Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-11-18
Astronomy and Astrophysics
Astrophysics
27 pages, including 4 postscript figures. Uses AAS LATeX style aasms4. Submitted to The Astrophysical Journal
Scientific paper
(Abridged) Statistical analysis of the unresolved light in the Hubble Deep Field (HDF) strongly constrains possible sources of the optical Extragalactic Background Light (EBL). To test for the statistical signature of previously undetected sources, we estimate the auto, cross, and color correlations of the ``sky'' in the HDF that remains after masking objects brighter than I=30 mag. This measurement yields the most stringent limits to date on small-scale structure in the night sky; analysis of shallower imaging would be dominated by galaxies now detected by the HDF. Unless there is a truly uniform optical background, the mean EBL is likely to be within a small fraction of the surface brightness from detected galaxies. No currently plausible sources of additional EBL satisfy the constraints that they (1) would not have already been detected, (2) contribute EBL comparable to that from detected galaxies, and (3) do not produce EBL fluctuations in excess of the upper limits set by correlations in the HDF.
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