Magnetic field properties inside the jet of Mrk 421
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Magnetic field properties inside the jet of Mrk 421
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
681
Issue of the periodical within the volume
January
Country of publishing house
FR - FRANCE
Number of pages
17
Pages from-to
A12
UT code for WoS article
001137087100006
EID of the result in the Scopus database
2-s2.0-85182029598