FLIMFLAM DR1: The First Constraints on the Cosmic Baryon Distribution from Eight Fast Radio Burst Sight Lines
Abstract
The dispersion measure of fast radio bursts (FRBs), arising from the interactions with free electrons along the propagation path, constitutes a unique probe of the cosmic baryon distribution. Their constraining power is further enhanced in combination with observations of the foreground large-scale structure and intervening galaxies. In this work, we present the first constraints on the partition of the cosmic baryons between the intergalactic medium (IGM) and circumgalactic medium (CGM), inferred from the FLIMFLAM spectroscopic survey. In its first data release, the FLIMFLAM survey targeted galaxies in the foreground of eight localized FRBs. Using Bayesian techniques, we reconstruct the underlying ∼Mpc-scale matter density field that is traced by the IGM gas. Simultaneously, deeper spectroscopy of intervening foreground galaxies (at impact parameters b ⊥ ≲ r 200) and the FRB host galaxies constrains the contribution from the CGM. Applying Bayesian parameter inference to our data and assuming a fiducial set of priors, we infer the IGM cosmic baryon fraction to be
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2024
- DOI:
- 10.3847/1538-4357/ad6567
- arXiv:
- arXiv:2402.00505
- Bibcode:
- 2024ApJ...973..151K
- Keywords:
-
- Missing mass;
- Intergalactic gas;
- Circumgalactic medium;
- Cosmic web;
- Redshift surveys;
- 1068;
- 812;
- 1879;
- 330;
- 1378;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 21 pages, 9 figures, 5 tables