Improvement of the richness estimates of maxBCG clusters

Eduardo Rozo, Eli S. Rykoff, Benjamin P. Koester, Timothy McKay, Jiangang Hao, August Evrard, Risa H. Wechsler, Sarah Hansen, Erin Sheldon, David Johnston, Matthew Becker, James Annis, Lindsey Bleem, Ryan Scranton

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the LX -richness relation, from to . Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the LX -richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to the better treatment of galaxy color data. We also demonstrate the scatter in the LX -richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can easily be generalized to other mass tracers.

Original languageEnglish (US)
Pages (from-to)601-613
Number of pages13
JournalAstrophysical Journal
Volume703
Issue number1
DOIs
StatePublished - 2009
Externally publishedYes

Fingerprint

cosmology
estimates
estimators
apertures
tracer
filter
matched filters
performance tests
catalogs
tracers
galaxies
color
scaling
test

Keywords

  • Cosmology: observations
  • Methods: data analysis

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Rozo, E., Rykoff, E. S., Koester, B. P., McKay, T., Hao, J., Evrard, A., ... Scranton, R. (2009). Improvement of the richness estimates of maxBCG clusters. Astrophysical Journal, 703(1), 601-613. https://doi.org/10.1088/0004-637X/703/1/601

Improvement of the richness estimates of maxBCG clusters. / Rozo, Eduardo; Rykoff, Eli S.; Koester, Benjamin P.; McKay, Timothy; Hao, Jiangang; Evrard, August; Wechsler, Risa H.; Hansen, Sarah; Sheldon, Erin; Johnston, David; Becker, Matthew; Annis, James; Bleem, Lindsey; Scranton, Ryan.

In: Astrophysical Journal, Vol. 703, No. 1, 2009, p. 601-613.

Research output: Contribution to journalArticle

Rozo, E, Rykoff, ES, Koester, BP, McKay, T, Hao, J, Evrard, A, Wechsler, RH, Hansen, S, Sheldon, E, Johnston, D, Becker, M, Annis, J, Bleem, L & Scranton, R 2009, 'Improvement of the richness estimates of maxBCG clusters', Astrophysical Journal, vol. 703, no. 1, pp. 601-613. https://doi.org/10.1088/0004-637X/703/1/601
Rozo, Eduardo ; Rykoff, Eli S. ; Koester, Benjamin P. ; McKay, Timothy ; Hao, Jiangang ; Evrard, August ; Wechsler, Risa H. ; Hansen, Sarah ; Sheldon, Erin ; Johnston, David ; Becker, Matthew ; Annis, James ; Bleem, Lindsey ; Scranton, Ryan. / Improvement of the richness estimates of maxBCG clusters. In: Astrophysical Journal. 2009 ; Vol. 703, No. 1. pp. 601-613.
@article{1cb517e6d56642bd82eb7e844374ae92,
title = "Improvement of the richness estimates of maxBCG clusters",
abstract = "Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the LX -richness relation, from to . Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the LX -richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to the better treatment of galaxy color data. We also demonstrate the scatter in the LX -richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can easily be generalized to other mass tracers.",
keywords = "Cosmology: observations, Methods: data analysis",
author = "Eduardo Rozo and Rykoff, {Eli S.} and Koester, {Benjamin P.} and Timothy McKay and Jiangang Hao and August Evrard and Wechsler, {Risa H.} and Sarah Hansen and Erin Sheldon and David Johnston and Matthew Becker and James Annis and Lindsey Bleem and Ryan Scranton",
year = "2009",
doi = "10.1088/0004-637X/703/1/601",
language = "English (US)",
volume = "703",
pages = "601--613",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Improvement of the richness estimates of maxBCG clusters

AU - Rozo, Eduardo

AU - Rykoff, Eli S.

AU - Koester, Benjamin P.

AU - McKay, Timothy

AU - Hao, Jiangang

AU - Evrard, August

AU - Wechsler, Risa H.

AU - Hansen, Sarah

AU - Sheldon, Erin

AU - Johnston, David

AU - Becker, Matthew

AU - Annis, James

AU - Bleem, Lindsey

AU - Scranton, Ryan

PY - 2009

Y1 - 2009

N2 - Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the LX -richness relation, from to . Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the LX -richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to the better treatment of galaxy color data. We also demonstrate the scatter in the LX -richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can easily be generalized to other mass tracers.

AB - Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the LX -richness relation, from to . Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the LX -richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to the better treatment of galaxy color data. We also demonstrate the scatter in the LX -richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can easily be generalized to other mass tracers.

KW - Cosmology: observations

KW - Methods: data analysis

UR - http://www.scopus.com/inward/record.url?scp=70549106585&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70549106585&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/703/1/601

DO - 10.1088/0004-637X/703/1/601

M3 - Article

AN - SCOPUS:70549106585

VL - 703

SP - 601

EP - 613

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -