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Near-infrared Extragalactic Background Light Fluctuations on Nonlinear Scales

Cheng, Yun-Ting and Bock, James J. (2022) Near-infrared Extragalactic Background Light Fluctuations on Nonlinear Scales. Astrophysical Journal, 940 (2). Art. No. 115. ISSN 0004-637X. doi:10.3847/1538-4357/ac9a51.

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Several fluctuation studies on the near-infrared extragalactic background light (EBL) find an excess power at tens of arcminute scales (ℓ ∼ 10³). 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 ℓ ∼ 10³, 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 IGL+IHL 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.

Item Type:Article
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URLURL TypeDescription
Cheng, Yun-Ting0000-0002-5437-0504
Bock, James J.0000-0002-5710-5212
Additional Information:We are grateful to Mike Zemcov for providing analysis on refitting our model to CIBER data. We thank Asantha Cooray, Tzu-Ching Chang, and the CIBER and SPHEREx collaborations for helpful discussions. We thank Mike Zemcov, Shuji Matsuura, and Richard Feder for valuable comments that improve the manuscript. This work was supported by NASA grants NNX16AJ69G and 80NSSC20K0595. This work has made use of CosmoHub. CosmoHub has been developed by the Port d'Informació Científica (PIC), maintained through a collaboration of the Institut de Física d'Altes Energies (IFAE) and the Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) and the Institute of Space Sciences (CSIC & IEEC), and was partially funded by the "Plan Estatal de Investigación Científica y Técnica y de Innovación" program of the Spanish government.
Group:Astronomy Department
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Issue or Number:2
Record Number:CaltechAUTHORS:20221212-795726500.6
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118303
Deposited By: Research Services Depository
Deposited On:13 Jan 2023 13:37
Last Modified:13 Jan 2023 13:37

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