Primordial black holes as near-infrared background sources

被引:0
作者
Manzoni, D. [1 ]
Ziparo, F. [1 ]
Gallerani, S. [1 ]
Ferrara, A. [1 ]
机构
[1] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy
关键词
black hole physics; methods: analytical; cosmic background radiation; dark matter; early Universe; infrared: diffuse background; COBE DIRBE MAPS; DARK-MATTER; POWER SPECTRUM; 1ST STARS; LIGHT; MASS; FLUCTUATIONS; GALAXIES; CONSTRAINTS; POPULATION;
D O I
10.1093/mnras/stad3434
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The near-infrared background (NIRB) is the collective light from unresolved sources observed in the band 1-10 mu m. The measured NIRB angular power spectrum on angular scales theta greater than or similar to 1 arcmin exceeds by roughly two order of magnitudes predictions from known galaxy populations. The nature of the sources producing these fluctuations is still unknown. Here, we test primordial black holes (PBHs) as sources of the NIRB excess. Considering PBHs as a cold dark matter (DM) component, we model the emission of gas accreting on to PBHs in a cosmological framework. We account for both accretion in the intergalactic medium (IGM) and DM haloes. We self-consistently derive the IGM temperature evolution, considering ionization and heating due to X-ray emission from PBHs. Besides lambda cold DM, we consider a model that accounts for the modification of the linear matter power spectrum due to the presence of PBHs; we also explore two PBH mass distributions, i.e. a delta-function and a lognormal distribution. For each model, we compute the mean intensity and the angular power spectrum of the NIRB produced by PBHs with mass 1-10(3)M(circle dot). In the limiting case in which the entirety of DM is made of PBHs, the PBH emission contributes <1 per cent to the observed NIRB fluctuations. This value decreases to <0.1 per cent if current constraints on the abundance of PBHs are taken into account. We conclude that PBHs are ruled out as substantial contributors to the NIRB.
引用
收藏
页码:4153 / 4161
页数:9
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