Reconstructing the Fraction of Baryons in the Intergalactic Medium with Fast Radio Bursts via Gaussian Processes. (arXiv:2002.10189v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Qiang_D/0/1/0/all/0/1">Da-Chun Qiang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wei_H/0/1/0/all/0/1">Hao Wei</a>
Nowadays, fast radio bursts (FRBs) are promising new probe for astronomy and
cosmology. Due to their extragalactic and cosmological origin, FRBs could be
used to study the intergalactic medium (IGM) and the cosmic expansion. It is
expected that numerous FRBs with identified redshifts will be available in the
future. $rm DM_{IGM}$, the contribution from IGM to the observed dispersion
measure (DM) of FRB, carries the key information about IGM and the cosmic
expansion history. We can study the evolution of the universe by using FRBs
with identified redshifts. In the present work, we are interested in the
fraction of baryon mass in IGM, $f_{rm IGM}$, which is useful to study the
cosmic expansion and the problem of “missing baryons”. We propose to
reconstruct the evolution of $f_{rm IGM}$ as a function of redshift $z$ with
FRBs via a completely model-independent method, namely Gaussian processes.
Since there is no a large sample of FRBs with identified redshifts by now, we
use the simulated FRBs instead. Through various simulations, we show that this
methodology works well.
Nowadays, fast radio bursts (FRBs) are promising new probe for astronomy and
cosmology. Due to their extragalactic and cosmological origin, FRBs could be
used to study the intergalactic medium (IGM) and the cosmic expansion. It is
expected that numerous FRBs with identified redshifts will be available in the
future. $rm DM_{IGM}$, the contribution from IGM to the observed dispersion
measure (DM) of FRB, carries the key information about IGM and the cosmic
expansion history. We can study the evolution of the universe by using FRBs
with identified redshifts. In the present work, we are interested in the
fraction of baryon mass in IGM, $f_{rm IGM}$, which is useful to study the
cosmic expansion and the problem of “missing baryons”. We propose to
reconstruct the evolution of $f_{rm IGM}$ as a function of redshift $z$ with
FRBs via a completely model-independent method, namely Gaussian processes.
Since there is no a large sample of FRBs with identified redshifts by now, we
use the simulated FRBs instead. Through various simulations, we show that this
methodology works well.
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