化，以及宇宙早期相对论性喷流的形成和传播。本研究通过分析Swift UVOT/XRT和Fermi-LAT积累的数据，研究了7颗红移大于2.5的blazar的宽带发射来源。我们观察到PKS 1830-211 (z = 2.507)、LQAC 247-061 (z = 2.578)、TXS 0536+145 (z = 2.690)和4C+41.32 (z = 2.550)的几个耀斑期，它们的高能γ射线波段的通量和光子指数显著增加。PKS 1830-211在MJD 58596.49上处于异常明亮的状态，3天平均通量增加到(1.74±0.04)·10-5光子cm-2 s-1。PKS 1830-211的x射线发射也有很强的变化，其硬光子指数在0.34-0.94之间。为了模拟所考虑的源的时间平均宽带光谱能量分布，我们使用了一个单区轻子发射机制来进行逆康普顿散射，同时考虑了同步加速器和外部光子。我们估计了发射粒子的相应参数以及射流的能量学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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