Speaker
Description
I will present the joint analysis of HI Intensity Mapping observations with three galaxy samples: the Luminous Red Galaxy (LRG) and Emission Line Galaxy (ELG) samples from the eBOSS survey, and the WiggleZ Dark Energy Survey sample. The H I intensity maps are Green Bank Telescope observations of the redshifted 21cm emission on 100deg2 covering the redshift range 0.6 < z < 1.0. I will show the results of the foreground removal by fastICA, corrected for H I signal loss. In our study, we cross-correlate the cleaned H I data with the galaxy samples and study the overall amplitude as well as the scale dependence of the power spectrum. The cross-correlations constrain the quantity Ω_HI b_HI r_HI,opt at an effective scale keff, where ΩHI is the H I density fraction, b_HI is the H I bias, and r_HI,opt the galaxy-hydrogen correlation coefficient, which is dependent on the H I content of the optical galaxy sample.
