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Title: INTRINSIC ALIGNMENT OF CLUSTER GALAXIES: THE REDSHIFT EVOLUTION

Abstract

We present measurements of two types of cluster galaxy alignments based on a volume limited and highly pure ({>=}90%) sample of clusters from the GMBCG catalog derived from Data Release 7 of the Sloan Digital Sky Survey (SDSS DR7). We detect a clear brightest cluster galaxy (BCG) alignment (the alignment of major axis of the BCG toward the distribution of cluster satellite galaxies). We find that the BCG alignment signal becomes stronger as the redshift and BCG absolute magnitude decrease and becomes weaker as BCG stellar mass decreases. No dependence of the BCG alignment on cluster richness is found. We can detect a statistically significant ({>=}3{sigma}) satellite alignment (the alignment of the major axes of the cluster satellite galaxies toward the BCG) only when we use the isophotal fit position angles (P.A.s), and the satellite alignment depends on the apparent magnitudes rather than the absolute magnitudes of the BCGs. This suggests that the detected satellite alignment based on isophotal P.A.s from the SDSS pipeline is possibly due to the contamination from the diffuse light of nearby BCGs. We caution that this should not be simply interpreted as non-existence of the satellite alignment, but rather that we cannot detect them withmore » our current photometric SDSS data. We perform our measurements on both SDSS r-band and i-band data, but do not observe a passband dependence of the alignments.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)
  2. Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States)
Publication Date:
OSTI Identifier:
21587401
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 740; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/740/1/39; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALIGNMENT; EVOLUTION; GALAXY CLUSTERS; RED SHIFT

Citation Formats

Jiangang, Hao, Kubo, Jeffrey M, Feldmann, Robert, Annis, James, Johnston, David E, Huan, Lin, and McKay, Timothy A. INTRINSIC ALIGNMENT OF CLUSTER GALAXIES: THE REDSHIFT EVOLUTION. United States: N. p., 2011. Web. doi:10.1088/0004-637X/740/1/39; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Jiangang, Hao, Kubo, Jeffrey M, Feldmann, Robert, Annis, James, Johnston, David E, Huan, Lin, & McKay, Timothy A. INTRINSIC ALIGNMENT OF CLUSTER GALAXIES: THE REDSHIFT EVOLUTION. United States. https://doi.org/10.1088/0004-637X/740/1/39; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Jiangang, Hao, Kubo, Jeffrey M, Feldmann, Robert, Annis, James, Johnston, David E, Huan, Lin, and McKay, Timothy A. Mon . "INTRINSIC ALIGNMENT OF CLUSTER GALAXIES: THE REDSHIFT EVOLUTION". United States. https://doi.org/10.1088/0004-637X/740/1/39; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21587401,
title = {INTRINSIC ALIGNMENT OF CLUSTER GALAXIES: THE REDSHIFT EVOLUTION},
author = {Jiangang, Hao and Kubo, Jeffrey M and Feldmann, Robert and Annis, James and Johnston, David E and Huan, Lin and McKay, Timothy A},
abstractNote = {We present measurements of two types of cluster galaxy alignments based on a volume limited and highly pure ({>=}90%) sample of clusters from the GMBCG catalog derived from Data Release 7 of the Sloan Digital Sky Survey (SDSS DR7). We detect a clear brightest cluster galaxy (BCG) alignment (the alignment of major axis of the BCG toward the distribution of cluster satellite galaxies). We find that the BCG alignment signal becomes stronger as the redshift and BCG absolute magnitude decrease and becomes weaker as BCG stellar mass decreases. No dependence of the BCG alignment on cluster richness is found. We can detect a statistically significant ({>=}3{sigma}) satellite alignment (the alignment of the major axes of the cluster satellite galaxies toward the BCG) only when we use the isophotal fit position angles (P.A.s), and the satellite alignment depends on the apparent magnitudes rather than the absolute magnitudes of the BCGs. This suggests that the detected satellite alignment based on isophotal P.A.s from the SDSS pipeline is possibly due to the contamination from the diffuse light of nearby BCGs. We caution that this should not be simply interpreted as non-existence of the satellite alignment, but rather that we cannot detect them with our current photometric SDSS data. We perform our measurements on both SDSS r-band and i-band data, but do not observe a passband dependence of the alignments.},
doi = {10.1088/0004-637X/740/1/39; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
url = {https://www.osti.gov/biblio/21587401}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 740,
place = {United States},
year = {2011},
month = {10}
}