A massive blow for ACDM - the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10438772" target="_blank" >RIV/00216208:11320/21:10438772 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dfNsgHIC.Z" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dfNsgHIC.Z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staa3441" target="_blank" >10.1093/mnras/staa3441</a>
Alternative languages
Result language
angličtina
Original language name
A massive blow for ACDM - the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
Original language description
El Gordo (ACT-CL J0102-4915) is an extremely massive galaxy cluster (M-200 approximate to 3 x 10(15) M-circle dot) at redshift z = 0.87 composed of two subclusters with a mass ratio of 3.6 merging at speed V-infall approximate to 2500 km s(-1). Such a fast collision between individually rare massive clusters is unexpected in Lambda cold dark matter (ACDM) cosmology at such high Z. However, this is required for non-cosmological hydrodynamical simulations of the merger to match its observed properties. Here, we determine the probability of finding a similar object in a ACDM context using the Jubilee simulation box with a side length of 6h(-1) Gpc. We search for galaxy cluster pairs that have turned around from the cosmic expansion with properties similar to El Gordo in terms of total mass, mass ratio, redshift, and collision velocity relative to virial velocity. We fit the distribution of pair total mass quite accurately, with the fits used in two methods to infer the probability of observing El Gordo in the surveyed region. The more conservative (and detailed) method involves considering the expected distribution of pairwise mass and redshift for analogue pairs with similar dimensionless parameters to El Gordo in the past light-cone of a z = 0 observer. Detecting one pair with its mass and redshift rules out ACDM cosmology at 6.16 sigma. We also use the results of Kraljic and Sarkar to show that the Bullet Cluster is in 2.78 sigma tension once the sky coverage of its discovery survey is accounted for. Using a chi(2) approach, the combined tension can be estimated as 6.43 sigma. Both collisions arise naturally in a Milgromian dynamics (MOND) cosmology with light sterile neutrinos.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
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Volume of the periodical
500
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
19
Pages from-to
5249-5267
UT code for WoS article
000606297700068
EID of the result in the Scopus database
2-s2.0-85099709744