Isotopic abundance of carbon in the DLA towards QSO B1331 + 170

Journal
Date Issued
2024
Author(s)
•
Webb, John K.
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•
Lee, Chung Chi
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Jethwa, Prashin
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•
Murphy, Michael T.
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•
•
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Santos, Ricardo Génova
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Martins, Carlos J.A.P.
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Nunes, Nelson J.
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Pepe, Francesco A.
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Osorio, Maria Rosa Zapatero
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Alibert, Yann
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González Hernández, J. I.
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Palle, Enric
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Rebolo, Rafael
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Santos, Nuno C.
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Sousa, Sergio G.
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Mascareño, Alejandro Súarez
DOI
Abstract
Chemical evolution models predict a gradual build-up of 13 C in the Universe, based on empirical nuclear reaction rates and assumptions on the properties of stellar populations. Ho we ver, old metal-poor stars within the Galaxy contain more 13 C 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 12 C/ 13 C in the damped Lyman- αsystem (DLA) at z abs = 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 12 C/ 13 C values, ranging from 4 to 500. Our results show that 12 C/ 13 C = 28 . 5 + 51 . 5 -10 . 4 , suggesting a possibility of 13 C production at low metallicity.
Volume
534
Issue
1
Start page
12
Uri
Url
Issn Identifier
0035-8711
Rights
open.access
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