Intensity mapping with SDSS/BOSS Lyman-alpha emission, quasars and their Lyman-alpha forest

Understand

We investigate the large-scale structure of Lyman-alpha emission intensity in the Universe at redshifts z=2-3.5 using cross-correlation techniques.

• Our Lya emission samples are spectra of BOSS Luminous Red Galaxies from Data Release 12 with the best fit model galaxies subtracted.
• We cross-correlate the residual flux in these spectra with BOSS quasars, and detect a positive signal on scales 1-15 Mpc/h.
• We identify and remove a source of contamination not previously accounted for, due to the effects of quasar clustering on cross-fibre light.