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Title: The ellipticity of galaxy cluster haloes from satellite galaxies and weak lensing

Abstract

Here, we study the ellipticity of galaxy cluster haloes as characterized by the distribution of cluster galaxies and as measured with weak lensing. We use Monte Carlo simulations of elliptical cluster density profiles to estimate and correct for Poisson noise bias, edge bias and projection effects. We apply our methodology to 10 428 Sloan Digital Sky Survey clusters identified by the redMaPPer algorithm with richness above 20. We find a mean ellipticity =0.271 ± 0.002 (stat) ±0.031 (sys) corresponding to an axis ratio = 0.573 ± 0.002 (stat) ±0.039 (sys). We compare this ellipticity of the satellites to the halo shape, through a stacked lensing measurement using optimal estimators of the lensing quadrupole based on Clampitt and Jain (2016). We find a best-fitting axis ratio of 0.56 ± 0.09 (stat) ±0.03 (sys), consistent with the ellipticity of the satellite distribution. Thus, cluster galaxies trace the shape of the dark matter halo to within our estimated uncertainties. Finally, we restack the satellite and lensing ellipticity measurements along the major axis of the cluster central galaxy's light distribution. From the lensing measurements, we infer a misalignment angle with an root-mean-square of 30° ± 10° when stacking on the central galaxy. We discussmore » applications of halo shape measurements to test the effects of the baryonic gas and active galactic nucleus feedback, as well as dark matter and gravity. The major improvements in signal-to-noise ratio expected with the ongoing Dark Energy Survey and future surveys from Large Synoptic Survey Telescope, Euclid, and Wide Field Infrared Survey Telescope will make halo shapes a useful probe of these effects.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Chicago, Chicago, IL (United States)
  3. Univ. of Arizona, Tucson, AZ (United States)
  4. 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
OSTI Identifier:
1436107
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 475; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gravitational lensing: weak, galaxies: clusters: general; galaxies: haloes; dark matter; large-scale structure of Universe

Citation Formats

Shin, Tae-hyeon, Clampitt, Joseph, Jain, Bhuvnesh, Bernstein, Gary, Neil, Andrew, Rozo, Eduardo, and Rykoff, Eli. The ellipticity of galaxy cluster haloes from satellite galaxies and weak lensing. United States: N. p., 2018. Web. doi:10.1093/mnras/stx3366.
Shin, Tae-hyeon, Clampitt, Joseph, Jain, Bhuvnesh, Bernstein, Gary, Neil, Andrew, Rozo, Eduardo, & Rykoff, Eli. The ellipticity of galaxy cluster haloes from satellite galaxies and weak lensing. United States. https://doi.org/10.1093/mnras/stx3366
Shin, Tae-hyeon, Clampitt, Joseph, Jain, Bhuvnesh, Bernstein, Gary, Neil, Andrew, Rozo, Eduardo, and Rykoff, Eli. Thu . "The ellipticity of galaxy cluster haloes from satellite galaxies and weak lensing". United States. https://doi.org/10.1093/mnras/stx3366. https://www.osti.gov/servlets/purl/1436107.
@article{osti_1436107,
title = {The ellipticity of galaxy cluster haloes from satellite galaxies and weak lensing},
author = {Shin, Tae-hyeon and Clampitt, Joseph and Jain, Bhuvnesh and Bernstein, Gary and Neil, Andrew and Rozo, Eduardo and Rykoff, Eli},
abstractNote = {Here, we study the ellipticity of galaxy cluster haloes as characterized by the distribution of cluster galaxies and as measured with weak lensing. We use Monte Carlo simulations of elliptical cluster density profiles to estimate and correct for Poisson noise bias, edge bias and projection effects. We apply our methodology to 10 428 Sloan Digital Sky Survey clusters identified by the redMaPPer algorithm with richness above 20. We find a mean ellipticity =0.271 ± 0.002 (stat) ±0.031 (sys) corresponding to an axis ratio = 0.573 ± 0.002 (stat) ±0.039 (sys). We compare this ellipticity of the satellites to the halo shape, through a stacked lensing measurement using optimal estimators of the lensing quadrupole based on Clampitt and Jain (2016). We find a best-fitting axis ratio of 0.56 ± 0.09 (stat) ±0.03 (sys), consistent with the ellipticity of the satellite distribution. Thus, cluster galaxies trace the shape of the dark matter halo to within our estimated uncertainties. Finally, we restack the satellite and lensing ellipticity measurements along the major axis of the cluster central galaxy's light distribution. From the lensing measurements, we infer a misalignment angle with an root-mean-square of 30° ± 10° when stacking on the central galaxy. We discuss applications of halo shape measurements to test the effects of the baryonic gas and active galactic nucleus feedback, as well as dark matter and gravity. The major improvements in signal-to-noise ratio expected with the ongoing Dark Energy Survey and future surveys from Large Synoptic Survey Telescope, Euclid, and Wide Field Infrared Survey Telescope will make halo shapes a useful probe of these effects.},
doi = {10.1093/mnras/stx3366},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 475,
place = {United States},
year = {Thu Jan 04 00:00:00 EST 2018},
month = {Thu Jan 04 00:00:00 EST 2018}
}

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Cited by: 29 works
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Figures / Tables:

Figure 1. Figure 1.: Satellite density contours of all clusters, with random orientations (left panel), stacked to align the major axis of the central galaxy (middle panel), and stacked along the major axis of the satellite distribution itself (right panel), in the unit of “galaxy number density per Mpc2h−2 per cluster”. Comparingmore » the middle and right panels shows how the satellite distribution in the outer parts is misaligned with respect to the central galaxy. The sample is restricted to the ∼ 6,700 subset with a measured major axis for the central galaxy.« less

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text, January 2008


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text, January 2011


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text, January 2012


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text, January 2013


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text, January 2013


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text, January 2016


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text, January 2016


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text, January 2003


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text, January 2005


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text, January 2006


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text, January 2007


Works referencing / citing this record:

Projected alignment of non-sphericities of stellar, gas, and dark matter distributions in galaxy clusters: analysis of the Horizon-AGN simulation
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