The most metal-poor damped Ly alpha system at z<3: constraints on early nucleosynthesis

Abstract

To constrain the conditions for very early nucleosynthesis in the Universe we compare the chemical enrichment pattern of an extremely metal-poor damped Lyman alpha (DLA) absorber with predictions from recent explosive nucleosynthesis model calculations. For this, we have analyzed chemical abundances in the DLA system at z_abs=2.6183 toward the quasar Q0913+072 (z_em=2.785) using public UVES/VLT high spectral resolution data. The total neutral hydrogen column density in this absorber is logN(HI)=20.36. Accurate column densities are derived for CII, NI, OI, AlII, SiII, and FeII. Upper limits are given for FeIII and NiII. With [C/H]=-2.83, [N/H]=-3.84, and [O/H]=-2.47, this system represents one of the most metal-poor DLA systems investigated so far. It offers the unique opportunity to measure accurate CNO abundances in a protogalactic structure at high redshift. Given the very low overall abundance level and the observed abundance pattern, the data suggest that the chemical evolution of this DLA system is dominated by one or at most a few stellar generations. With reference to numerical model calculations, the chemical abundances in the DLA system are consistent with an enrichment from a single starburst of a zero-metallicity population of massive stars (10-50 M_sun) exploding as core-collapse Supernovae (SNe), i.e., the classical Type II Supernovae (SNeII), and possibly as hyper-energetic (E>10^51erg) core-collapse Supernovae, so-called Hypernovae (HNe), as well. In contrast, models using non-zero metallicity progenitors or other explosion mechanisms, such as pair-instability Supernovae (PISNe) or Type Ia Supernovae (SNeIa), do not match the observed abundance pattern.

arXiv comment9 pages, 4 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (37)

• The Nucleosynthetic Signature of Population III
• The 'Forbidden' Abundance of Oxygen in the Sun
• Nucleosynthetic signatures of the first stars
• Nucleosynthesis of Zinc and Iron-Peak Elements in Pop III Type II Supernovae : Comparison with abundances of Very Metal-Poor Halo Stars
• A stellar relic from the early Milky Way
• First stars, very massive black holes and metals
• Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
• First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
• On The Cosmic Origins Of Carbon And Nitrogen
• Formation of the First Stars by Accretion
• The First Cosmic Structures and their Effects
• On the Initial Mass Function of Population III Stars
• Metal Enrichment and Ionization Balance in the Lyman $\alpha$ Forest at $z=3$
• The Hubble Higher-Z Supernova Search: Supernovae to z=1.6 and Constraints on Type Ia Progenitor Models
• The Age-Metallicity Relation of the Universe in Neutral Gas: The First 100 Damped Lya Systems
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems
• Low-Metallicity Inhibition of Type Ia Supernovae and Galactic and Cosmic Chemical Evolution
• Discovery of Damped Lyman-Alpha Systems at Redshifts Less Than 1.65 and Results on their Incidence and Cosmological Mass Density
• Surveys for z > 3 Damped Lyman-alpha Absorption Systems
• The evolution of the C/O ratio in metal-poor halo stars
• The Abundances of Nitrogen and Oxygen in Damped Lyman Alpha Systems
• Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation
• Nucleosynthesis, Reionization, and the Mass Function of the First Stars
• The Explosive Yields Produced by the First Generation of Core Collapse Supernovae and the Chemical Composition of Extremely Metal Poor Stars
• Early stages of Nitrogen enrichment in galaxies: Clues from measurements in damped Lyman alpha systems
• Chemical abundances of Damped Ly alpha systems: A new method for estimating dust depletion effects
• Effects of SNe II and SNe Ia Feedback on the Chemo-Dynamical Evolution of Elliptical Galaxies
• Did Very Massive Stars Pre-enrich and Reionize the Universe?
• Cosmic Star Formation, Reionization, and Constraints on Global Chemical Evolution
• The mass spectrum of metal-free Stars resulting from photodissociation feedback: A scenario for the formation of low-mass population III stars
• Oxygen and Magnesium Abundance in the Ultra-Metal-Poor Giants CS22949-037 and CS29498-043: Challenges in Models of Atmospheres
• Early chemical enrichment of the universe and the role of very massive pop III stars
• Clues to the nature of damped Lyman alpha systems from chemical evolution models
• Hints of star fomation at z>6: the chemical abundances of the DLA system in the QSO BRI 1202-0725 (z_abs = 4.383)
• Metal abundances and kinematics of quasar absorbers - II. Absorption systems toward Q0347-3819 and APM BR J0307-4945
• Metal abundances and kinematics of quasar absorbers.- I. Absorption systems toward J2233-606
• Extremely metal-poor Lyman limit system at z = 2.917 toward the quasar HE 0940-1050

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