Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732002c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #320.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
What is the total radiative content of the Universe since the epoch of recombination? The extragalactic background light (EBL) spectrum captures the redshifted energy released from the first stellar objects, protogalaxies, and galaxies throughout cosmic history. Yet, we have not determined the brightness of the extragalactic sky from UV/optical to infrared wavelengths with sufficient accuracy to establish the radiative content of the Universe to better than an order of magnitude. Among many science topics, an accurate measurement of the EBL spectrum in optical and near-IR will address: What is the total energy released by stellar nucleosynthesis over cosmic history? Was significant energy released by non-stellar processes? Is there a diffuse component to the EBL? When did first stars appear and how luminous was the reionization epoch? Absolute optical to near-IR EBL spectrum down to the sufficient accuracy to study reionization can be established by wide field imaging at a distance of 5 AU or more or above the ecliptic plane where the zodiacal foreground is reduced by more than three orders of magnitude. This talk will summarize the key scientific goals of a potential outer Solar system EBL measurement through diffuse sky mapping.
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