Gamma-ray flares from the jet of the blazar CTA 102 in 2016-2018

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646367" target="_blank" >RIV/67985815:90106/25:00646367 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/0004-6361/202450003" target="_blank" >https://doi.org/10.1051/0004-6361/202450003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202450003" target="_blank" >10.1051/0004-6361/202450003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Gamma-ray flares from the jet of the blazar CTA 102 in 2016-2018

Popis výsledku v původním jazyce

CTA 102 is a gamma-ray bright blazar that exhibited multiple flares in observations by the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope during the period of 2016-2018. We present results from the analysis of multi-wavelength light curves with the aim of revealing the nature of gamma-ray flares from the relativistic jet in the blazar. We analysed radio, optical, X-ray, and gamma-ray data obtained in a period from 2012 September 29 to 2018 October 8. We identified six flares in the gamma-ray light curve, showing a harder-when-brighter trend in the gamma-ray spectra. We performed a cross-correlation analysis of the multi-wavelength light curves. We found nearly zero time lags between the gamma-ray and optical and X-ray light curves, implying a common spatial origin for the emission in these bands. We found significant correlations between the gamma-ray and radio light curves as well as negative or positive time lags with the gamma-ray emission lagging or leading the radio during different flaring periods. The time lags between the gamma-ray and radio emission propose the presence of multiple gamma-ray emission sites in the source. As seen in 43 GHz images from the Very Long Baseline Array, two moving disturbances (or shocks) were newly ejected from the radio core. The gamma-ray flares from 2016 to 2017 are temporally coincident with the interaction between a travelling shock and a quasi-stationary one at similar to 0.1 mas from the core. The other shock was found to have emerged from the core nearly simultaneously with the gamma-ray flare in 2018. Our results suggest that the gamma-ray flares originated from shock-shock interactions.

Název v anglickém jazyce

Gamma-ray flares from the jet of the blazar CTA 102 in 2016-2018

Popis výsledku anglicky

CTA 102 is a gamma-ray bright blazar that exhibited multiple flares in observations by the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope during the period of 2016-2018. We present results from the analysis of multi-wavelength light curves with the aim of revealing the nature of gamma-ray flares from the relativistic jet in the blazar. We analysed radio, optical, X-ray, and gamma-ray data obtained in a period from 2012 September 29 to 2018 October 8. We identified six flares in the gamma-ray light curve, showing a harder-when-brighter trend in the gamma-ray spectra. We performed a cross-correlation analysis of the multi-wavelength light curves. We found nearly zero time lags between the gamma-ray and optical and X-ray light curves, implying a common spatial origin for the emission in these bands. We found significant correlations between the gamma-ray and radio light curves as well as negative or positive time lags with the gamma-ray emission lagging or leading the radio during different flaring periods. The time lags between the gamma-ray and radio emission propose the presence of multiple gamma-ray emission sites in the source. As seen in 43 GHz images from the Very Long Baseline Array, two moving disturbances (or shocks) were newly ejected from the radio core. The gamma-ray flares from 2016 to 2017 are temporally coincident with the interaction between a travelling shock and a quasi-stationary one at similar to 0.1 mas from the core. The other shock was found to have emerged from the core nearly simultaneously with the gamma-ray flare in 2018. Our results suggest that the gamma-ray flares originated from shock-shock interactions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

694

Číslo periodika v rámci svazku

Feb.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

14

Strana od-do

A291

Kód UT WoS článku

001426864800002

EID výsledku v databázi Scopus

2-s2.0-85219563260