Isotopic abundance of carbon in the DLA towards QSO B1331+170
- Autor(en)
- Dinko Milaković, John Webb, Paolo Molaro, Lee Chung-Chi, Prashin Jethwa, Guido Cupani, Michael T. Murphy, Louise Welsh, Valentina D'Odorico, Stefano Cristiani, Ricardo Génova Santos, C. J. A. P. Martins, Nelson J Nunes, Tobias Marius Schmidt, Francesco A Pepe, Maria Rosa Zapatero Osorio, Yann Alibert, J I González Hernández, Paolo Di Marcantonio, Enric Palle, Rafael Rebolo, Nuno C Santos, S. G. Sousa, Alejandro Suárez Mascareño
- Abstrakt
Chemical evolution models predict a gradual build-up of 13C in the Universe, based on empirical nuclear reaction rates and assumptions on the properties of stellar populations. However, old metal-poor stars within the Galaxy contain more 13C than is predicted, suggesting that further refinements to the models are necessary. Gas at high-redshift provides important supplementary information at metallicities −2≲[Fe/H]≲−1, for which there are only a few measurements in the Galaxy. We obtained new, high-quality, VLT/ESPRESSO observations of the QSO B1331+170 and used them to measure 12C/13C in the damped Lyman-α system (DLA) at zabs=1.776, with [Fe/H] = -1.27. AI-VPFIT, an artificial intelligence tool based on genetic algorithms and guided by a spectroscopic information criterion, was used to explore different possible kinematic structures of the carbon gas. Three hundred independent AI-VPFIT models of the absorption system were produced using pre-set 12C/13C values, ranging from 4 to 500. Our results show that 12C/13C=28.5+51.5−10.4, suggesting a possibility of 13C production at low metallicity.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Institute for Fundamental Physics of the Universe, INAF Astronomical Observatory of Triest, University of Cambridge, Big Questions Institute, Swinburne University of Technology, Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Trieste, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Universidade do Porto, Universidade de Lisboa, Universität Genf, Centro de Astrobiología (CSIC-INTA), Universität Bern
- Journal
- Monthly Notices of the Royal Astronomical Society
- Band
- 534
- Seiten
- 12-29
- Anzahl der Seiten
- 18
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stae2056
- Publikationsdatum
- 10-2024
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/d1bed1f9-ddc7-4955-8a38-2d5f1eda87fd