The Spatial Correlations of the First Galaxies and their Observability by the James Webb Space Telescope

Details The Spatial Correlations of the First Galaxies and their Observability by the James Webb Space Telescope The Spatial Correlations of the First Galaxies and their Observability by the James Webb Space Telescope

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543902s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #439.02; Bulletin of the American Astronomical Society, Vol. 42, p.395

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Scientific paper

The degree of correlation of the first galaxies drives the number of deep fields that JWST will be forced to observe in order to have an unbiased estimate of their density.
Due to the chemical enrichment of the inter-stellar medium by isolated Population III stars formed in minihalos at redshift z > 30, the chronologically first galaxies are composed of metal-poor Population II stars and are highly clustered. Chemically pristine galaxies in halos with mass M 108 Msun may form instead at z<20 in relatively underdense regions of the Universe once self-enrichment by Population III in minihalos is quenched by the build-up of an H2 photo-dissociating radiative background in the Lyman-Werner bands. We find that these chemically pristine galaxies are essentially uncorrelated so we expect that deep fields with the James Webb Space Telescope will not be seriously affected by cosmic variance for these objects. We predict that 10 < z < 15 metal-free galaxies have area densities of about 80 per arcmin square and per unit redshift but most of them will be too faint even for JWST. However, the predicted density makes these objects interesting targets for searches behind lensing clusters.

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