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27 results

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  • z ~ 6 metal-line absorbers as a probe of galactic feedback models

  • Laura C. Keating, Ewald Puchwein, Martin G. Haehnelt, Simeon Bird, James S. Bolton
  • Journal:
    Proceedings of the International Astronomical Union / Volume 11 / Issue S321 / March 2016
    Published online by Cambridge University Press:
    21 March 2017, pp. 75-77
    Print publication:
    March 2016
    • Article
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  • Observations of metal absorption lines in the spectra of QSOs out to z > 6 are providing an important probe into the enrichment and ionization state of the intergalactic medium (IGM) at the tail end of reionization. Using simulations with four different feedback models, including the Illustris and Sherwood simulations, we investigate how the overall incidence rate and equivalent width distribution of metal-line absorbers varies with the galactic wind scheme. The low-ionization absorbers are reasonably insensitive to the feedback implementation, with all models reasonably close to the observed incidence rate of O i absorbers. However, all of our models struggle to reproduce the observations of C iv, which is probing overdensities close to the mean at z ~ 6, suggesting that the metals are not being transported out into the IGM efficiently enough in these simulations.

The UNHCR and the Supervision of International Refugee Law
  • Edited by James C. Simeon
  • Published online:
    05 August 2013
    Print publication:
    15 August 2013
  • The 1951 Convention relating to the Status of Refugees, and its 1967 Protocol, and many other important international instruments recognize the unique role the UNHCR plays in protecting refugees and supervising international refugee law. This in-depth analysis of the UNHCR's supervisory role in the international refugee protection regime examines the part played by key institutions, organizations and actors in the supervision of international refugee law. It provides suggestions and recommendations on how the UNHCR's supervisory role can be strengthened to ensure greater State Parties' compliance to their obligations under these international refugee rights treaties, and contributes to enhancing the international protection of refugees and to the promotion of a democratic global governance of the international refugee protection regime.

Critical Issues in International Refugee Law
  • Strategies toward Interpretative Harmony
  • Edited by James C. Simeon
  • Published online:
    17 February 2011
    Print publication:
    19 August 2010
  • This volume of essays examines key cutting-edge areas of international refugee law, including strategies for interpretative harmony, the rights of refugees and the standard of proof in complementary protection. Each topic is examined from a theoretical and a practical perspective in order to find solutions to the many legal issues and concerns which currently confront this area of law, and to seek ways to advance the field as a whole.

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