http://arxiv.org/abs/2208.07218
Extragalactic Background Light (EBL) studies have revealed a significant discrepancy between direct measurements — via instruments measuring bare sky from which Zodiacal and Galactic light models are subtracted — and measurements of the Integrated Galaxy Light (IGL). This discrepancy could lie in either method, whether it be an incomplete Zodiacal model or missed faint galaxies in the IGL calculations. It has been proposed that the discrepancy is due to deep galaxy surveys, such as those with the Hubble Space Telescope, missing up to half of the faint galaxies with $24 \le m_{AB} \le 29$ mag. We address this possibility by creating three replications of the Hubble UltraDeep Field (HUDF) through successive rotations and additions to the original. SourceExtractor is used to analyze these replications to compare the recovered counts and photometry to the original HUDF, allowing us to assess how many galaxies were missed due to confusion, i.e., due to blending with neighboring faint galaxies. This exercise reveals that, while up to 50% of faint galaxies with $28 \le m_{AB} \le 29$ mag were missed or blended with neighboring objects in certain filters, not enough were missed to account for the EBL discrepancy alone in any of the replications.
D. Kramer, T. Carleton, S. Cohen, et. al.
Tue, 16 Aug 22
26/74
Comments: 12 pages, 5 figures. Submitted to ApJ
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