Synoptic Sky Surveys and the Diffuse Supernova Neutrino Background: Removing Astrophysical Uncertainties and Revealing Invisible Supernovae - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Synoptic Sky Surveys and the Diffuse Supernova Neutrino Background: Removing Astrophysical Uncertainties and Revealing Invisible Supernovae - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The cumulative antineutrino production from all core-collapse supernovaewithin our cosmic horizon gives rise to the diffuse supernova neutrinobackground DSNB, which is on the verge of detectability. The observed fluxdepends on supernova physics, but also on the cosmic history of supernovaexplosions; currently, the cosmic supernova rate introduces a substantial+-40% uncertainty, largely through its absolute normalization. However, anew class of wide-field, repeated-scan synoptic optical sky surveys is comingonline, and will map the sky in the time domain with unprecedented depth,completeness, and dynamic range. We show that these surveys will obtain thecosmic supernova rate by direct counting, in an unbiased way and with highstatistics, and thus will allow for precise predictions of the DSNB. Upcomingsky surveys will substantially reduce the uncertainties in the DSNB sourcehistory to an anticipated +-5% that is dominated by systematics, so that theobserved high-energy flux thus will test supernova neutrino physics. Theportion of the universe z < 1 accessible to upcoming sky surveys includes theprogenitors of a large fraction ~ 87% of the expected 10-26 MeV DSNB eventrate. We show that precision determination of the optically detected cosmicsupernova history will also make the DSNB into a strong probe of an extra fluxof neutrinos from optically invisible supernovae, which may be unseen eitherdue to unexpected large dust obscuration in host galaxies, or because somecore-collapse events proceed directly to black hole formation and fail to givean optical outburst.



Author: Amy Lien U of Illinois, Brian D. Fields U of Illinois, John F. Beacom Ohio State

Source: https://arxiv.org/



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