Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies

Details Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies

1995-09-26

arxiv.org/abs/astro-ph/9509130v1

Astrophys.J.460:303-312,1996

Astronomy and Astrophysics

Astrophysics

25 pages, uuencoded gziped postscript, including all figures. Accepted in ApJ. The preprint is also availale on http://www-u

Scientific paper

10.1086/176970

The spectrum of the supernova relic neutrino background (SRN) from collapse-driven supernovae ever occurred in the universe is calculated by using a realistic, time-dependent supernova rate derived from a standard model of galaxy evolution based on the population synthesis method. The SRN spectrum we show here is the most realistic at present, because the largest uncertainty in previous theoretical predictions has come from unrealistic assumptions of the supernova rate so far made. The SRN is one of the targets of the Superkamiokande (SK) detector which will be constructed in a year and the SRN, if at all detected, would provide a new tool to probe the history of supernova explosions in the universe. The expected event rate at the SK is therefore calculated in this paper. Our major results include: (1) the supernova rate is much higher in the early phase of evolution of galaxies and there appears a hump in the SRN spectrum in the low-energy region of $\ltilde 5$ MeV, (2) the SRN flux depends on the Hubble constant ($H_0$) in a way approximately proportional to $H_0^2$ and only weakly on the density parameter of the universe ($\Omega_0$) and a cosmological constant ($\lambda_0$), and (3) the plausible event rate at the SK is 1.2 yr$^{-1}$ in the observable energy range. Such a low event rate is due mainly to a quite low supernova rate at present which is averaged over the morphological types of galaxies. The most optimistic rate in our model is found to be 4.7 yr$^{-1}$, and if more events are detected, we will have to reconsider our current understanding of collapse-driven supernovae and evolution of galaxies.

Affiliated with

Also associated with

No associations

Rating

Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-443012