Meaning of extragalactic background light | Babel Free

Definitions

All the accumulated radiation in the universe due to star formation processes, plus a contribution from active galactic nuclei (AGNs).

uncountable

Examples

“An international group of researchers has developed a new way to measure⟳ accurately the extragalactic background light⟳ (EBL) that fills the universe. The technique involves measuring the attenuation of high-energy gamma rays from distant blazars and it could improve⟳ our understanding of how galaxies form⟳ and evolve, as well as how the universe has expanded since the Big Bang”

“Ground-based observatories have⟳ been collecting 0.2 - 20 TeV gamma rays from blazars for about twenty years. These gamma rays can experience⟳ absorption along the line of sight due to interactions with the extragalactic background light⟳ (EBL). In this paper, we show⟳ that the gamma-ray optical depth can be reduced to the convolution product of an EBL kernel with the EBL intensity, assuming a particular form⟳ for the EBL evolution”

CEFR level