2020/09/06 by Meng Zhou, Zhou, Meng, Jianrong Tan +3 · 1 citation
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #astro-ph.CO #astro-ph.GA #astro-ph.IM
paper · pdf · doi:10.48550/arxiv.2009.02765
arXiv:2009.02765 (now withdrawn) and arXiv:2009.02766 are now merged into a long paper that has now been accepted for publication at the ApJ. This published version is updated in arXiv:2009.02766
arxiv created 2021/01/08 · arxiv updated 2021/01/11
Intensity mapping of the HI 21 cm line and the CO 2.61 mm line from the epoch of reionization has emerged as powerful, complementary, probes of the high-redshift Universe. However, both maps and their cross-correlation are dominated by foregrounds. We propose a new analysis by which the signal is unbiased by foregrounds, i.e. it can be measured without foreground mitigation. We construct the antisymmetric part of the HI-CO cross-correlation, arising because the statistical fluctuations of two fields have different evolution in time. We show that the sign of this new signal can distinguish model-independently whether inside-out reionization happens during some interval of time.