Unveiling the internal structure of the Hercules supercluster

Monteiro-Oliveira, R.; Morell, D. F.; Sampaio, V. M.; Ribeiro, A. L. B.; de Carvalho, R. R.

doi:10.1093/mnras/stab3225

Unveiling the internal structure of the Hercules supercluster

Journal Article · Sat Nov 27 00:00:00 EST 2021 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stab3225· OSTI ID:1833442

; ; ; Ribeiro, A. L. B.; de Carvalho, R. R.

ABSTRACT

We have investigated the structure of the Hercules supercluster (SCL160) based on data originally extracted from the Sloan Digital Sky Survey (SDSS-DR7). We have traced the mass distribution in the field through the numerical density, weighted by the r′ luminosity of the galaxies, and classified objects based on their spatial position and redshift. This has allowed us to address not only the kinematics of the supercluster as a whole, but also the internal kinematics of each cluster, which had not been explored further before. We have confirmed that the Hercules supercluster is composed of the galaxy clusters A2147, A2151, and A2152. A2151 consists of five subclusters, A2147 two, and A2152 at least two. They form the heart of the Hercules supercluster. We also have found two other gravitationally bound clusters, therefore increasing the known members of the supercluster. We have estimated a total mass of 2.1 ± 0.2 × 1015 M⊙ for the Hercules supercluster. To determine the dynamical masses in this work, we have resorted to the M200−σ scaling relation and the caustic technique. Comparing both methods with simulated data of bimodal merging clusters, we found that the caustic, as well as the σ-based masses, is biased through the merger age, showing a boost just after pericentric passage. This is not in line with the principle of the caustic method, which affirms it does not depend on the cluster dynamical state.

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: Alfred P. Sloan Foundation; USDOE; USDOE Office of Science (SC)

OSTI ID:: 1833442

Alternate ID(s):: OSTI ID: 1982558

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 509; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Measuring the escape velocity and mass profiles of galaxy clusters beyond their virial radius: Escape velocity and mass in cluster outskirts Serra, Ana Laura; Diaferio, Antonaldo; Murante, Giuseppe Monthly Notices of the Royal Astronomical Society https://doi.org/10.1111/j.1365-2966.2010.17946.x	journal	December 2010
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