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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26603
Title: Intrinsic scatter of caustic masses and hydrostatic bias: An observational study
Authors: ANDREON, Stefano 
TRINCHIERI, Ginevra 
MORETTI, Alberto 
Wang, J.
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 606
First Page: A25
Abstract: All estimates of cluster mass have some intrinsic scatter and perhaps some bias with true mass even in the absence of measurement errors for example caused by cluster triaxiality and large scale structure. Knowledge of the bias and scatter values is fundamental for both cluster cosmology and astrophysics. In this paper we show that the intrinsic scatter of a mass proxy can be constrained by measurements of the gas fraction because masses with higher values of intrinsic scatter with true mass produce more scattered gas fractions. Moreover, the relative bias of two mass estimates can be constrained by comparing the mean gas fraction at the same (nominal) cluster mass. Our observational study addresses the scatter between caustic (I.e., dynamically estimated) and true masses, and the relative bias of caustic and hydrostatic masses. For these purposes, we used the X-ray Unbiased Cluster Sample, a cluster sample selected independently from the intracluster medium content with reliable masses: 34 galaxy clusters in the nearby (0.050 < z < 0.135) Universe, mostly with 14 < log M<SUB>500</SUB>/M<SUB>☉</SUB> ≲ 14.5, and with caustic masses. We found a 35% scatter between caustic and true masses. Furthermore, we found that the relative bias between caustic and hydrostatic masses is small, 0.06 ± 0.05 dex, improving upon past measurements. The small scatter found confirms our previous measurements of a highly variable amount of feedback from cluster to cluster, which is the cause of the observed large variety of core-excised X-ray luminosities and gas masses.
URI: http://hdl.handle.net/20.500.12386/26603
URL: https://www.aanda.org/articles/aa/abs/2017/10/aa30920-17/aa30920-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201730920
Bibcode ADS: 2017A&A...606A..25A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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