CHIME/FRB Catalog 1 Results: Statistical Cross-correlations with Large-scale Structure
Masoud Rafiei-Ravandi, Kendrick M. Smith, Dongzi Li, Kiyoshi W. Masui, Alexander Josephy, Matt Dobbs, Dustin Lang, Mohit Bhardwaj, Chitrang Patel, Kevin Bandura, Sabrina Berger, P. J. Boyle, Charanjot Brar, Daniela Breitman, Tomas Cassanelli, Pragya Chawla, Fengqiu Adam Dong, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Deborah C. Good, Mark Halpern, Jane Kaczmarek, Victoria M. Kaspi, Calvin Leung, Hsiu-Hsien Lin, Juan Mena-Parra, B. W. Meyers, D. Michilli, Moritz Münchmeyer, Cherry Ng, Emily Petroff, Ziggy Pleunis, Mubdi Rahman, Pranav Sanghavi, Paul Scholz, Kaitlyn Shin, Ingrid H. Stairs, Shriharsh P. Tendulkar, Keith Vanderlinde, Andrew Zwaniga
Abstract
Abstract The CHIME/FRB Project has recently released its first catalog of fast radio bursts (FRBs), containing 492 unique sources. We present results from angular cross-correlations of CHIME/FRB sources with galaxy catalogs. We find a statistically significant ( p -value ∼ 10 −4 , accounting for look-elsewhere factors) cross-correlation between CHIME FRBs and galaxies in the redshift range 0.3 ≲ z ≲ 0.5, in three photometric galaxy surveys: WISE × SCOS, DESI-BGS, and DESI-LRG. The level of cross-correlation is consistent with an order-one fraction of the CHIME FRBs being in the same dark matter halos as survey galaxies in this redshift range. We find statistical evidence for a population of FRBs with large host dispersion measure (∼400 pc cm −3 ) and show that this can plausibly arise from gas in large halos ( M ∼ 10 14 M ⊙ ), for FRBs near the halo center ( r ≲ 100 kpc). These results will improve in future CHIME/FRB catalogs, with more FRBs and better angular resolution.