Publication: Nearby supernova host galaxies from the CALIFA survey II. Supernova environmental metallicity
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2016-07
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Abstract
The metallicity of a supernova progenitor, together with its mass, is one of the main parameters that can rule their outcome. We present the second study of nearby supernova (SN) host galaxies (0.005 < z < 0.03) using Integral Field Spectroscopy (IFS) from the CALIFA survey. We analyze the metallicity of 115 galaxies, which hosted 132 SNe within and 10 SNe outside the field-of-view (FoV) of the instrument. Further 18 galaxies, which hosted only SNe outside the FoV were also studied. Using the O3N2 calibrator from Marino et al. (2013) we found no statistically significant differences between the gas-phase metallicities at the locations of the three main SN types – Ia, Ib/c and II, all having 12 + log(O/H) ≃ 8.50 within 0.02 dex. The total galaxy metallicities are also very similar and we argue that this is because our sample consists only of SNe discovered in massive galaxies (log(M/Mꙩ) > 10 dex) by targeted searches. We also found no evidence that the metallicity at the SN location differs from the average metallicity at the galactocentric distance of the SNe. By extending our SN sample with published metallicities at the SN location, we are able to study the metallicity distributions for all SN subtypes split into SN discovered in targeted and untargeted searches. We confirm a bias toward higher host masses and metallicities in the targeted searches. Combining data from targeted and untargeted searches we found a sequence from higher to lower local metallicity: SN Ia, Ic, and II show the highest metallicity, which is significantly higher than SN Ib, IIb, and Ic-BL. Our results support the picture of SN Ib resulting from binary progenitors and, at least part of, SN Ic being the result of single massive stars stripped of their outer layers by metallicity driven winds. We studied several proxies of the local metallicity frequently used in the literature and found that the total host metallicity allows for the estimation of the metallicity at the SN location with an accuracy better than 0.08 dex and very small bias. In addition, weak AGNs that cannot be seen in the total spectrum may weakly bias (by 0.04 dex) the metallicity estimate from the galaxy integrated spectrum.
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© ESO 2018. ArtÃculo firmado por 19 autores. We acknowledge the A&A editor, Rubina Kotak, for her timely and pertinent comments on preliminary versions of this manuscript. We acknowledge Joseph P. Anderson and Hanindyo Kuncarayakti for fruitful discussions on SN environments (among many other topics). This work was partly funded by FCT with the research grant PTDC/CTE-AST/112582/2009. Support for LG is partially provided by FCT, by CONICYT through FONDECYT grant 3140566, and from the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC12009, awarded to The Millennium Institute of Astrophysics (MAS). V.S. acknowledges financial support from Fundação para a Ciência e a Tecnologia (FCT) under program Ciência 2008. CJW acknowledges support through the Marie Curie Career Integration Grant 303912. This study makes use of the data provided by the Calar Alto Legacy Integral Field Area (CALIFA) survey (http://www.caha.es/CALIFA/). CALIFA is the first legacy survey being performed at Calar Alto. The CALIFA collaboration would like to thank the IAA-CSIC and MPIA-MPG as major partners of the observatory, and CAHA itself, for the unique access to telescope time and support in manpower and infrastructures. The CALIFA collaboration thanks also the CAHA staff for the dedication to this project. Based on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de AstrofÃsica de AndalucÃa (CSIC). The STARLIGHT project is supported by the Brazilian agencies CNPq, CAPES and FAPESP and by the France-Brazil CAPES/Cofecub program. This research has made use of the Asiago Supernova Catalogue, the SIMBAD database, operated at CDS, Strasbourg, France, the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, IAU Circulars presented by the Central Bureau for Astronomical Telegrams, and data products from SDSS and SDSS-II surveys. We acknowledge the usage of the HyperLeda database (http://leda.univ-lyon1.fr).