The HectoMAP Cluster Survey: Spectroscopically Identified Clusters and their Brightest Cluster Galaxies (BCGs)
Abstract
We apply a friends-of-friends (FoF) algorithm to identify galaxy clusters and we use the catalog to explore the evolutionary synergy between brightest cluster galaxies (BCGs) and their host clusters. We base the cluster catalog on the dense HectoMAP redshift survey (2000 redshifts deg-2). The HectoMAP FoF catalog includes 346 clusters with 10 or more spectroscopic members within the range 0.05 < z < 0.55 and with a median z = 0.29. We list these clusters and their members. We also include central velocity dispersions (σ*,BCG) for the FoF cluster BCGs, a distinctive feature of the HectoMAP FoF catalog. HectoMAP clusters with higher galaxy number density (80 systems) are all genuine clusters with a strong concentration and a prominent BCG in Subaru/Hyper Suprime-Cam images. The phase-space diagrams show the expected elongation along the line of sight. Lower-density systems include some low reliability systems. We establish a connection between BCGs and their host clusters by demonstrating that σ*,BCG/σcl decreases as a function of cluster velocity dispersion (σcl), in contrast, numerical simulations predict a constant σ*,BCG/σcl. Sets of clusters at two different redshifts show that BCG evolution in massive systems is slow over the redshift range z < 0.4. The data strongly suggestmore »
- Authors:
-
[1];
[1];
[2];
[3];
[5]
- Smithsonian Astrophysical Observatory, Cambridge, MA (United States)
- Seoul National Univ. (South Korea); Seoul National Univ. (South Korea). SNU Astronomy Research Center
- Univ. di Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
- Western Washington Univ., Bellingham, WA (United States)
- Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics & Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Italian Ministry of Education, University and Research (MIUR)
- OSTI Identifier:
- 1867892
- Grant/Contract Number:
- AC02-76SF00515; L.232/2016
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 923; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Sohn, Jubee, Geller, Margaret J., Hwang, Ho Seong, Diaferio, Antonaldo, Rines, Kenneth J., and Utsumi, Yousuke. The HectoMAP Cluster Survey: Spectroscopically Identified Clusters and their Brightest Cluster Galaxies (BCGs). United States: N. p., 2021.
Web. doi:10.3847/1538-4357/ac29c3.
Sohn, Jubee, Geller, Margaret J., Hwang, Ho Seong, Diaferio, Antonaldo, Rines, Kenneth J., & Utsumi, Yousuke. The HectoMAP Cluster Survey: Spectroscopically Identified Clusters and their Brightest Cluster Galaxies (BCGs). United States. https://doi.org/10.3847/1538-4357/ac29c3
Sohn, Jubee, Geller, Margaret J., Hwang, Ho Seong, Diaferio, Antonaldo, Rines, Kenneth J., and Utsumi, Yousuke. Thu .
"The HectoMAP Cluster Survey: Spectroscopically Identified Clusters and their Brightest Cluster Galaxies (BCGs)". United States. https://doi.org/10.3847/1538-4357/ac29c3. https://www.osti.gov/servlets/purl/1867892.
@article{osti_1867892,
title = {The HectoMAP Cluster Survey: Spectroscopically Identified Clusters and their Brightest Cluster Galaxies (BCGs)},
author = {Sohn, Jubee and Geller, Margaret J. and Hwang, Ho Seong and Diaferio, Antonaldo and Rines, Kenneth J. and Utsumi, Yousuke},
abstractNote = {We apply a friends-of-friends (FoF) algorithm to identify galaxy clusters and we use the catalog to explore the evolutionary synergy between brightest cluster galaxies (BCGs) and their host clusters. We base the cluster catalog on the dense HectoMAP redshift survey (2000 redshifts deg-2). The HectoMAP FoF catalog includes 346 clusters with 10 or more spectroscopic members within the range 0.05 < z < 0.55 and with a median z = 0.29. We list these clusters and their members. We also include central velocity dispersions (σ*,BCG) for the FoF cluster BCGs, a distinctive feature of the HectoMAP FoF catalog. HectoMAP clusters with higher galaxy number density (80 systems) are all genuine clusters with a strong concentration and a prominent BCG in Subaru/Hyper Suprime-Cam images. The phase-space diagrams show the expected elongation along the line of sight. Lower-density systems include some low reliability systems. We establish a connection between BCGs and their host clusters by demonstrating that σ*,BCG/σcl decreases as a function of cluster velocity dispersion (σcl), in contrast, numerical simulations predict a constant σ*,BCG/σcl. Sets of clusters at two different redshifts show that BCG evolution in massive systems is slow over the redshift range z < 0.4. The data strongly suggest that minor mergers may play an important role in BCG evolution in clusters with σcl ≳ 300 km s-1. For lower mass systems (σcl < 300 km s-1), major mergers may play a significant role. The coordinated evolution of BCGs and their host clusters provides an interesting test of simulations in high-density regions of the universe.},
doi = {10.3847/1538-4357/ac29c3},
journal = {The Astrophysical Journal},
number = 2,
volume = 923,
place = {United States},
year = {Thu Dec 16 00:00:00 EST 2021},
month = {Thu Dec 16 00:00:00 EST 2021}
}
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