Mapping the working of environmental effects in A963

Deshev, Boris; Haines, C. P.; Hwang, Ho Seong; Finoguenov, A.; Taylor, R.; Orlitová, Ivana; Einasto, M.; Ziegler, B.

doi:10.1051/0004-6361/202037803

Cited by 8 publications

(7 citation statements)

References 94 publications

(99 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Large variations in the galaxy populations of individual rich clusters in the same supercluster have been found before, for example, in the superclusters of the Sloan Great Wall and in the Coma supercluster (Einasto et al 2010;Seth & Raychaudhury 2020). Moreover, variations in star formation properties of galaxies have been found in infalling systems near clusters A2142 and A963 (Einasto et al 2010(Einasto et al , 2018aDeshev et al 2017Deshev et al , 2020. This is probably related to the different history of these galaxies (Bahé et al 2013;Seth & Raychaudhury 2020).…”

Section: Summary Of Cluster Propertiesmentioning

confidence: 76%

The Corona Borealis supercluster: connectivity, collapse, and evolution

Einasto

Kipper

Tenjes

et al. 2021

A&A

Self Cite

View full text Add to dashboard Cite

Context. Rich superclusters of galaxies represent dynamically active environments in which galaxies and their systems form and evolve. Aims. We study the dynamical properties and connectivity of the richest galaxy clusters in the Corona Borealis (CB) supercluster and of the whole supercluster, and analyse star formation of galaxies in them with the aim to understand the evolution of the supercluster and the galaxies within it. We compare it with the supercluster SCl A2142. Methods. We used the luminosity-density field to determine the high-density cores of the CB. We identified the richest galaxy clusters in them and studied the dynamical state of the clusters, analysed their substructure, and studied the star formation properties of galaxies in them using normal mixture modelling and the projected phase space diagram. We determined filaments in the supercluster to analyse the connectivity of clusters. To understand the possible future evolution of the CB, we compared the mass distribution in it with predictions from the spherical collapse model and analysed the gravitational acceleration field in the CB. Results. The richest clusters in the high-density cores of the CB are the Abell clusters A2065, A2061 (together with A2067), A2089, and Gr2064. At a radius R30 around each cluster (corresponding to the density contrast Δρ ≈ 30), the galaxy distribution shows a minimum. The R30 values for individual clusters lie in the range of 3 − 6 h−1 Mpc. The radii of the clusters (splashback radii) lie in the range of Rcl ≈ 2 − 3 Rvir. The projected phase space diagrams and the comparison with the spherical collapse model suggest that R30 regions have passed turnaround and are collapsing, forming infall regions around each cluster. Galaxies in the richest cluster of the CB, A2065, and in its infall region have on average younger stellar populations than other clusters and their environment. The cluster A2061 has the highest fraction of galaxies with very old stellar populations, similar to those in A2142. The number of long filaments that begin near clusters vary from one near A2089 to five near A2061. The total connectivity of these clusters (the number of infalling groups and filaments) varies from two to nine. Conclusions. During the future evolution, the clusters in the main part of the CB may merge and form one of the largest bound systems in the nearby Universe. Another part, with the cluster Gr2064, will form a separate system. Our study suggests that structures with a current characteristic density contrast Δρ ≈ 30 have passed turnaround and started to collapse at redshifts z ≈ 0.3 − 0.4. The comparison of the number and properties of the most massive collapsing supercluster cores from observations and simulations may serve as a test for cosmological models.

show abstract

Section: Summary Of Cluster Propertiesmentioning

confidence: 76%

The Corona Borealis supercluster: connectivity, collapse, and evolution

Einasto

Kipper

Tenjes

et al. 2021

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is also possible that the properties of filaments, including their gas content, which could fuel the star formation in galaxies, vary from filament to filament. Earlier studies found a variety of star forming properties of galaxies in the infall zones of rich galaxy clusters, where some infalling structures are populated mostly by passive, red galaxies, and others by blue, star-forming galaxies (Einasto et al 2010;Verdugo et al 2012;Jaffé et al 2016;Deshev et al 2017;Einasto et al 2018b;Deshev et al 2020). The variety of galaxy populations near rich clusters may be attributed to the different history of these galaxies (Bahé et al 2013).…”

Section: Galaxy Evolution In the Supercluster And In The Cocoonmentioning

confidence: 98%

Multiscale cosmic web detachments, connectivity, and preprocessing in the supercluster SCl A2142 cocoon

Einasto

Deshev

Tenjes

et al. 2020

A&A

Self Cite

View full text Add to dashboard Cite

Context. Superclusters of galaxies and their surrounding low-density regions (cocoons) represent dynamically evolving environments in which galaxies and their systems form and evolve. While evolutionary processes of galaxies in dense environments are extensively studied at present, galaxy evolution in low-density regions has received less attention. Aims. We study the properties, connectivity, and galaxy content of groups and filaments in the A2142 supercluster (SCl A2142) cocoon to understand the evolution of the supercluster with its surrounding structures and the galaxies within them. Methods. We calculated the luminosity-density field of SDSS galaxies and traced the SCl A2142 cocoon boundaries by the lowest luminosity-density regions that separate SCl A2142 from other superclusters. We determined galaxy filaments and groups in the cocoon and analysed the connectivity of groups, the high density core (HDC) of the supercluster, and the whole of the supercluster. We compared the distribution and properties of galaxies with different star-formation properties in the supercluster and in the cocoon. Results. The supercluster A2142 and the long filament that is connected to it forms the longest straight structure in the Universe detected so far, with a length of approximately 75 h −1 Mpc. The connectivity of the cluster A2142 and the whole supercluster is C = 6 − 7; poor groups exhibit C = 1 − 2. Long filaments around the supercluster's main body are detached from it at the turnaround region. Among various local and global environmental trends with regard to the properties of galaxies and groups, we find that galaxies with very old stellar populations lie in systems across a wide range of richness from the richest cluster to poorest groups and single galaxies. They lie even at local densities as low as D1 < 1 in the cocoon and up to D1 > 800 in the supercluster. Recently quenched galaxies lie in the cocoon mainly in one region and their properties are different in the cocoon and in the supercluster. The star-formation properties of single galaxies are similar across all environments. Conclusions. The collapsing main body of SCl A2142 with the detached long filaments near it are evidence of an important epoch in the supercluster evolution. There is a need for further studies to explore possible reasons behind the similarities between galaxies with very old stellar populations in extremely different environments, as well as mechanisms for galaxy quenching at very low densities. The presence of long, straight structures in the cosmic web may serve as a test for cosmological models.

show abstract

“…This last simulationbased finding has recently been supported by an observational study (Lisker et al 2018). Since galaxy populations are not only sensitive to the large scale environment of the cluster (Einasto et al 2014) but also to its formation history, in particular its past mergers (Deshev et al 2017), such properties are fundamental requisites to legitimize comparisons between observed and simulated galaxy populations down to the details (Grossauer et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Virgo: an unlikely cluster of galaxies because of its environment

Sorce

Blaizot

Dubois

2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Galaxy clusters constitute powerful cosmological probes thanks to comparisons between observed and simulated clusters. As such Virgo constitutes a formidable source for detailed observations facilitated by its proximity. However, the diversity of clusters complicates the comparisons on a one-to-one basis. Simulated clusters must be carefully selected, a daunting task since most properties are unknown. Alternatively, lookalikes produced in the proper large scale environment can be used. Additionally, their statistical study give access to the mean properties of the observed cluster including its most probable history as well as its deviation from an average cluster. This paper presents such a statistical study with 200 Virgo-like and 400+ cluster-size random dark matter halos. Only 18%(0.5%) of these random halos comply within 3(2)σ with the mean values (radius, velocity dispersion, number of substructures, spin, velocity, concentration, center of mass offset with respect to the spherical center) of Virgo halos at z=0 and abide by a similar merging history up to redshift 4. None are within 1σ because of environmentally induced properties (number of substructures and velocity). For further comparisons, random halos are selected to reproduce the mass distribution of the lookalikes to cancel mass bias effects. Redshift 1 appears then as a turning point: random to Virgo-like property ratios are alternatively smaller/larger than 1. This highlights the importance of studying clusters within their proper large scale environment: simulated galaxy population, grandly affected by the cluster history, can then be compared with the observed one in details. Direct lookalikes simplify grandly the challenge.

show abstract

Mapping the working of environmental effects in A963

Cited by 8 publications

References 94 publications

The Corona Borealis supercluster: connectivity, collapse, and evolution

The Corona Borealis supercluster: connectivity, collapse, and evolution

Multiscale cosmic web detachments, connectivity, and preprocessing in the supercluster SCl A2142 cocoon

Virgo: an unlikely cluster of galaxies because of its environment

Contact Info

Product

Resources

About