English

AKARI near-infrared background fluctuations arise from normal galaxy populations

Astrophysics of Galaxies 2017-02-15 v1 Cosmology and Nongalactic Astrophysics

Abstract

We show that measurements of the fluctuations in the near-infrared background (NIRB) from the AKARI satellite can be explained by faint galaxy populations at low redshifts. We demonstrate this using reconstructed images from deep galaxy catalogs (HUGS/S-CANDELS) and two independent galaxy population models. In all cases, we find that the NIRB fluctuations measured by AKARI are consistent with faint galaxies and there is no need for a contribution from unknown populations. We find no evidence for a steep Rayleigh-Jeans spectrum for the underlying sources as previously reported. The apparent Rayleigh-Jeans spectrum at large angular scales is likely a consequence of galaxies being removed systematically to deeper levels in the longer wavelength channels.

Keywords

Cite

@article{arxiv.1611.00042,
  title  = {AKARI near-infrared background fluctuations arise from normal galaxy populations},
  author = {Kári Helgason and Eiichiro Komatsu},
  journal= {arXiv preprint arXiv:1611.00042},
  year   = {2017}
}

Comments

Submitted to MNRAS Letters