A massive blow for ACDM - the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

A massive blow for ACDM - the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

A massive blow for ACDM - the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

500

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

5249-5267

Kód UT WoS článku

000606297700068

EID výsledku v databázi Scopus

2-s2.0-85099709744