Cosmological Reionization by the First Stars: Evolving Spectra of Population III

Details Cosmological Reionization by the First Stars: Evolving Spectra of Population III Cosmological Reionization by the First Stars: Evolving Spectra of Population III

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..267..433t&link_type=abstract

Hot Star Workshop III: The Earliest Stages of Massive Star Birth. ASP Conference Proceedings, Vol. 267. Edited by Paul A. Crowth

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The first stars have received attention as the leading candidates for the sources that reionized the IGM at redshifts z > 6. These stars are hotter and smaller than their counterparts of finite metallicity. We present recent results from an ongoing study of metal-free stars from a cosmological point of view. We have calculated evolving spectra of Pop III clusters. We find that ionizing radiation from these stars is substantially stronger and longer-lasting than that of Pop II stars, particularly in the HeII continuum (E > 4 Ryd). We use a semi-analytic reionization model to assess the effects of Pop III stars on the epochs of HI and HeII reionization. HeII recombination lines may provide a means of detecting metal-free stellar populations at high redshift.

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