Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 516, Issue 4, Pages 5907-5913Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac2634
Keywords
galaxies: active; galaxies: individual: MCG-05-23-16-polarization; galaxies: Seyfert
Categories
Funding
- National Aeronautics and Space Administration (NASA)
- Ball Aerospace [NNM15AA18C]
- Italian Space Agency (ASI) [ASI-OHBI-2017-12-I.0, ASI-INAF2017-12-H0, ASI-INFN-2017.13-H0]
- Istituto Nazionale di Astrofisica (INAF) in Italy
- Istituto Nazionale di Fisica Nucleare (INFN) in Italy
- Scientific Research National Center (CNRS)
- French spatial agency (CNES)
- GACR project [21-06825X]
- Spanish 'Ministerio de Ciencia e Innovacion' (MCINN) through the 'Center of Excellence Severo Ochoa' award [SEV-2017-0709]
- Spanish 'Ministerio de Ciencia e Innovacion' (MCINN) [AYA2016-80889-P, PID2019-107847RB-C44]
- [RVO:67985815]
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We report the first observation of a radio-quiet active galactic nucleus (AGN) in polarized X-rays, which was observed in the Seyfert 1.9 galaxy MCG-05-23-16. The analysis of the observation data revealed some characteristics of this phenomenon, such as the polarization degree and the broad-band spectrum. Comparisons with simulations further enhance our understanding of this phenomenon.
We report on the first observation of a radio-quiet active galactic nucleus (AGN) in polarized X-rays: the Seyfert 1.9 galaxy MCG-05-23-16. This source was pointed at with the Imaging X-ray Polarimetry Explorer (IXPE) starting on 2022 May 14 for a net observing time of 486 ks, simultaneously with XMM-Newton (58 ks) and NuSTAR (83 ks). A polarization degree pi smaller than 4.7 per cent (at the 99 per cent confidence level) is derived in the 2-8 keV energy range, where emission is dominated by the primary component ascribed to the hot corona. The broad-band spectrum, inferred from a simultaneous fit to the IXPE, NuSTAR, and XMM-Newton data, is well reproduced by a power law with photon index Gamma = 1.85 +/- 0.01 and a high-energy cutoff E-C = 120 +/- 15 keV. A comparison with Monte Carlo simulations shows that a lamp-post and a conical geometry of the corona are consistent with the observed upper limit, a slab geometry is allowed only if the inclination angle of the system is less than 50 degrees.
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