nisotropies of Cosmic Optical and Near-IR Background from China Space Station Telescope (CSST)

nisotropies of the cosmic optical background (COB) and cosmic near-IRbackground (CNIRB) are capable of addressing some of the key questions incosmology and astrophysics. In this work, we measure and analyze the angularpower spectra of the simulated COB and CNIRB in the ultra-deep field of theChina Space Station Telescope (CSST-UDF). The CSST-UDF covers about 9 squaredegrees, with magnitude limits ~28.3, 28.2, 27.6, 26.7 AB mag for point sourceswith 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 scanningpattern of the CSST, we generate mock data, merge images and mask the brightsources in the four bands. We obtain four angular power spectra from l=200 to2,000,000 (from arcsecond to degree), and fit them with a multi-component modelincluding 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 than8 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 modelparameters are improved by factors of 3~4 in this study, which indicates thatthe CSST-UDF survey can be a powerful probe on the cosmic optical and near-IRbackgrounds.