2023
DOI: 10.1093/mnras/stad1697
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Uncovering the geometry of the hot X-ray corona in the Seyfert galaxy NGC 4151 with IXPE

Abstract: We present an X-ray spectro-polarimetric analysis of the bright Seyfert galaxy NGC 4151. The source has been observed with the Imaging X-ray Polarimetry Explorer (IXPE) for 700 ks, complemented with simultaneous XMM-Newton (50 ks) and NuSTAR (100 ks) pointings. A polarization degree Π = 4.9 ± 1.1% and angle Ψ = 86○ ± 7○ east of north (68% confidence level) are measured in the 2–8 keV energy range. The spectro-polarimetric analysis shows that the polarization could be entirely due to reflection. Given the low r… Show more

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Cited by 41 publications
(14 citation statements)
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“…The energydependent values of PD and PA closely resemble the previous hard-state observations, showing a slight increase in PD with energy and a rather constant PA. Similar polarisation properties were also reported for the BHXRB Cyg X-1 in the hard state ) and for the nucleus of NGC 4151 (Gianolli et al 2023), indicating a common accretion geometry. The new results suggest that the optically thin Comptonising medium in the decaying hard state of Swift J1727.8−1613 is elongated in the accretion disc plane -perpendicular to the presumed timeaveraged radio jet direction in the rising hard state.…”
Section: Discussionsupporting
confidence: 84%
See 1 more Smart Citation
“…The energydependent values of PD and PA closely resemble the previous hard-state observations, showing a slight increase in PD with energy and a rather constant PA. Similar polarisation properties were also reported for the BHXRB Cyg X-1 in the hard state ) and for the nucleus of NGC 4151 (Gianolli et al 2023), indicating a common accretion geometry. The new results suggest that the optically thin Comptonising medium in the decaying hard state of Swift J1727.8−1613 is elongated in the accretion disc plane -perpendicular to the presumed timeaveraged radio jet direction in the rising hard state.…”
Section: Discussionsupporting
confidence: 84%
“…Poutanen & Svensson 1996;Ursini et al 2022;Krawczynski & Beheshtipour 2022). Analogous results for X-ray polarisation from a Comptonised power law were also reported for the active galactic nuclei NGC 4151 (Gianolli et al 2023) and IC 4329A (Ingram et al 2023) (Ingram et al 2024). The averaged 2-8 keV PD decreased monotonically from ∼ 4% to ∼ 3%.…”
mentioning
confidence: 52%
“…Owing to the three gas pixel detectors (GPDs; Costa et al 2001;Bellazzini et al 2003;Baldini et al 2021) in its focal plane, IXPE provides an unprecedented opportunity to measure the X-ray polarization of cosmic sources. Since its launch on 2021 December 9, IXPE has observed different types of AGNs (e.g., Ehlert et al 2022;Marinucci et al 2022;Gianolli et al 2023;Ingram et al 2023;Tagliacozzo et al 2023;Ursini et al 2023), including blazars (e.g., Liodakis et al 2022;Middei et al 2023). PG 1553+113 is one of several HSP blazars observed by IXPE.…”
Section: Introductionmentioning
confidence: 99%
“…Since the beginning of IXPE operation, three unobscured radio-quiet Seyfert 1 galaxies have been observed (NGC 4151: [78], IC 4329A: [79], and MCG-05-23-16: [80,81]). The X-ray polarization analysis for RQAGN was conducted using both model-independent and spectropolarimetric analysis methods.…”
Section: Ixpe Observations Of Unobscured Radio-quiet Agnmentioning
confidence: 99%