A second view on the X-ray polarization of NGC 4151 with IXPE

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00601309" target="_blank" >RIV/67985815:_____/24:00601309 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0358576" target="_blank" >https://hdl.handle.net/11104/0358576</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202451645" target="_blank" >10.1051/0004-6361/202451645</a>

Result language

angličtina

Original language name

A second view on the X-ray polarization of NGC 4151 with IXPE

Original language description

We report on the second observing program of the active galactic nucleus NGC 4151 with simultaneous Imaging X-ray Polarimetry Explorer (IXPE, 750 ks), NuSTAR (similar to 60 ks), XMM-Newton (similar to 75 ks), and NICER (similar to 65 ks) pointings. NGC 4151 is the first Type-1 radio-quiet Seyfert galaxy with constrained polarization properties for the X-ray corona. Despite the lower flux state in which the source was re-observed and the resulting higher contribution of the constant reflection component in the IXPE energy band, our results are in agreement with the first detection. From polarimetric analysis, a polarization degree Pi = 4.7 +/- 1.3% and polarization angle Psi = 77 degrees +/- 8 degrees east of north (68% c.l.) were derived in the 2.0-8.0 keV energy range. Combining the two observations leads to polarization properties that are more constrained than those of the individual detections, showing Pi = 4.5 +/- 0.9% and Psi = 81 degrees +/- 6 degrees (with a detection significance of similar to 4.6 sigma). The observed polarization angle aligns very well with the radio emission in this source, supporting, together with the significant polarization degree, a slab or wedge geometry for the X-ray corona. However, a switch in the polarization angle at low energies (37 degrees +/- 7 degrees in the 2-3.5 keV bin) suggests the presence of another component. When it is included in the spectro-polarimetric fit, a high polarization degree disfavors an interpretation in terms of a leakage through the absorbers, instead pointing to scattering from some kind of mirror.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

691

Issue of the periodical within the volume

Nov.

Country of publishing house

FR - FRANCE

Number of pages

9

Pages from-to

A29

UT code for WoS article

001345759900021

EID of the result in the Scopus database

2-s2.0-85208286699