J 2022

X-ray timing and spectral variability properties of blazars S5 0716+714, OJ 287, Mrk 501, and RBS 2070

MOHORIAN, Maksym, Gopal BHATTA, Tek P ADHIKARI, Niraj DHITAL, Radim PÁNIS et. al.

Základní údaje

Originální název

X-ray timing and spectral variability properties of blazars S5 0716+714, OJ 287, Mrk 501, and RBS 2070

Autoři

MOHORIAN, Maksym, Gopal BHATTA, Tek P ADHIKARI, Niraj DHITAL, Radim PÁNIS (703 Slovensko, domácí), Adithiya DINESH, Suvas C CHAUDHARY, Rajesh K BACHCHAN a Zdeněk STUCHLÍK (203 Česká republika, domácí)

Vydání

Monthly Notices of the Royal Astronomical Society, 2022, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Kód RIV

RIV/47813059:19630/22:A0000230

Organizační jednotka

Fyzikální ústav v Opavě

UT WoS

000764893500006

Klíčová slova anglicky

accretion; accretion discs; radiation mechanisms: non-thermal; methods: data analysis; BL Lacertae objects: individual: RBS 2070 OJ 287 and Mrk 501 and S5 0716+714-X-rays: galaxies

Příznaky

Mezinárodní význam, Recenzováno

Návaznosti

EF19_073/0016951, projekt VaV.
Změněno: 1. 2. 2023 13:36, Mgr. Pavlína Jalůvková

Anotace

V originále

The X-ray emission from blazars has been widely investigated using several space telescopes. In this work, we explored statistical properties of the X-ray variability in the blazars S5 0716+714, OJ 287, Mkn 501, and RBS 2070 using the archival observations from the XMM-Newton telescope between the period 2002-2020. Several methods of timing and spectral analyses, including fractional variability, minimum variability time-scale, power spectral density analyses, and countrate distribution, were performed. In addition, we fitted various spectral models to the observations, as well as estimated hardness ratio. The results show that the sources are moderately variable within the intraday time-scale. Three of the four sources exhibited a clear bi-modal pattern in their countrate distribution, revealing possible indication of two distinct countrate states, that is, hard and soft countrate states. The slope indices of the power spectral density were found to be centred around 0.5. Furthermore, the spectra of the sources were fitted with single power law, broken power law, log-parabolic, and blackbody + log-parabolic models (the latter only for OJ 287). We conclude that for most of the observations log-parabolic model was the best fit. The power-spectral-density analysis revealed the variable nature of PSD slopes in the source light curves. The results of this analysis could indicate the non-stationary nature of the blazar processes on intraday time-scales. The observed features can be explained within the context of current blazar models, in which the non-thermal emission mostly arises from kilo-pc scale relativistic jets.