Isotopic abundance of carbon in the DLA towards QSO B1331+170
arxiv(2024)
摘要
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 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 ^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.
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