Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840824h&link_type=abstract
American Astronomical Society, AAS Meeting #218, #408.24; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
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 SDSS DR7. We detect a clear BCG alignment (the alignment of major axis of the BCG toward the distribution of cluster satellite galaxies), but do not detect a satellite alignment (the alignment of the major axes of the cluster satellite galaxies toward the BCG). We find that the BCG alignment signal become 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 detected. We find that the satellite alignment depends on the apparent magnitudes rather than the absolute magnitudes of the BCGs and the methods used to measure the position angles (PAs, hereafter). This suggests that the reported detections of satellite alignment in the literature are more likely due to the use of isophotal PAs, whose measurements are more susceptible to the contamination from the diffuse light of nearby BCGs.
Annis James
Feldmann Robert
Hao Jian-gang
Johnston David E.
Kubo Jeffrey M.
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