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dc.contributor.authorMora-Partiarroyo, Silvia Carolina
dc.contributor.authorKrause, Marita
dc.contributor.authorBasu, Aritra
dc.contributor.authorBeck, Rainer
dc.contributor.authorWiegert, Theresa
dc.contributor.authorIrwin, Judith
dc.contributor.authorHenriksen, Richard
dc.contributor.authorStein, Yelena
dc.contributor.authorVargas, Carlos J.
dc.contributor.authorHeesen, Volker
dc.contributor.authorWalterbos, René A. M.
dc.contributor.authorRand, Richard J.
dc.contributor.authorHeald, George
dc.contributor.authorLi, Jiangtao
dc.contributor.authorKamieneski, Patrick
dc.contributor.authorEnglish, Jayanne
dc.date.accessioned2020-02-04T18:02:49Z
dc.date.available2020-02-04T18:02:49Z
dc.date.issued2019-11-26
dc.identifier.citationMora-Partiarroyo, S. C., Krause, M., Basu, A., Beck, R., Wiegert, T., Irwin, J., … English, J. (2019). CHANG-ES. Astronomy & Astrophysics, 632, A11. https://doi.org/10.1051/0004-6361/201935961 ‌en_US
dc.identifier.issn0004-6361
dc.identifier.doi10.1051/0004-6361/201935961
dc.identifier.urihttp://hdl.handle.net/10150/636895
dc.description.abstractAims. NGC4631 is an interacting galaxy which exhibits one of the largest gaseous halos observed among edge-on galaxies. We aim to examine the synchrotron and polarization properties of its disk and halo emission with new radio continuum data. Methods. Radio continuum observations of NGC4631 were performed with the Karl G. Jansky Very Large Array at C-band (5.99 GHz) in the C and D array configurations, and at L-band (1.57 GHz) in the B, C, and D array configurations. The Rotation Measure Synthesis algorithm was utilized to derive the polarization properties. Results. We detected linearly polarized emission at C-band and L-band. The magnetic field in the halo is characterized by strong vertical components above and below the central region of the galaxy. The magnetic field in the disk is only clearly seen in the eastern side of NGC4631, where it is parallel to the plane of the major axis of the galaxy. We detected for the first time a large-scale, smooth Faraday depth pattern in a halo of an external spiral galaxy, which implies the existence of a regular (coherent) magnetic field. A quasi-periodic pattern in Faraday depth with field reversals was found in the northern halo of the galaxy. Conclusions. The field reversals in the northern halo of NGC4631, together with the observed polarization angles, indicate giant magnetic ropes with alternating directions. To our knowledge, this is the first time such reversals are observed in an external galaxy.en_US
dc.description.sponsorshipGerman Federal Ministry of Education and Research (BMBF)Federal Ministry of Education & Research (BMBF) [05A17PB1]; NSFNational Science Foundation (NSF) [AST-1615594]en_US
dc.language.isoenen_US
dc.publisherEDP SCIENCES S Aen_US
dc.rightsCopyright © S. C. Mora-Partiarroyo et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by Max Planck Society.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0
dc.subjectgalaxies: individual: NGC4631en_US
dc.subjectgalaxies: halosen_US
dc.subjectgalaxies: magnetic fieldsen_US
dc.subjectgalaxies: interactionsen_US
dc.subjectgalaxies: spiralen_US
dc.subjectradio continuum: galaxiesen_US
dc.titleCHANG-ES XV. Large-scale magnetic field reversals in the radio halo of NGC 4631en_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTRONOMY & ASTROPHYSICSen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.identifier.piiaa35961-19
dc.source.journaltitleAstronomy & Astrophysics
dc.source.volume632
dc.source.beginpageA11
refterms.dateFOA2020-02-04T18:02:50Z


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Copyright © S. C. Mora-Partiarroyo et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by Max Planck Society.
Except where otherwise noted, this item's license is described as Copyright © S. C. Mora-Partiarroyo et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by Max Planck Society.