The influence of host galaxy morphology on the properties of Type Ia supernovae from the JLA compilation |
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| Institution: | 1. Laboratoire de Physique Corpusculaire, Université Clermont Auvergne, Université Blaise Pascal, CNRS/IN2P3, Clermont-Ferrand, France;2. Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetsky pr. 13, Moscow 119234, Russia;1. Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, P.R. China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, P.R. China;3. University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, P.R. China;1. Gran Sasso Science Institute (INFN), 67100 Ł’Aquila, Italy;2. Physik-Department and Excellence Cluster Universe, Technische Universität München, 85748 Garching, Germany;3. National Research Centre Kurchatov Institute, 123182 Moscow, Russia;4. Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy;5. Chemical Engineering Department, Princeton University, Princeton, NJ 08544, USA;6. Institut für Experimentalphysik, Universität, 22761 Hamburg, Germany;7. INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy;8. Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;9. Physics Department, Princeton University, Princeton, NJ 08544, USA;10. Dipartimento di Fisica, Università degli Studi e INFN, Genova 16146, Italy;11. Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119234 Moscow, Russia;12. Department of Physics and Astronomy, University of Hawaii, Honolulu, HI 96822, USA;13. AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris Cedex 13, France;14. St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia;15. Joint Institute for Nuclear Research, 141980 Dubna, Russia;p. Department of Physics, University of Houston, Houston, TX 77204, USA;q. M. Smoluchowski Institute of Physics, Jagiellonian University, 30059 Krakow, Poland;r. Institute for Nuclear Research, 03680 Kiev, Ukraine;s. Department of Physics, Technische Universität Dresden, 01062 Dresden, Germany;t. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia;u. IKP-2 Forschungzentrum Jülich, 52428 Jülich, Germany;v. RWTH Aachen University, 52062 Aachen, Germany;w. Physics Department, Queen’s University, Kingston ON K7L 3N6, Canada;x. Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany;y. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara e INFN, Via Saragat 1–44122, Ferrara, Italy;z. Dipartimento di Chimica, Biologia e Biotecnologie, Università e INFN, 06123 Perugia, Italy;1. Amherst Center for Fundamental Interactions and Physics Department, University of Massachusetts, Amherst, MA 01003, USA;2. Physics and Astronomy Department, University of California Los Angeles (UCLA), Los Angeles, California 90095, USA;3. Institute of Physics and Excellence Cluster PRISMA, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany;4. Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe S/N, 22880 Canfranc Estacion Huesca, Spain;1. M.V.Lomonosov Moscow State University, Physics Department, Leninskie gory, GSP-1, Moscow, 119991, Russia;2. M.V.Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetsky pr., 13, Moscow, 119234, Russia;1. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;2. School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Computer Science and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China |
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| Abstract: | The observational cosmology with distant Type Ia supernovae (SNe) as standard candles claims that the Universe is in accelerated expansion, caused by a large fraction of dark energy. In this paper we investigate the SN Ia environment, studying the impact of the nature of their host galaxies on the Hubble diagram fitting. The supernovae (192 SNe) used in the analysis were extracted from Joint-Light-curves-Analysis (JLA) compilation of high-redshift and nearby supernovae which is the best one to date. The analysis is based on the empirical fact that SN Ia luminosities depend on their light curve shapes and colors. We confirm that the stretch parameter of Type Ia supernovae is correlated with the host galaxy type. The supernovae with lower stretch are hosted mainly in elliptical and lenticular galaxies. No significant correlation between SN Ia colour and host morphology was found. We also examine how the luminosities of SNe Ia change depending on host galaxy morphology after stretch and colour corrections. Our results show that in old stellar populations and low dust environments, the supernovae are slightly fainter. SNe Ia in elliptical and lenticular galaxies have a higher α (slope in luminosity-stretch) and β (slope in luminosity-colour) parameter than in spirals. However, the observed shift is at the 1-σ uncertainty level and, therefore, can not be considered as significant. We confirm that the supernova properties depend on their environment and that the incorporation of a host galaxy term into the Hubble diagram fit is expected to be crucial for future cosmological analyses. |
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