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A Correlation Between FRB Dispersion Measure and Foreground Large-Scale Structure
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abstract
The distribution of baryons in the Universe remains a fundamental open question in astronomy, and the dispersion measure (DM) of Fast Radio Bursts (FRBs) serves as a valuable tool for probing this cosmic gas. We investigate the impact of the foreground cosmic web on FRB DMs using 61 localized FRBs and public galaxy catalogs. We test for the large-scale structure's impact on cosmological DM using two methods. First, we searched for a correlation between galaxy number density along the line of sight and extragalactic DM, and found a statistically significant positive correlation ($p$ = $1.76 \times 10^{-5}$). The shape of this correlation contains information about the cosmic baryon distribution, and can also be used to better constrain host galaxy DM by providing an estimate of the cosmic contribution on a per-source basis. We observe similar correlations in a mock FRB survey based on the IllustrisTNG cosmological simulation, where the DM is dominated by filaments in the IGM and not by halos. Next, we performed a stacking analysis that measures the average excess DM as a function of impact parameter of foreground galaxies to obtain spatial information about how ionized gas is distributed around galaxy halos. We report excess DM in the stacked signal for impact parameters up to Mpc scales ($\sim$3$\sigma$). Finally, we identified FRBs that do not appear to intersect intervening halos within $r_{vir}$, allowing us to estimate the fraction of baryons that reside in the IGM. We find $f_{\mathrm{IGM}} \geq 0.69$ at 95$\%$ confidence, indicating significant astrophysical feedback.
Forward citations
Cited by 7 Pith papers
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Measurement of angular cross-correlation between the cosmological dispersion measure and the thermal Sunyaev--Zeldovich effect
First detection of an angular cross-correlation between FRB dispersion measure and the thermal SZ y-map: amplitude A≈2 relative to the fiducial halo-model prediction (4.0σ for Planck, 1.5σ for ACT).
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Ray-tracing Fast Radio Bursts Through IllustrisTNG: Cosmological Dispersion Measures from Redshift 0 to 5.5
A new continuous ray-tracing method through IllustrisTNG's Voronoi mesh yields accurate FRB dispersion measure catalogs from redshift 0 to 5.5 and a functional fit that beats the log-normal.
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Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies
Using 20 low-redshift fast radio burst hosts, the authors find host dispersion measure decreases with stellar mass, a trend that conflicts with the weak-feedback CAMELS-Astrid simulation.
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The FRB--Galaxy Overdensity Cross-Correlation Statistic in Dispersion Space
A dispersion-binned FRB–galaxy cross-correlation contains the DM–galaxy cross-correlation as a moment, giving strictly more information and forecasted SNR gains for CHIME and CHORD.
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Probing the Baryon Distribution with Fast Radio Bursts
SKA FRB dispersion measures and their cross-correlations with Stage IV shear and clustering can pin down baryonic feedback and improve cosmological constraints by factors of ~2–5 under optimistic detection rates.
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Calibrating $\rm{DM_{IGM}}-z$ relation using host galaxies of FRBs
A claimed tight sSFR-DM_exc correlation is used to calibrate the DM_IGM-z relation, but the improvement is evaluated on the same data used to fit the model.
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Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO
LOFAR2.0, FAST Core Array and BINGO can constrain the PBH dark matter fraction f_PBH below 0.16-0.39 for masses above 10^{-2} to 10 solar masses via FRB lensing statistics.
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