Extragalactic Background Light: Inventory of light throughout the cosmic history
Kalevi Mattila (1), Petri V\"ais\"anen (2, 3) ((1) Department of, Physics, University of Helsinki, Finland (2) South African Astronomical, Observatory, Cape Town, South Africa (3) Southern African Large Telescope,, Cape Town, South Africa)

TL;DR
This paper reviews the measurement of the Extragalactic Background Light, highlighting recent progress and discussing unresolved components beyond known galaxies and stars, which may include unknown sources.
Contribution
It provides an updated overview of EBL measurements and emphasizes the existence of an unexplained component beyond resolved galaxies.
Findings
Resolved galaxies contribute significantly to EBL
Current measurements suggest an additional unexplained EBL component
Unresolved sources may include faint galaxies, diffuse gas, or unknown phenomena
Abstract
The Extragalactic Background Light (EBL) stands for the mean surface brightness of the sky as we would see it from a representative vantage point in the intergalactic space outside of our Milky Way Galaxy. Averaged over the whole 4 pi solid angle it represents the collective light from all luminous matter radiated throughout the cosmic history. Part of the EBL is resolved into galaxies that, with the increasing detecting power of giant telescopes and sensitive detectors, are seen to deeper and deeper limiting magnitudes. This resolved part is now known to contribute a substantial or even the major part of the EBL. There still remains, however, the challenge of finding out to what extent galaxies too faint or too diffuse to be discerned individually, individual stars or emission by gas outside the galaxies, or more speculatively, some hitherto unknown light sources such as decaying…
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