First survey of Wolf-Rayet star populations over the full extension of nearby galaxies observed with CALIFA

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Show simple item record Miralles-Caballero, D. Díaz, Angeles I. López-Sánchez, A. R. Rosales Ortega, F. Fabián Monreal-Ibero, Ana Pérez-Montero, E. Kehrig, C. García-Benito, R. Sánchez, S. F. Walcher, C. J. Galbany, L. Iglesias-Páramo, J. Vílchez, J. M. González, R. M. van de Ven, G. Barrera-Ballesteros, J. Lyubenova, M. Mast, D. Falcon-Barroso, J. Meidt, S. Mendoza, M. A. CALIFA Collaboration
dc.contributor.other UAM. Departamento de Física Teórica es_ES 2017-02-21T17:06:02Z 2017-02-21T17:06:02Z 2016-05-10
dc.identifier.citation Astronomy and Astrophysics 592 (2016): A105 en_US
dc.identifier.issn 0004-6361 (print) es_ES
dc.identifier.issn 1432-0746 (online) es_ES
dc.description Astronomy and Astrophysics 592 (2016): A105 reproduced with permission from Astronomy & Astrophysics en_US
dc.description.abstract The search of extragalactic regions with conspicuous presence of Wolf-Rayet (WR) stars outside the Local Group is challenging task owing to the difficulty in detecting their faint spectral features. In this exploratory work, we develop a methodology to perform an automated search of WR signatures through a pixel-by-pixel analysis of integral field spectroscopy (IFS) data belonging to the Calar Alto Legacy Integral Field Area survey, CALIFA. This procedure has been applied to a sample of nearby galaxies spanning a wide range of physical, morphological, and environmental properties. This technique allowed us to build the first catalogue of regions rich in WR stars with spatially resolved information, and enabled us to study the properties of these complexes in a two-dimensional (2D) context. The detection technique is based on the identification of the blue WR bump (around He iiλ4686 Å, mainly associated with nitrogen-rich WR stars; WN) and the red WR bump (around C ivλ5808 Å, mainly associated with carbon-rich WR stars; WC) using a pixel-by-pixel analysis that maximizes the number of independent regions within a given galaxy. We identified 44 WR-rich regions with blue bumps distributed in 25 out of a total of 558 galaxies. The red WR bump was identified only in 5 of those regions. Most of the WR regions are located within one effective radius from the galaxy centre, and around one-third are located within ~1 kpc or less from the centre. We found that the majority of the galaxies hosting WR populations in our sample are involved in some kind of interaction process. Half of the host galaxies share some properties with gamma-ray burst (GRB) hosts where WR stars, such as potential candidates to the progenitors of GRBs, are found. We also compared the WR properties derived from the CALIFA data with stellar population synthesis models, and confirm that simple star models are generally not able to reproduce the observations. We conclude that other effects, such as binary star channel (which could extend theWR phase up to 10 Myr), fast rotation, or other physical processes that cause the loss of observed Lyman continuum photons, very likely affect the derived WR properties, and hence should be considered when modelling the evolution of massive stars en_US
dc.description.sponsorship D.M.C., A.I.D., and F.F.R.O. would like to acknowledge financial support provided by the project AYA2010-21887-C04-03 (former Ministerio de Ciencia e Innovación, Spain) as well as the exchange programme “Study of Emission-Line Galaxies with Integral-Field Spectroscopy” (SELGIFS, FP7- PEOPLE-2013-IRSES-612701), funded by the EU through the IRSES scheme. A.M.I. acknowledges support from Agence Nationale de la Recherche through the STILISM project (ANR-12-BS05-0016-02). R.G.D. acknowledges support through the project AYA2014-57490-P. C.J.W. acknowledges support through the Marie Curie Career Integration Grant 303912. Support for L.G. is provided by the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. L.G. acknowledges support by CONICYT through FONDECYT grant 3140566 en_US
dc.format.extent 31 pag. es_ES
dc.format.mimetype application/pdf en
dc.language.iso eng en
dc.publisher EDP Sciences en_US
dc.relation.ispartof Astronomy and Astrophysics en_US
dc.rights © ESO 2016 en_US
dc.subject.other Galaxies: ISM en_US
dc.subject.other Galaxies: starburst en_US
dc.subject.other Stars: Wolf-Rayet en_US
dc.subject.other Techniques: imaging spectroscopy en_US
dc.title First survey of Wolf-Rayet star populations over the full extension of nearby galaxies observed with CALIFA en_US
dc.type article en
dc.subject.eciencia Física es_ES
dc.relation.publisherversion es_ES
dc.identifier.doi 10.1051/0004-6361/201527179 es_ES
dc.identifier.publicationfirstpage A105 es_ES
dc.identifier.publicationlastpage A105 es_ES
dc.identifier.publicationvolume 592 es_ES
dc.relation.projectID Gobierno de España. AYA2010-21887-C04-03 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/303912 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/612701 es_ES
dc.relation.projectID Gobierno de España. AYA2014-57490-P es_ES
dc.type.version info:eu-repo/semantics/publishedVersion en
dc.rights.accessRights openAccess en
dc.authorUAM Díaz Beltrán, Ángeles Isabel (259696)
dc.authorUAM Rosales Ortega, Fernando Fabián (264791)

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