Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems

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Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/223407

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Title: Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems
Author(s): Spitler, Lee R.; Romanowsky, Aaron J.; Diemand, Jurg; Strader, Jay; Forbes, Duncan A.; Moore, Ben; Brodie, Jean P.
Abstract: Exploiting a fundamental characteristic of galaxy assembly in the Λ cold dark matter paradigm, the observed spatial biasing and kinematics of metal-poor globular star clusters are used to constrain the local reionization epoch around individual galaxies. Selecting three galaxies located in different environments, the first attempt at constraining the environmental propagation of reionization in the local Universe is carried out. The joint constraint from the three galaxies (z reion = 10.5 +1.0/-0.9) agrees remarkably well with the latest Wilkinson Microwave Anisotropy Probe constraint on zreion for a simple instantaneous reionization model. More importantly, the range of zreion values found here is consistent with the global range of zreion estimates from other observations. We furthermore find a 1.7σ indication that reionization completed in low-density environments before the intergalactic medium in high-density environments was reionized. This is consistent with certain theoretical models that predict that reionization was globally prolonged in duration, with neutral hydrogen pockets surviving in high-density environments, even after the surrounding regions were reionized. More generally, this work provides a useful constraint on the formation history of galaxy stellar haloes.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
Source: Monthly Notices of the Royal Astronomical Society, Vol. 423, no. 3 (Jul 2012), pp. 2177-2189
Publication year: 2012
FOR Code(s): 0201 Astronomical and Space Sciences
Keyword(s): Dark ages; Dynamics; First stars; Galaxies; Haloes; Kinematics; Reionization; Star clusters
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Publisher URL: http://dx.doi.org/10.1111/j.1365-2966.2012.21029.x
Peer reviewed