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Title: Centre-excised X-ray luminosity as an efficient mass proxy for future galaxy cluster surveys

Abstract

The cosmological constraining power of modern galaxy cluster catalogues can be improved by obtaining low-scatter mass proxy measurements for even a small fraction of sources. In the context of large upcoming surveys that will reveal the cluster population down to the group scale and out to high redshifts, efficient strategies for obtaining such mass proxies will be valuable. Here in this work, we use high-quality weak-lensing and X-ray mass estimates for massive clusters in current X-ray-selected catalogues to revisit the scaling relations of the projected, centre-excised X-ray luminosity (L ce), which previous work suggests correlates tightly with total mass. Our data confirm that this is the case with Lce having an intrinsic scatter at fixed mass comparable to that of gas mass, temperature or YX. Compared to the other proxies, however, Lce is less susceptible to systematic uncertainties due to background modelling, and can be measured precisely with shorter exposures. This opens up the possibility of using L ce to estimate masses for large numbers of clusters discovered by new X-ray surveys (e.g. eROSITA) directly from the survey data, as well as for clusters discovered at other wavelengths with relatively short follow-up observations. We describe a simple procedure for makingmore » such estimates from X-ray surface brightness data, and comment on the spatial resolution required to apply this method as a function of cluster mass and redshift. Lastly, we also explore the potential impact of Chandra and XMM–Newton follow-up observations over the next decade on dark energy constraints from new cluster surveys.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4]
  1. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics
  2. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1425667
Grant/Contract Number:  
AC02-76SF00515; NNX15AE12G
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 473; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies clusters intracluster medium; X-rays galaxies clusters

Citation Formats

Mantz, Adam B., Allen, Steven W., Morris, R. Glenn, and von der Linden, Anja. Centre-excised X-ray luminosity as an efficient mass proxy for future galaxy cluster surveys. United States: N. p., 2017. Web. doi:10.1093/mnras/stx2554.
Mantz, Adam B., Allen, Steven W., Morris, R. Glenn, & von der Linden, Anja. Centre-excised X-ray luminosity as an efficient mass proxy for future galaxy cluster surveys. United States. doi:10.1093/mnras/stx2554.
Mantz, Adam B., Allen, Steven W., Morris, R. Glenn, and von der Linden, Anja. Mon . "Centre-excised X-ray luminosity as an efficient mass proxy for future galaxy cluster surveys". United States. doi:10.1093/mnras/stx2554. https://www.osti.gov/servlets/purl/1425667.
@article{osti_1425667,
title = {Centre-excised X-ray luminosity as an efficient mass proxy for future galaxy cluster surveys},
author = {Mantz, Adam B. and Allen, Steven W. and Morris, R. Glenn and von der Linden, Anja},
abstractNote = {The cosmological constraining power of modern galaxy cluster catalogues can be improved by obtaining low-scatter mass proxy measurements for even a small fraction of sources. In the context of large upcoming surveys that will reveal the cluster population down to the group scale and out to high redshifts, efficient strategies for obtaining such mass proxies will be valuable. Here in this work, we use high-quality weak-lensing and X-ray mass estimates for massive clusters in current X-ray-selected catalogues to revisit the scaling relations of the projected, centre-excised X-ray luminosity (Lce), which previous work suggests correlates tightly with total mass. Our data confirm that this is the case with Lce having an intrinsic scatter at fixed mass comparable to that of gas mass, temperature or YX. Compared to the other proxies, however, Lce is less susceptible to systematic uncertainties due to background modelling, and can be measured precisely with shorter exposures. This opens up the possibility of using Lce to estimate masses for large numbers of clusters discovered by new X-ray surveys (e.g. eROSITA) directly from the survey data, as well as for clusters discovered at other wavelengths with relatively short follow-up observations. We describe a simple procedure for making such estimates from X-ray surface brightness data, and comment on the spatial resolution required to apply this method as a function of cluster mass and redshift. Lastly, we also explore the potential impact of Chandra and XMM–Newton follow-up observations over the next decade on dark energy constraints from new cluster surveys.},
doi = {10.1093/mnras/stx2554},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 473,
place = {United States},
year = {2017},
month = {10}
}

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