Anisotropies of cosmic optical and near-IR background from the 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 analyse the angular power spectra of the simulated COB and CNIRB in the uliradeep field of the China Space Station Telescope (CSST-UDF). The CSST-UDF covers about 9 deg(2), with magnitude limits similar to 28.3, 28.2, 27.6, 26.7 AB mag for point sources with 5 sigma detection in the r (0.620 mu m), i (0.760 mu m), z (0.915 mu m), and y (0.965 mu m) 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 multicomponent model including intrahalo light (IHL) using the Markov chain Monte Carlo method. We find that, the signal-to-noise ratio of the BM is larger than 8 over the range of angular scales that is useful for astrophysical studies (l similar to 10 000-400 000). Comparing to previous works, the constraints on the model parameters are improved by factors of 3 similar to 4 in this study, which indicates that the CSST-UDF survey can be a powerful probe on the cosmic optical and near-IR backgrounds.