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 »
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Chicago, Chicago, IL (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- 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}
}
Web of Science
Figures / Tables:
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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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Ellipticity of brightest cluster galaxies as tracer of halo orientation and weak-lensing mass bias
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Figures / Tables found in this record: