The extended ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II) II. Construction and properties of the survey

Böhringer, H.; Chon, G.; Collins, Chris; Guzzo, L.; Nowak, N.; Bobrovskyi, Sergei

doi:10.1051/0004-6361/201220722

Cited by 67 publications

(128 citation statements)

References 58 publications

(69 reference statements)

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“…The regions of the Magellanic clouds have been masked. The survey region selection, the source detection, the galaxy cluster sample definition and compilation, and the construction of the survey selection function as well as tests of the completeness of the survey are described in Böhringer et al (2013). In brief the survey area is ∼2.4 ster or 13 924 square degrees.…”

Section: The Reflex II Galaxy Cluster Surveymentioning

confidence: 99%

“…The construction of this sample is described in Böhringer et al (2013). In the present paper we describe the construction of the REFLEX II XLF from the galaxy cluster data and the survey selection function derived in Böhringer et al (2013).…”

Section: Introductionmentioning

confidence: 99%

“…In a second paper (Balaguera-Antolinez et al 2012), in which the construction of REFLEX mock samples from simulations used in the earlier paper is described, a preliminary XLF of REFLEX II has been determined. Here we use a completely new approach with updates on the cluster sample, the scaling relations, and the missing flux correction used in the sample construction, with the survey selection function based on the procedures described in Böhringer et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

Böhringer

Chon

Collins

2014

A&A

101

121

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The X-ray luminosity function that is closely related to the cluster mass function is an important statistic of the census of galaxy clusters in our Universe. It is also an important means to probe the cosmological model of our Universe. Based on our recently completed REFLEX II cluster sample comprising 910 galaxy clusters with redshifts we construct the X-ray luminosity function of galaxy clusters for the nearby Universe and discuss its implications. We derived the X-ray luminosity function of the REFLEX II clusters on the basis of a precisely constructed selection function for the full sample and for several redshift slices from z = 0 to z = 0.4. In this redshift interval we find no significant signature of redshift evolution of the luminosity function. We provide the results of fits of a parameterized Schechter function and extensions of it which provide a reasonable characterization of the data. We also use a model for structure formation and galaxy cluster evolution to compare the observed X-ray luminosity function with the theoretical predictions for different cosmological models. The most interesting constraints can be derived for the cosmological parameters Ω m and σ 8 . We explore the influence of several model assumptions on which our analysis is based. We find that the scaling relation of X-ray luminosity and mass introduces the largest systematic uncertainty. From the statistical uncertainty alone we can constrain the matter density parameter, Ω m ∼ 0.27 ± 0.03 and the amplitude parameter of the matter density fluctuations, σ 8 ∼ 0.80 ± 0.03. Marginalizing over the most important uncertainties, the normalisation and slope of the L X − M scaling relation, we have larger error bars and a result of Ω m ∼ 0.29 ± 0.04 and σ 8 ∼ 0.77 ± 0.07 (1σ confidence limits). We compare our results with those of the SZ-cluster survey provided by the Planck mission and we find very good agreement with the results using Planck clusters as cosmological probes, but there is some tension with Planck cosmological results from the microwave background anisotropies, which we discuss in the paper. We also make a comparison with results from the SDSS cluster survey, several cosmological X-ray cluster surveys, and recent Sunyaev-Zel'dovich effect surveys. We find good agreement with these previous results and show that the REFLEX II survey provides a significant reduction in the uncertainties compared to earlier measurements.

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Section: The Reflex II Galaxy Cluster Surveymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

Böhringer

Chon

Collins

2014

A&A

101

121

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“…Here we used the X-ray maps of the ROSAT All-Sky Survey, whose PSF is not Gaussian (see Boese 2000;Böhringer et al 2013). In absence of an analytical expression for the RASS PSF, we have estimated it numerically by stacking observations of X-ray point sources.…”

Section: X-ray Matched Filter: Description Of the Algorithmmentioning

confidence: 99%

Joint signal extraction from galaxy clusters in X-ray and SZ surveys: A matched-filter approach

Tarrío

Melin

Arnaud

et al. 2016

A&A

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The hot ionized gas of the intra-cluster medium emits thermal radiation in the X-ray band and also distorts the cosmic microwave radiation through the Sunyaev-Zel'dovich (SZ) effect. Combining these two complementary sources of information through innovative techniques can therefore potentially improve the cluster detection rate when compared to using only one of the probes. Our aim is to build such a joint X-ray-SZ analysis tool, which will allow us to detect fainter or more distant clusters while maintaining high catalogue purity. We present a method based on matched multifrequency filters (MMF) for extracting cluster catalogues from SZ and X-ray surveys. We first designed an X-ray matched-filter method, analogous to the classical MMF developed for SZ observations. Then, we built our joint X-ray-SZ algorithm by combining our X-ray matched filter with the classical SZ-MMF, for which we used the physical relation between SZ and X-ray observations. We show that the proposed X-ray matched filter provides correct photometry results, and that the joint matched filter also provides correct photometry when the F X /Y 500 relation of the clusters is known. Moreover, the proposed joint algorithm provides a better signal-to-noise ratio than single-map extractions, which improves the detection rate even if we do not exactly know the F X /Y 500 relation. The proposed methods were tested using data from the ROSAT all-sky survey and from the Planck survey.

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“…Given the limited photon statistics esa.int/external/xmm_sw_cal/background/filter_closed/ pn/FF/pn_FF_2014_v1.shtml 2 The radius within which the mean cluster mass density is 500 times the critical density of the Universe. To calculate r 500 for RXCJ2359.3-6042 we used the recipes as described in Böhringer et al (2013). the values of all background components were fixed to the predetermined values from the background region except for the normalisations, which are scaled appropriately according to the areas.…”

Section: Xmm-newton Observationsmentioning

confidence: 99%

Witnessing a merging bullet being stripped in the galaxy cluster RXCJ2359.3-6042

Chon

Böhringer

2015

A&A

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We report the discovery of the merging cluster, RXCJ2359.3-6042, from the REFLEX II cluster survey and present our results from all three detectors combined in the imaging and spectral analysis of the XMM-Newton data. Also known as Abell 4067, this is a unique system, where a compact bullet penetrates an extended, low density cluster at redshift z = 0.0992 clearly seen from our follow-up XMM-Newton observation. The bullet goes right through the central region of the cluster without being disrupted and we can clearly see how the bullet component is stripped of its layers outside the core. There is an indication of a shock heated region in the east of the cluster with a higher temperature. The bulk temperature of the cluster is about 3.12(±0.13) keV implying a lower mass system. Spearheading the bullet is a cool core centred by a massive early type galaxy. The temperatures and metallicities of a few regions in the cluster derived from the spectral analysis supports our conjecture based on the surface brightness image that a much colder compact component at 1.55(±0.10) keV with large metallicity (0.75 Z ) penetrates the main cluster, where the core of the infalling component survived the merger and left stripped gas behind at the centre of the main cluster. We also give an estimate of the total mass within r 500 , which is about 2 × 10 14 M from the deprojected spherical β modelling of the cluster in good agreement with other mass estimates from the M−T X and M−σ v relations.

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The extended ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II) II. Construction and properties of the survey

Cited by 67 publications

References 58 publications

The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

Joint signal extraction from galaxy clusters in X-ray and SZ surveys: A matched-filter approach

Witnessing a merging bullet being stripped in the galaxy cluster RXCJ2359.3-6042

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