The Besancon Galaxy Model renewed I. Constraints on the Galactic thin disc evolution from Tycho data
| Autor: | Czekaj, Maria A., Robin, A. C., Figueras Siñol, Francesca, Luri Carrascoso, Xavier, Haywood, M. |
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| Přispěvatelé: | Departament d'Astronomia i Meteorologia [Barcelona] (DAM), Universitat de Barcelona (UB), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Universitat de Barcelona |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Galactic structure
Evolució galàctica Estructura galàctica Astrophysics::Cosmology and Extragalactic Astrophysics Galaxies Stars Galàxies Estels Milky Way Galactic evolution Galactic kinematics Evolució de les galàxies Cinemàtica galàctica [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics::Galaxy Astrophysics Via Làctia ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 564, pp.A102. ⟨10.1051/0004-6361/201322139⟩ Recercat. Dipósit de la Recerca de Catalunya instname Dipòsit Digital de la UB Universidad de Barcelona |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201322139⟩ |
| Popis: | Context. The understanding of Galaxy evolution can be facilitated by the use of population synthesis models, which allow to test hypotheses on the star formation history, star evolution, as well as chemical and dynamical evolution of the Galaxy. Aims. The new version of the Besanc¸on Galaxy Model (hereafter BGM) aims to provide a more flexible and powerful tool to investigate the Initial Mass Function (IMF) and Star Formation Rate (SFR) of the Galactic disc. Methods. We present a new strategy for the generation of thin disc stars which assumes the IMF, SFR and evolutionary tracks as free parameters. We have updated most of the ingredients for the star count production and, for the first time, binary stars are generated in a consistent way. We keep in this new scheme the local dynamical self-consistency as in Bienayme et al (1987). We then compare simulations from the new model with Tycho-2 data and the local luminosity function, as a first test to verify and constrain the new ingredients. The effects of changing thirteen different ingredients of the model are systematically studied. Results. For the first time, a full sky comparison is performed between BGM and data. This strategy allows to constrain the IMF slope at high masses which is found to be close to 3.0, excluding a shallower slope such as Salpeter"s one. The SFR is found decreasing whatever IMF is assumed. The model is compatible with a local dark matter density of 0.011 M pc−3 implying that there is no compelling evidence for significant amount of dark matter in the disc. While the model is fitted to Tycho2 data, a magnitude limited sample with V |
| Databáze: | OpenAIRE |
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