Magnetic field properties inside the jet of Mrk 421

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00582090" target="_blank" >RIV/67985815:_____/24:00582090 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0353268" target="_blank" >https://hdl.handle.net/11104/0353268</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202347408" target="_blank" >10.1051/0004-6361/202347408</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetic field properties inside the jet of Mrk 421

Popis výsledku v původním jazyce

We aim to probe the magnetic field geometry and particle acceleration mechanism in the relativistic jets of supermassive black holes.Methods. We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging X-ray Polarimetry Explorer (IXPE) measurements from 2022 December 6-8. During the IXPE observation, we also monitored Mrk 421 using Swift-XRT and obtained a single observation with XMM-Newton to improve the X-ray spectral analysis. The time-averaged X-ray polarization was determined consistently using the event-by-event Stokes parameter analysis, spectropolarimetric fit, and maximum likelihood methods. We examined the polarization variability over both time and energy, the former via analysis of IXPE data obtained over a time span of 7 months.Results. We detected X-ray polarization of Mrk 421 with a degree of Pi(X) = 14 +/- 1% and an electric-vector position angle psi(X) = 107 +/- 3 degrees in the 2-8 keV band. From the time variability analysis, we find a significant episodic variation in psi(X). During the 7 months from the first IXPE pointing of Mrk 421 in 2022 May, psi(X) varied in the range 0 degrees to 180 degrees, while Pi(X) remained relatively constant within similar to 10-15%. Furthermore, a swing in psi(X) in 2022 June was accompanied by simultaneous spectral variations.

Název v anglickém jazyce

Magnetic field properties inside the jet of Mrk 421

Popis výsledku anglicky

We aim to probe the magnetic field geometry and particle acceleration mechanism in the relativistic jets of supermassive black holes.Methods. We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging X-ray Polarimetry Explorer (IXPE) measurements from 2022 December 6-8. During the IXPE observation, we also monitored Mrk 421 using Swift-XRT and obtained a single observation with XMM-Newton to improve the X-ray spectral analysis. The time-averaged X-ray polarization was determined consistently using the event-by-event Stokes parameter analysis, spectropolarimetric fit, and maximum likelihood methods. We examined the polarization variability over both time and energy, the former via analysis of IXPE data obtained over a time span of 7 months.Results. We detected X-ray polarization of Mrk 421 with a degree of Pi(X) = 14 +/- 1% and an electric-vector position angle psi(X) = 107 +/- 3 degrees in the 2-8 keV band. From the time variability analysis, we find a significant episodic variation in psi(X). During the 7 months from the first IXPE pointing of Mrk 421 in 2022 May, psi(X) varied in the range 0 degrees to 180 degrees, while Pi(X) remained relatively constant within similar to 10-15%. Furthermore, a swing in psi(X) in 2022 June was accompanied by simultaneous spectral variations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

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

681

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

17

Strana od-do

A12

Kód UT WoS článku

001137087100006

EID výsledku v databázi Scopus

2-s2.0-85182029598