Kavli Affiliate: James J. Bock
| First 5 Authors: Richard M. Feder, James J. Bock, Yun-Ting Cheng, Asantha Cooray, Phillip M. Korngut
| Summary:
Precise, unbiased measurements of extragalactic background anisotropies
require careful treatment of systematic effects in fluctuation-based,
broad-band intensity mapping measurements. In this paper we detail improvements
in methodology for the Cosmic Infrared Background ExpeRiment (CIBER),
concentrating on flat field errors and source masking errors. In order to
bypass the use of field differences, which mitigate flat field errors but
reduce sensitivity, we characterize and correct for the flat field on
pseudo-power spectra, which includes both additive and multiplicative biases.
To more effectively mask point sources at 1.1 $mu$m and 1.8 $mu$m, we develop
a technique for predicting masking catalogs that utilizes optical and NIR
photometry through random forest regression. This allows us to mask over two
Vega magnitudes deeper than the completeness limits of 2MASS alone, with errors
in the shot noise power remaining below $<10%$ at all masking depths
considered. Through detailed simulations of CIBER observations, we validate our
formalism and demonstrate unbiased recovery of the sky fluctuations on
realistic mocks. We demonstrate that residual flat field errors comprise
$<20%$ of the final CIBER power spectrum uncertainty with this methodology.
| Search Query: ArXiv Query: search_query=au:”James J. Bock”&id_list=&start=0&max_results=3