Galaxy dispersion measured by Fast Radio Bursts as a probe of baryonic feedback models
arxiv(2024)
摘要
Fast Radio Bursts (FRBs) are a sensitive probe of the electron distribution
in both the large-scale structure and their host galaxies through the
dispersion measure (DM) of the radio pulse. Baryonic feedback models are
crucial for modelling small scales for ongoing cosmological surveys that are
expected to change the electron distribution in galaxies in a way that can be
probed by FRB observations. In this paper, we explore the impact of baryonic
feedback on FRB hosts using numerical simulations and make a detailed study of
the host galaxy dispersion as a function of redshift, galaxy type, feedback
model and how these properties vary in independent simulation codes. We find
that the host galaxy dispersion varies dramatically between different
implementations of baryonic feedback, allowing FRBs with host identification to
be a valuable probe of feedback physics and thus provide necessary priors for
upcoming analysis of the statistical properties of the large-scale structure.
We further find that any dependency on the exact location of events within
the halo is small. While there exists an evolution of the dispersion measure
with redshift and halo mass, it is largely driven by varying star formation
rates of the halo. Spectral information from FRB hosts can therefore be used to
put priors on the host galaxy dispersion measure, and FRBs can be used to
distinguish between competing models of baryonic feedback in future studies.
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