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Article: A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375

TitleA polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375
Authors
KeywordsMagnetic fields
Polarization
Pulsars: individual: EXO 2030+375
Stars: neutron
X-rays: binaries
Issue Date30-Jun-2023
PublisherEDP Sciences
Citation
Astronomy & Astrophysics, 2023, v. 675, p. 1-10 How to Cite?
AbstractAccreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected to polarize the emission up to a polarization degree of similar to 80%. However, such expectations are being challenged by recent observations of XRPs with the Imaging X-ray Polarimeter Explorer (IXPE). Here, we report on the results of yet another XRP, namely, EXO 2030+375, observed with IXPE and contemporarily monitored with Insight-HXMT and SRG/ART-XC. In line with recent results obtained with IXPE for similar sources, an analysis of the EXO 2030+375 data returns a low polarization degree of 0%-3% in the phase-averaged study and a variation in the range of 2%-7% in the phase-resolved study. Using the rotating vector model, we constrained the geometry of the system and obtained a value of similar to 60 degrees for the magnetic obliquity. When considering the estimated pulsar inclination of similar to 130 degrees, this also indicates that the magnetic axis swings close to the observer's line of sight. Our joint polarimetric, spectral, and timing analyses hint toward a complex accreting geometry, whereby magnetic multipoles with an asymmetric topology and gravitational light bending significantly affect the behavior of the observed source.
Persistent Identifierhttp://hdl.handle.net/10722/331849
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 1.896
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMalacaria, C-
dc.contributor.authorHeyl, J-
dc.contributor.authorDoroshenko, V-
dc.contributor.authorTsygankov, SS-
dc.contributor.authorPoutanen, J-
dc.contributor.authorForsblom, SV-
dc.contributor.authorCapitanio, F-
dc.contributor.authorDi Marco, A-
dc.contributor.authorDu, YJ-
dc.contributor.authorDucci, L-
dc.contributor.authorLa Monaca, F-
dc.contributor.authorLutovinov, AA-
dc.contributor.authorMarshall, HL-
dc.contributor.authorMereminskiy, IA-
dc.contributor.authorMolkov, SV-
dc.contributor.authorMushtukov, AA-
dc.contributor.authorNg, M-
dc.contributor.authorPetrucci, PO-
dc.contributor.authorSantangelo, A-
dc.contributor.authorShtykovsky, AE-
dc.contributor.authorSuleimanov, VF-
dc.contributor.authorAgudo, I-
dc.contributor.authorAntonelli, LA-
dc.contributor.authorBachetti, M-
dc.contributor.authorBaldini, L-
dc.contributor.authorBaumgartner, WH-
dc.contributor.authorNg, CY-
dc.contributor.authoret al-
dc.date.accessioned2023-09-28T04:59:05Z-
dc.date.available2023-09-28T04:59:05Z-
dc.date.issued2023-06-30-
dc.identifier.citationAstronomy & Astrophysics, 2023, v. 675, p. 1-10-
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/10722/331849-
dc.description.abstractAccreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected to polarize the emission up to a polarization degree of similar to 80%. However, such expectations are being challenged by recent observations of XRPs with the Imaging X-ray Polarimeter Explorer (IXPE). Here, we report on the results of yet another XRP, namely, EXO 2030+375, observed with IXPE and contemporarily monitored with Insight-HXMT and SRG/ART-XC. In line with recent results obtained with IXPE for similar sources, an analysis of the EXO 2030+375 data returns a low polarization degree of 0%-3% in the phase-averaged study and a variation in the range of 2%-7% in the phase-resolved study. Using the rotating vector model, we constrained the geometry of the system and obtained a value of similar to 60 degrees for the magnetic obliquity. When considering the estimated pulsar inclination of similar to 130 degrees, this also indicates that the magnetic axis swings close to the observer's line of sight. Our joint polarimetric, spectral, and timing analyses hint toward a complex accreting geometry, whereby magnetic multipoles with an asymmetric topology and gravitational light bending significantly affect the behavior of the observed source.-
dc.languageeng-
dc.publisherEDP Sciences-
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectMagnetic fields-
dc.subjectPolarization-
dc.subjectPulsars: individual: EXO 2030+375-
dc.subjectStars: neutron-
dc.subjectX-rays: binaries-
dc.titleA polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1051/0004-6361/202346581-
dc.identifier.scopuseid_2-s2.0-85164539143-
dc.identifier.volume675-
dc.identifier.spage1-
dc.identifier.epage10-
dc.identifier.eissn1432-0746-
dc.identifier.isiWOS:001023752300009-
dc.publisher.placeLES ULIS CEDEX A-
dc.identifier.issnl0004-6361-

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