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Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies

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arxiv 2507.16816 v1 pith:QCJYHZ6K submitted 2025-07-22 astro-ph.GA astro-ph.COastro-ph.HE

Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies

Calvin Leung , Sunil Simha , Isabel Medlock , Daisuke Nagai , Kiyoshi W. Masui , Lordrick A. Kahinga , Adam E. Lanman , Shion Andrew
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Kevin Bandura Alice P. Curtin B. M. Gaensler Nina Gusinskaia Ronniy C. Joseph Mattias Lazda Lluis Mas-Ribas Bradley W. Meyers Kenzie Nimmo Aaron B. Pearlman J. Xavier Prochaska Mawson W. Sammons Kaitlyn Shin Kendrick Smith Haochen Wang
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classification astro-ph.GA astro-ph.COastro-ph.HE
keywords hoststellarmasscontributionfrbsmeasurebaryonicconstrain
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abstract

Low redshift fast radio bursts (FRBs) provide robust measurements of the host-galaxy contribution to the dispersion measure (DM), which can constrain the circumgalactic medium (CGM) of the hosts. We curate a sample of 20 nearby FRBs with low scattering timescales and face-on host galaxies with stellar masses ranging from $10^9 < M^* / M_\odot < 10^{11}$. We fit the distribution of the host galaxy DM to a quadratic model as a function of stellar mass with a mass-independent scatter and find that the more massive the host, the lower its host DM. We report that this relation has a negative slope of $m = -97 \pm 44$ pc/cm$^{-3}$ per dex in stellar mass. We compare this measurement to similar fits to three sub-grid models implemented in the CAMELS suite of simulations from Astrid, IllustrisTNG, and SIMBA and find that fine-tuning of the host ISM contribution as a function of stellar mass is required in order to reconcile the observational data with the predictions of the fiducial CAMELS-Astrid model. More generally, models which attribute a positive correlation between stellar mass and host dispersion measure ($m > 0$) to the CGM are in tension with our measurement. We show that this conclusion is robust to a wide range of assumptions, such as the offset distribution of FRBs from their hosts and the statistics of the cosmic contribution to the DM budget along each sightline. Our results indirectly imply a lower limit on the strength of baryonic feedback in the Local Universe $(z < 0.2)$ in isolated $\sim L^*$ halos, complementing results from weak lensing surveys and kSZ observations which target higher halo mass and redshift ranges.

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Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Fast Radio Bursts probe Galaxy Evolution: Evidence and implications of a redshift-dependent FRB host DM

    astro-ph.GA 2026-06 unverdicted novelty 7.0

    Forward modeling of 90 localized FRBs from DSA and ASKAP yields n_z = 1.62^{+1.48}_{-1.57} for DM_host(z) ∝ (1+z)^{n_z}, excluding n_z=0 at 1σ.

  2. Evaluating the flexibility of the MillenniumTNG galaxy formation model with multi-zoom re-simulations

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    A parameter combination of the MillenniumTNG galaxy-formation model is found that reproduces the observed galaxy stellar-mass function and the lower gas fractions measured in groups and clusters, showing the model is ...

  3. Signatures of Suppressed Matter Clustering revealed by Fast Radio Bursts

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  4. Probing Cosmic Magnetism with Rotation Measure-Squared-Galaxy Cross-Correlations

    astro-ph.CO 2025-12 conditional novelty 6.0

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