Near-infrared Extragalactic Background Light Fluctuations on Nonlinear Scales
arXiv:2207.13712 · doi:10.3847/1538-4357/ac9a51
Abstract
Several fluctuation studies on the near-infrared extragalactic background light (EBL) find an excess power at tens of arcminute scales (). Emission from the intra-halo light (IHL) has been proposed as a possible explanation for the excess signal. In this work, we investigate the emission from the integrated galaxy light (IGL) and IHL in the power spectrum of EBL fluctuations using the simulated galaxy catalog MICECAT. We find that at , the one-halo clustering from satellite galaxies has comparable power to the two-halo term in the IGL power spectrum. In some previous EBL analyses, the IGL model assumed a small one-halo clustering signal, which may result in overestimating the IHL contribution to the EBL. We also investigate the dependence of the IGLIHL power spectrum on the IHL distribution as a function of redshift and halo mass, and the spatial profile within the halo. Our forecast suggests that the upcoming SPHEREx deep field survey can distinguish different IHL models considered in this work with high significance. Finally, we quantify the bias in the power spectrum from the correlation of the mask and the signal, which has not been accounted for in previous analyses.
arXiv comment14 pages, 13 figures, accepted by ApJ
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