---
res:
  bibo_abstract:
  - Recently, Planck measured a value of the cosmic microwave background (CMB) optical
    depth due to electron scattering of τ=0.066±0.016. Here we show that this low
    value leaves essentially no room for an early partial reionisation of the intergalactic
    medium (IGM) by high-redshift Population III (Pop III) stars, expected to have
    formed in low-mass minihaloes. We perform semi-analytic calculations of reionisation
    which include the contribution from Pop II stars in atomic cooling haloes, calibrated
    with high-redshift galaxy observations, and Pop III stars in minihaloes with feedback
    due to Lyman-Werner (LW) radiation and metal enrichment. We find that without
    LW feedback or prompt metal enrichment (and assuming a minihalo escape fraction
    of 0.5) the Pop III star formation efficiency cannot exceed ∼a few×10−4, without
    violating the constraints set by Planck data. This excludes massive Pop III star
    formation in typical 106M⊙ minihaloes. Including LW feedback and metal enrichment
    alleviates this tension, allowing large Pop III stars to form early on before
    they are quenched by feedback. We find that the total density of Pop III stars
    formed across cosmic time is ≲104−5 M⊙ Mpc−3 and does not depend strongly on the
    feedback prescription adopted. Additionally, we perform a simple estimate of the
    possible impact on reionisation of X-rays produced by accretion onto black hole
    remnants of Pop III stars. We find that unless the accretion duty cycle is very
    low (≲0.01), this could lead to an optical depth inconsistent with Planck.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Eli
      foaf_name: Visbal, Eli
      foaf_surname: Visbal
  - foaf_Person:
      foaf_givenName: Zoltán
      foaf_name: Haiman, Zoltán
      foaf_surname: Haiman
      foaf_workInfoHomepage: http://www.librecat.org/personId=7c006e8c-cc0d-11ee-8322-cb904ef76f36
  - foaf_Person:
      foaf_givenName: Greg L.
      foaf_name: Bryan, Greg L.
      foaf_surname: Bryan
  bibo_doi: 10.1093/mnras/stv1941
  bibo_issue: '4'
  bibo_volume: 453
  dct_date: 2015^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0035-8711
  - http://id.crossref.org/issn/1365-2966
  dct_language: eng
  dct_publisher: Oxford University Press@
  dct_title: Limits on population III star formation in minihaloes implied by Planck@
...