The Redshift Distribution of Distant Supernovae and its Use in Probing Reionization

Abstract

We model the number of detectable supernovae (SNe) as a function of redshift at different flux thresholds, making use of the observed properties of local SNe, such as their lightcurves, fiducial spectra, and peak magnitude distributions. We obtain a rate of 0.4-2.3 SNe/arcmin^2/yr at z > 5 at the near infrared (4.5 micron) flux density threshold of 3 nJy (achievable with the James Webb Space Telescope (JWST) in a 10^5 s integration). In a hypothetical one-year survey, it should be possible to detect up to several thousand SNe per unit redshift at z > 6. We discuss the possible application of such a large sample of distant SNe as a probe of the epoch of reionization. By heating the intergalactic medium and raising the cosmological Jeans mass, the process of reionization can suppress star formation in low-mass galaxies. This could have produced a relatively sharp drop in the SNR around the redshift of reionization. We quantify the detectability of this feature in future surveys of distant SNe by varying the redshift and duration of the feature, as well as its impact on the SFR in low-mass halos, which results in different redshifts, widths, and sizes of the drop in the expected SFR. We find that the drop can be detected out to z_re ~ 13, as long as (i) the reionization history contains a relatively rapid feature which is synchronized over different regions to within Δz < 1 - 3, (ii) the star-formation efficiency in halos that dominate reionization is ~ 10%, and (iii) reionization significantly suppresses the star formation in low-mass halos. Depending on the details of (i) - (iii), this could be achieved with a survey lasting less than two weeks. Detecting this signature would also help elucidate the feedback mechanism that regulates reionization.

arXiv comment11 pages, 9 figures; ApJ accepted

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