The El Gordo galaxy cluster challenges ŁambdaCDM for any plausible
collision velocity
E. Asencio, I. Banik, и P. Kroupa. (2023)cite arxiv:2308.00744Comment: 8 pages, 1 figure. Accepted for publication in The Astrophysical Journal in this form.
Аннотация
El Gordo (ACT-CL J0102-4915) is an extraordinarily large and bright galaxy
cluster collision. In a previous study, we found that El Gordo is in
$6.2\sigma$ tension with the $Łambda$CDM standard model when assuming the
nominal mass and infall velocity values from the hydrodynamical simulations of
Zhang et al. ($M_200 = 3.2 10^15 M_ødot$ and $V_infall
= 2500~km~s^-1$, respectively). The recent weak lensing study of Kim
et al. showed that the mass of El Gordo is actually $2.13^+0.25_-0.23
10^15 M_ødot$. Here we explore the level of tension between El
Gordo and $Łambda$CDM for the new mass estimate, assuming several
$V_infall$ values. We find that in order to reduce the tension below
the $5\sigma$ level, the El Gordo subclusters should have $V_infall
< 2300~km~s^-1$ ($V_infall < 1800~km~s^-1$
when considering the combined tension with the Bullet Cluster). To the best of
our knowledge, the El Gordo hydrodynamical simulations conducted so far require
$V_infall 2500~km~s^-1$ to simultaneously reproduce
its morphology and its high X-ray luminosity and temperature. We therefore
conclude that El Gordo still poses a significant challenge to $Łambda$CDM
cosmology. Whether the properties of El Gordo can be reconciled with a lower
$V_infall$ should be tested with new hydrodynamical simulations that
explore different configurations of the interaction.
Описание
The El Gordo galaxy cluster challenges {\Lambda}CDM for any plausible collision velocity
%0 Generic
%1 asencio2023gordo
%A Asencio, E.
%A Banik, I.
%A Kroupa, P.
%D 2023
%K tifr
%T The El Gordo galaxy cluster challenges ŁambdaCDM for any plausible
collision velocity
%U http://arxiv.org/abs/2308.00744
%X El Gordo (ACT-CL J0102-4915) is an extraordinarily large and bright galaxy
cluster collision. In a previous study, we found that El Gordo is in
$6.2\sigma$ tension with the $Łambda$CDM standard model when assuming the
nominal mass and infall velocity values from the hydrodynamical simulations of
Zhang et al. ($M_200 = 3.2 10^15 M_ødot$ and $V_infall
= 2500~km~s^-1$, respectively). The recent weak lensing study of Kim
et al. showed that the mass of El Gordo is actually $2.13^+0.25_-0.23
10^15 M_ødot$. Here we explore the level of tension between El
Gordo and $Łambda$CDM for the new mass estimate, assuming several
$V_infall$ values. We find that in order to reduce the tension below
the $5\sigma$ level, the El Gordo subclusters should have $V_infall
< 2300~km~s^-1$ ($V_infall < 1800~km~s^-1$
when considering the combined tension with the Bullet Cluster). To the best of
our knowledge, the El Gordo hydrodynamical simulations conducted so far require
$V_infall 2500~km~s^-1$ to simultaneously reproduce
its morphology and its high X-ray luminosity and temperature. We therefore
conclude that El Gordo still poses a significant challenge to $Łambda$CDM
cosmology. Whether the properties of El Gordo can be reconciled with a lower
$V_infall$ should be tested with new hydrodynamical simulations that
explore different configurations of the interaction.
@misc{asencio2023gordo,
abstract = {El Gordo (ACT-CL J0102-4915) is an extraordinarily large and bright galaxy
cluster collision. In a previous study, we found that El Gordo is in
$6.2\sigma$ tension with the $\Lambda$CDM standard model when assuming the
nominal mass and infall velocity values from the hydrodynamical simulations of
Zhang et al. ($M_{200} = 3.2 \times 10^{15} M_{\odot}$ and $V_{\textrm{infall}}
= 2500~\textrm{km~s}^{-1}$, respectively). The recent weak lensing study of Kim
et al. showed that the mass of El Gordo is actually $2.13^{+0.25}_{-0.23}
\times 10^{15} M_{\odot}$. Here we explore the level of tension between El
Gordo and $\Lambda$CDM for the new mass estimate, assuming several
$V_{\textrm{infall}}$ values. We find that in order to reduce the tension below
the $5\sigma$ level, the El Gordo subclusters should have $V_{\textrm{infall}}
< 2300~\textrm{km~s}^{-1}$ ($V_{\textrm{infall}} < 1800~\textrm{km~s}^{-1}$
when considering the combined tension with the Bullet Cluster). To the best of
our knowledge, the El Gordo hydrodynamical simulations conducted so far require
$V_{\textrm{infall}} \geq 2500~\textrm{km~s}^{-1}$ to simultaneously reproduce
its morphology and its high X-ray luminosity and temperature. We therefore
conclude that El Gordo still poses a significant challenge to $\Lambda$CDM
cosmology. Whether the properties of El Gordo can be reconciled with a lower
$V_{\textrm{infall}}$ should be tested with new hydrodynamical simulations that
explore different configurations of the interaction.},
added-at = {2023-08-03T06:03:22.000+0200},
author = {Asencio, E. and Banik, I. and Kroupa, P.},
biburl = {https://www.bibsonomy.org/bibtex/28f02aceb66f7d2dc43726514bcc90bd7/citekhatri},
description = {The El Gordo galaxy cluster challenges {\Lambda}CDM for any plausible collision velocity},
interhash = {f0e56a693e9aa72d0c3314f29a6cc8cc},
intrahash = {8f02aceb66f7d2dc43726514bcc90bd7},
keywords = {tifr},
note = {cite arxiv:2308.00744Comment: 8 pages, 1 figure. Accepted for publication in The Astrophysical Journal in this form},
timestamp = {2023-08-03T06:03:22.000+0200},
title = {The El Gordo galaxy cluster challenges {\Lambda}CDM for any plausible
collision velocity},
url = {http://arxiv.org/abs/2308.00744},
year = 2023
}