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26 April 2024 |
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The explosion energy of early stellar populations: The Fe-peak element ratios in low metallicity damped Lyman-alpha systems | | Ryan Cooke
; Max Pettini
; Regina A. Jorgenson
; Michael T. Murphy
; Gwen C. Rudie
; Charles C. Steidel
; | | Date: |
12 Nov 2012 | | Abstract: | The relative abundances of the Fe-peak elements (Ti-Zn) at the lowest
metallicities are intimately linked to the physics of core-collapse supernova
explosions. With a sample of 25 very metal-poor damped Lyman-alpha systems, we
investigate the trends of the Fe-peak element ratios with metallicity. For nine
of the 25 DLAs, a direct measurement (or useful upper limit) of one or more of
the Ti,Cr,Co,Ni,Zn/Fe abundance ratios could be determined from detected
absorption lines. For the remaining systems (without detections), we devised a
new form of spectral stacking to estimate the typical Fe-peak element ratios of
the DLA population in this metallicity regime. We compare these data to
analogous measurements in metal-poor stars of the Galactic halo and to detailed
calculations of explosive nucleosynthesis in metal-free stars. We conclude that
most of the DLAs in our sample were enriched by stars that released an energy
of < 3.0x10^51 erg when they exploded as core-collapse supernovae. We find one
DLA that appears to be modestly supersolar in Ni/Fe, and tentatively suggest
that this system may have been enriched by hypernovae. We conclude by
discussing the exciting prospect of measuring Fe-peak element ratios in damped
Lyman-alpha systems with Fe/H < 1/1000 of solar when 30-m class telescopes
become available. Only then will we be able to pin down the energy that was
released by the supernovae of the first stars. | | Source: | arXiv, 1211.2805 | | Services: | Forum | Review | PDF | Favorites | |
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