A new optical polarization catalog for the small magellanic cloud: the magnetic field structure

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dc.contributor.authorLobo Gomes, Aiara
dc.contributor.authorMagalhães, Antônio Mário
dc.contributor.authorPereyra, Antonio
dc.contributor.authorVilega Rodrigues, Cláudia
dc.date.accessioned2018-08-02T16:39:10Z
dc.date.available2018-08-02T16:39:10Z
dc.date.issued2015-06-10
dc.description.abstractWe present a new optical polarimetric catalog for the Small Magellanic Cloud (SMC). It contains a total of 7207 stars, located in the northeast (NE) and Wing sections of the SMC and part of the Magellanic Bridge. This new catalog is a significant improvement compared to previous polarimetric catalogs for the SMC. We used it to study the sky-projected interstellar magnetic field structure of the SMC. Three trends were observed for the ordered magnetic field direction at position angles (PAs) of (65◦ ± 10◦), (115◦ ± 10◦), and (150◦ ± 10◦). Our results suggest the existence of an ordered magnetic field aligned with the Magellanic Bridge direction and SMC’s Bar in the NE region, which have PAs roughly at 115◦.4 and 45◦, respectively. However, the overall magnetic field structure is fairly complex. The trends at 115◦ and 150◦ may be correlated with the SMC’s bimodal structure, observed in Cepheids’ distances and HI velocities. We derived a value of Bsky = (0.947 ± 0.079) µG for the ordered sky-projected magnetic field, and δB = (1.465±0.069) µG for the turbulent magnetic field. This estimate of Bsky is significantly larger (by a factor of ∼ 10) than the line of sight field derived from Faraday rotation observations, suggesting that most of the ordered field component is on the plane of the sky. A turbulent magnetic field stronger than the ordered field agrees with observed estimates for other irregular and spiral galaxies. For the SMC the Bsky/δB ratio is closer to what is observed for our Galaxy than other irregular dwarf galaxies.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationLobo, A., Magalhães, A. M., Pereyra, A., & Vilega Rodrigues, C. (2015). A new optical polarization catalog for the small magellanic cloud: the magnetic field structure.==$The Astrophysical Journal, 806$==(94), 1-19. https://doi.org/10.1088/0004-637X/806/1/94es_ES
dc.identifier.doihttps://doi.org/10.1088/0004-637X/806/1/94es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalThe Astrophysical Journales_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2191
dc.language.isoenges_ES
dc.publisherIOP Publishinges_ES
dc.relation.ispartofurn:issn:0004-637X
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectGalaxieses_ES
dc.subjectMagellanic Cloudses_ES
dc.subjectMagnetic fieldses_ES
dc.subjectInterstellar matteres_ES
dc.subjectAstrophysicses_ES
dc.subjectAstrophysical spectropolarimetryes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleA new optical polarization catalog for the small magellanic cloud: the magnetic field structurees_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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