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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

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

691

Číslo periodika v rámci svazku

Nov.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

9

Strana od-do

A29

Kód UT WoS článku

001345759900021

EID výsledku v databázi Scopus

2-s2.0-85208286699