TY - JOUR
T1 - Isotopic abundance of carbon in the DLA towards QSO B1331+170
AU - Milaković, Dinko
AU - Webb, John
AU - Molaro, Paolo
AU - Chung-Chi, Lee
AU - Jethwa, Prashin
AU - Cupani, Guido
AU - Murphy, Michael T.
AU - Welsh, Louise
AU - D'Odorico, Valentina
AU - Cristiani, Stefano
AU - Génova Santos, Ricardo
AU - Martins, C. J. A. P.
AU - Nunes, Nelson J
AU - Schmidt, Tobias Marius
AU - Pepe, Francesco A
AU - Zapatero Osorio, Maria Rosa
AU - Alibert, Yann
AU - González Hernández, J I
AU - Marcantonio, Paolo Di
AU - Palle, Enric
AU - Rebolo, Rafael
AU - Santos, Nuno C
AU - Sousa, S. G.
AU - Mascareño, Alejandro Suárez
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/10
Y1 - 2024/10
N2 - 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.
AB - 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.
KW - quasars: absorption lines
KW - galaxies: ISM
KW - galaxies: abundances
KW - quasars: individual: 1331 + 170
UR - http://www.scopus.com/inward/record.url?scp=85204100986&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae2056
DO - 10.1093/mnras/stae2056
M3 - Article
SN - 0035-8711
VL - 534
SP - 12
EP - 29
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -