Joint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2

dc.contributorAalto Universityen
dc.contributor.authorChamani, Wara
dc.contributor.authorKoljonen, Karri
dc.contributor.authorSavolainen, Tuomas
dc.contributor.departmentAnne Lähteenmäki Group
dc.contributor.departmentMetsähovi Radio Observatory
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.description.abstractDetecting and modeling the reprocessed hard X-ray emission component in the accretion flow, the so-called reflection spectrum, is a main tool used to estimate black hole spins in a wide range of astrophysical black holes, regardless of their mass or distance. In this work, we study the X-ray spectra of the Seyfert I galaxy III Zw 2 by using multiepoch XMM-Newton, NuSTAR, and Suzaku observations. The X-ray spectra exhibit a soft-excess below 1 keV and a prominent excess at the location of the broad FeKff line at 6.4 keV. To account for these spectral features, we fit the spectra with multiple models including an ionized partially covering absorber and an accretion disk reflection model. To fully resolve the reflection component, we analyzed jointly the XMM-Newton and NuSTAR observations taken in 2017 and archival XMM-Newton data from 2000. Assuming the reflection scenario, the resulting model fits support for a rapidly spinning black hole (a ≥ 0.98) in this radio-intermediate source. The X-ray spectra in 2000 and 2017 are remarkably similar; the only difference pertains to the reflection fraction, which is possibly due to a change in the geometry of the accretion flow. However, the Suzaku observation is markedly different, and we suggest this could be an effect of a jet contribution in the X-ray band, which is supported by the elevated radio flux during this observation.en
dc.description.versionPeer revieweden
dc.identifier.citationChamani , W , Koljonen , K & Savolainen , T 2020 , ' Joint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2 ' , Astronomy and Astrophysics , vol. 635 , A172 .
dc.identifier.otherPURE UUID: 8031d022-e652-410e-936e-4406cb36d368
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dc.publisherEDP SCIENCES
dc.relation.ispartofseriesAstronomy and Astrophysicsen
dc.relation.ispartofseriesVolume 635en
dc.subject.keywordAccretion disks
dc.subject.keywordBlack hole physics
dc.subject.keywordGalaxies: active
dc.subject.keywordGalaxies: Seyfert
dc.subject.keywordX-rays: galaxies
dc.titleJoint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2en
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi