Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8334
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dc.contributor.authorPal, Indrani-
dc.contributor.authorStalin, C. S-
dc.contributor.authorChatterjee, Rwitika-
dc.contributor.authorAgrawal, Vivek K-
dc.date.accessioned2024-01-11T05:23:18Z-
dc.date.available2024-01-11T05:23:18Z-
dc.date.issued2023-12-
dc.identifier.citationJournal of Astrophysics and Astronomy, Vol. 44, No. 2, 87en_US
dc.identifier.issn0973-7758-
dc.identifier.urihttp://hdl.handle.net/2248/8334-
dc.descriptionRestricted Accessen_US
dc.descriptionThe original publication is available at springerlink.com-
dc.description.abstractX-ray polarimetry is a powerful tool to probe the geometry of the hot X-ray corona in active galactic nuclei (AGN). Here, we present our results on the characterisation of the X-ray polarization of the radio-quiet Seyfert-type AGN IC 4329A at a redshift of 𝑧 = 0.016. This is based on observations carried out by the Imaging X-ray Polarimeter (IXPE). IXPE observed IC 4329A on January 5, 2023, for a total observing time of 458 ks. From the model-independent analysis, we found a polarization degree (Π𝑋) of 3.7Β±1.5% and a polarization position angle (Ψ𝑋) of 61β—¦Β±12β—¦ in the 2βˆ’8 keV energy range (at 1𝜎 confidence level). This is also in agreement with the values of Π𝑋 and Ψ𝑋 of 4.7Β±2.2% and 71β—¦ Β±14β—¦ respectively obtained from spectro-polarimetric analysis of the I, Q and U Stokes spectra in the 2βˆ’8 keV energy band (at the 90% confidence). The value of Π𝑋 in the 2-8 keV band obtained from the model-independent analysis is lower than the minimum detectable polarization (MDP) value of 4.5%. However, Π𝑋 obtained from spectro-polarimetric analysis in the 2-8 keV band is larger than the MDP value. In the 3-5 keV band, we found Π𝑋 of 6.5 Β± 1.8, which is larger than the MDP value of 5.5%. The observed moderate value of Π𝑋 obtained from the analysis of the IXPE data in the 3βˆ’5 keV band argues against a spherical lampβˆ’post geometry for the X-ray corona in IC 4329A; however, considering simulations, the observed polarization measurements tend to favour a conical shape geometry for the corona. This is the first time measurement of X-ray polarization in IC 4329A. Measurements of the X-ray polarization in many such radio-quiet AGN will help in constraining the geometry of the X-ray corona in AGN.en_US
dc.language.isoenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.urihttps://doi.org/10.1007/s12036-023-09981-5-
dc.rightsΒ© Indian Academy of Sciences-
dc.subjectGalaxies:activeen_US
dc.subjectGalaxies:Seyferten_US
dc.subjectIndividual:IC 4329Aen_US
dc.titleX-ray polarization observations of IC 4329A with IXPE: Constraining the geometry of the X-ray coronaen_US
dc.typeArticleen_US
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