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Title: Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensing

Abstract

This is the fourth in a series of papers studying the astrophysics and cosmology of massive, dynamically relaxed galaxy clusters. Here, we use measurements of weak gravitational lensing from the Weighing the Giants project to calibrate Chandra X-ray measurements of total mass that rely on the assumption of hydrostatic equilibrium. This comparison of X-ray and lensing masses measures the combined bias of X-ray hydrostatic masses from both astrophysical and instrumental sources. While we cannot disentangle the two sources of bias, only the combined bias is relevant for calibrating cosmological measurements using relaxed clusters. Assuming a fixed cosmology, and within a characteristic radius (r2500) determined from the X-ray data, we measure a lensing to X-ray mass ratio of 0.96 ± 9% (stat) ± 9% (sys). We find no significant trends of this ratio with mass, redshift or the morphological indicators used to select the sample. Our results imply that any departures from hydrostatic equilibrium at these radii are offset by calibration errors of comparable magnitude, with large departures of tens-of-percent unlikely. In addition, we find a mean concentration of the sample measured from lensing data of c200 = 3.0+4.4–1.8. In conclusion, anticipated short-term improvements in lensing systematics, and a modest expansionmore » of the relaxed lensing sample, can easily increase the measurement precision by 30–50%, leading to similar improvements in cosmological constraints that employ X-ray hydrostatic mass estimates, such as on Ωm from the cluster gas mass fraction.« less

Authors:
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Argelander-Institut fur Astronomie, Bonn (Germany)
  2. Univ. of Chicago, Chicago, IL (United States); Stanford Univ., Stanford, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stanford Univ., Stanford, CA (United States); Niels Bohr Institute, Univ. of Copenhagen Julian Maries Vej, Copenhagen (Denmark)
  5. Exzellenzcluster Universe, Garching (Germany); Ludwig-Maximilians-Univ., Univ.-Sternwarte, Munchen (Germany)
  6. Univ. of California, Berkeley, CA (United States)
  7. Stanford Univ., Stanford, CA (United States)
  8. Institute of Astronomy, Honolulu, HI (United States)
  9. Niels Bohr Institute, Univ. of Copenhagen Julian Maries Vej, Copenhagen (Denmark)
  10. Astronomisches Rechen-Institut, Zentrum fur Astronomie der Univ. Heidelberg, Heidelberg (Germany)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1257733
Report Number(s):
SLAC-PUB-16565
Journal ID: ISSN 0035-8711
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 457; 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; cosmology: observations; X-rays: galaxies: clusters

Citation Formats

Applegate, D. E, Mantz, A., Allen, S. W., von der Linden, A., Morris, R. G., Hilbert, S., Kelly, P. L., Burke, D. L., Ebeling, H., Rapetti, D. A., and Schmidt, R. W. Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensing. United States: N. p., 2016. Web. doi:10.1093/mnras/stw005.
Applegate, D. E, Mantz, A., Allen, S. W., von der Linden, A., Morris, R. G., Hilbert, S., Kelly, P. L., Burke, D. L., Ebeling, H., Rapetti, D. A., & Schmidt, R. W. Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensing. United States. https://doi.org/10.1093/mnras/stw005
Applegate, D. E, Mantz, A., Allen, S. W., von der Linden, A., Morris, R. G., Hilbert, S., Kelly, P. L., Burke, D. L., Ebeling, H., Rapetti, D. A., and Schmidt, R. W. Thu . "Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensing". United States. https://doi.org/10.1093/mnras/stw005. https://www.osti.gov/servlets/purl/1257733.
@article{osti_1257733,
title = {Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensing},
author = {Applegate, D. E and Mantz, A. and Allen, S. W. and von der Linden, A. and Morris, R. G. and Hilbert, S. and Kelly, P. L. and Burke, D. L. and Ebeling, H. and Rapetti, D. A. and Schmidt, R. W.},
abstractNote = {This is the fourth in a series of papers studying the astrophysics and cosmology of massive, dynamically relaxed galaxy clusters. Here, we use measurements of weak gravitational lensing from the Weighing the Giants project to calibrate Chandra X-ray measurements of total mass that rely on the assumption of hydrostatic equilibrium. This comparison of X-ray and lensing masses measures the combined bias of X-ray hydrostatic masses from both astrophysical and instrumental sources. While we cannot disentangle the two sources of bias, only the combined bias is relevant for calibrating cosmological measurements using relaxed clusters. Assuming a fixed cosmology, and within a characteristic radius (r2500) determined from the X-ray data, we measure a lensing to X-ray mass ratio of 0.96 ± 9% (stat) ± 9% (sys). We find no significant trends of this ratio with mass, redshift or the morphological indicators used to select the sample. Our results imply that any departures from hydrostatic equilibrium at these radii are offset by calibration errors of comparable magnitude, with large departures of tens-of-percent unlikely. In addition, we find a mean concentration of the sample measured from lensing data of c200 = 3.0+4.4–1.8. In conclusion, anticipated short-term improvements in lensing systematics, and a modest expansion of the relaxed lensing sample, can easily increase the measurement precision by 30–50%, leading to similar improvements in cosmological constraints that employ X-ray hydrostatic mass estimates, such as on Ωm from the cluster gas mass fraction.},
doi = {10.1093/mnras/stw005},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 457,
place = {United States},
year = {Thu Feb 04 00:00:00 EST 2016},
month = {Thu Feb 04 00:00:00 EST 2016}
}

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