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28 March 2024 |
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Intrinsic alignments in redMaPPer clusters -- I. Central galaxy alignments and angular segregation of satellites | Hung-Jin Huang
; Rachel Mandelbaum
; Peter E. Freeman
; Yen-Chi Chen
; Eduardo Rozo
; Eli Rykoff
; Eric J. Baxter
; | Date: |
3 May 2016 | Abstract: | The shapes of cluster central galaxies are not randomly oriented, but rather
exhibit coherent alignments with the shapes of their parent clusters as well as
with large-scale structure. In this work, we undertake a comprehensive study of
the alignments of central galaxies at low redshift. Based on a sample of 8237
clusters and 94817 members in the redMaPPer cluster catalog with 0.1 < z <
0.35, we first quantify the alignment between the projected central galaxy
shapes and the distribution of member satellites, to understand what central
galaxy and cluster properties most strongly correlate with these alignments.
Next, we investigate the angular segregation of satellites with respect to
their central galaxy major axis directions, to identify the satellite
properties that most strongly predict their angular segregation. We find that
central galaxies are more aligned with their member galaxy distributions in
clusters that are more elongated and have higher richness, and for central
galaxies with larger physical size, higher luminosity and centering
probability, and redder color. Satellites with redder color, higher luminosity,
located closer to the central galaxy, and with smaller ellipticity show a
stronger angular segregation toward their central galaxy major axes. Finally,
we provide physical explanations for some of the identified correlations, and
discuss the connection to theories of central galaxy alignments, the impact of
primordial alignments with tidal fields, and the importance of anisotropic
accretion. | Source: | arXiv, 1605.1065 | Services: | Forum | Review | PDF | Favorites |
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