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Home List of Titles A new candidate for probing Population III nucleosynthesis with carbon-enhanced damped Ly alpha systems
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/230477
- A new candidate for probing Population III nucleosynthesis with carbon-enhanced damped Ly alpha systems
- Cooke, Ryan; Pettini, Max; Murphy, Michael T.
- We report the identification of a very metal poor damped Lyα system (DLA) at zabs = 3.067 295 that is modestly carbon enhanced, with an iron abundance of & 8764;1/700 solar ([Fe/H] =−2.84) and [C,O/Fe] ≃ +0.6. Such an abundance pattern is likely to be the result of nucleosynthesis by massive stars. On the basis of 17 metal absorption lines, we derive a 2σ upper limit on the DLA's kinetic temperature of TDLA ≤ 4700 K, which is broadly consistent with the range of spin temperature estimates for DLAs at this redshift and metallicity. While the best-fitting abundance pattern shows the expected hallmarks of Population III nucleosynthesis, models of high mass Population II stars can match the abundance pattern almost as well. We discuss current limitations in distinguishing between these two scenarios and the marked improvement in identifying the remnants of Population III stars expected from the forthcoming generation of 30-m class telescopes.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 425, no. 1 (Sep 2012), pp. 347-354
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Absorption lines; Abundance patterns; Galaxy evolution; Quasars
- Publisher URL
- Copyright © 2012 The Authors. Monthly Notices of the Royal Astronomical Society copyright © 2012 RAS.
- Research Projects
Galaxy formation and femtosecond frequency combs, Australian Research Council grant number DP0877998
- Peer reviewed