2024-03-28T14:16:52Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1463212020-05-18T11:25:36Zcom_10261_97com_10261_4col_10261_350
DIGITAL.CSIC
author
Miralles-Caballero, D.
author
Pérez Montero, Enrique
author
Kehrig, C.
author
García-Benito, Rubén
author
Sánchez, S.F.
author
Iglesias-Páramo, J.
author
Vílchez Medina, José Manuel
author
González Delgado, Rosa M.
author
Mast, Damián
author
Mendoza, M. A.
funder
Agence Nationale de la Recherche (France)
funder
European Commission
funder
Ministerio de Ciencia e Innovación (España)
2017-03-08T08:41:44Z
2017-03-08T08:41:44Z
2016
Astronomy and Astrophysics 592: A105 (2016)
http://hdl.handle.net/10261/146321
10.1051/0004-6361/201527179
http://dx.doi.org/10.13039/501100001665http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100004837
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. © 2016 ESO.
eng
openAccess
Galaxies: starburst
Techniques: imaging spectroscopy
Stars: Wolf-Rayet
Galaxies: ISM
First survey of Wolf-Rayet star populations over the full extension of nearby galaxies observed with CALIFA
artículo
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URL
https://digital.csic.es/bitstream/10261/146321/1/IAA_2016_aa27179-15.pdf
File
MD5
9ba1e3e588446934228d470b8f301c64
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application/pdf
IAA_2016_aa27179-15.pdf