Anisotropies of Cosmic Optical and Near-IR Background from China Space
  Station Telescope (CSST)
  Anisotropies of the cosmic optical background (COB) and cosmic near-IR
background (CNIRB) are capable of addressing some of the key questions in
cosmology and astrophysics. In this work, we measure and analyze the angular
power spectra of the simulated COB and CNIRB in the ultra-deep field of the
China Space Station Telescope (CSST-UDF). The CSST-UDF covers about 9 square
degrees, with magnitude limits ~28.3, 28.2, 27.6, 26.7 AB mag for point sources
with 5-sigma detection in the r (0.620 um), i (0.760 um), z (0.915 um), and y
(0.965 um) bands, respectively. According to the design parameters and scanning
pattern of the CSST, we generate mock data, merge images and mask the bright
sources in the four bands. We obtain four angular power spectra from l=200 to
2,000,000 (from arcsecond to degree), and fit them with a multi-component model
including intrahalo light (IHL) using the Markov chain Monte Carlo (MCMC)
method. We find that the signal-to-noise ratio (SNR) of the IHL is larger than
8 over the range of angular scales that are useful for astrophysical studies
(l~10,000-400,000). Comparing to previous works, the constraints on the model
parameters are improved by factors of 3~4 in this study, which indicates that
the CSST-UDF survey can be a powerful probe on the cosmic optical and near-IR
backgrounds.
