Simulated ROSAT observations of clusters of galaxies

Cruddace, R. G.; Hasinger, G.; Truemper, J.; Schmidt, Jon; Hartner, Gisela; Rosso, C.; Snowden, S. L.

doi:10.1007/bf00426719

Cited by 15 publications

(12 citation statements)

References 13 publications

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“…Running on the ninety strips representing the RASS in this framework, the SASS detected 49,441 X-ray sources (multiple detections removed, see Cruddace et al [1991] for details of the source detection procedure) which constitute the X-ray sample upon which most of the statistical RASS studies performed to date are based. Note that, although, in this first processing of the survey data, the SASS provided count rates in various energy bands, the actual source detection was performed exclusively in the PSPC broad band, i.e., in the energy range from 0.1 − 2.4 keV.…”

Section: The X-ray Database †mentioning

confidence: 99%

The ROSAT Brightest Cluster Sample -- I. The compilation of the sample and the cluster log N--log S distribution

Ebeling

Edge

Böhringer

et al. 1998

Monthly Notices of the Royal Astronomical Society

644

761

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We present a 90 per cent flux‐complete sample of the 201 X‐ray‐brightest clusters of galaxies in the northern hemisphere (δ ≥ 0°), at high Galactic latitudes (|b| ≥ 20°), with measured redshifts z ≤ 0.3 and fluxes higher than 4.4 × 10−12 erg cm−2 s−1 in the 0.1–2.4 keV band. The sample, called the ROSAT Brightest Cluster Sample (BCS), is selected from ROSAT All‐Sky Survey data and is the largest X‐ray‐selected cluster sample compiled to date. In addition to Abell clusters, which form the bulk of the sample, the BCS also contains the X‐ray‐brightest Zwicky clusters and other clusters selected from their X‐ray properties alone. Effort has been made to ensure the highest possible completeness of the sample and the smallest possible contamination by non‐cluster X‐ray sources. X‐ray fluxes are computed using an algorithm tailored for the detection and characterization of X‐ray emission from galaxy clusters. These fluxes are accurate to better than 15 per cent (mean 1σ error). We find the cumulative log N–log S distribution of clusters to follow a power law κSα with α = 1.31+0.06−0.03 (errors are the 10th and 90th percentiles) down to fluxes of 2 × 10−12 erg cm−2 s−1, i.e. considerably below the BCS flux limit. Although our best‐fitting slope disagrees formally with the canonical value of −1.5 for a Euclidean distribution, the BCS log N–log S distribution is consistent with a non‐evolving cluster population if cosmological effects are taken into account. Our sample will allow us to examine large‐scale structure in the northern hemisphere, determine the spatial cluster–cluster correlation function, investigate correlations between the X‐ray and optical properties of the clusters, establish the X‐ray luminosity function for galaxy clusters, and discuss the implications of the results for cluster evolution.

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Section: The X-ray Database †mentioning

confidence: 99%

The ROSAT Brightest Cluster Sample -- I. The compilation of the sample and the cluster log N--log S distribution

Ebeling

Edge

Böhringer

et al. 1998

Monthly Notices of the Royal Astronomical Society

644

761

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“…There are three main differences with respect to the early sliding‐box search methods (e.g. Gioia et al 1990; Cruddace et al 1991): the background is estimated from the whole field rather than from the edges of the detection aperture; a maximum‐likelihood ratio technique assuming Poisson fluctuations (Cash 1979), rather than Gaussian, is used; and the data are compared with a model profile of the PSF to assess the significance of any possible source. The change in background subtraction reduces the chance of missing extended sources because they artificially increase the background estimate.…”

Section: Constructing the X‐ray Cluster Samplementioning

confidence: 99%

The Southern SHARC catalogue: a ROSAT survey for distant galaxy clusters

Burke

Collins

Sharples

et al. 2003

Monthly Notices of the Royal Astronomical Society

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X‐ray selection provides a way of creating well‐defined samples of distant clusters free from projection effects and with a well‐understood selection function. This paper describes the creation of one such catalogue – the Southern Serendipitous High‐redshift Archival ROSAT Cluster (SHARC) survey – which covers an area of 17.7 deg2 and consists of 32 clusters with redshifts between 0.05 and 0.7 and X‐ray luminosities between 7 × 1042 and 4 × 1044 erg s−1: the high‐redshift subsample contains 16 clusters with z≥ 0.3 and X‐ray luminosities greater than 2 × 1043 erg s−1 (luminosities are quoted for the 0.5–2.0 keV energy band). The catalogue is in good agreement with those of other ROSAT cluster surveys for those fields in common. The high‐redshift sample is consistent with there being no evolution in the cluster X‐ray luminosity function at luminosities ∼1044 erg s−1: the implications of this work have been described elsewhere.

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“…The 2 PSPCs on board ROSAT were the instruments in use for the entire RASS. Descriptions of the observing methods employed during the survey, as well as the data reduction techniques, can be found in Cruddace et al (1991).…”

Section: The Samplementioning

confidence: 99%

F, G and K stars in the ROSAT all-sky survey

Metanomski

Pasquini

Krautter³

et al. 1998

Astron. Astrophys. Suppl. Ser.

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Abstract. We present accurate BV (RI) c photometry for a sample of F, G and K stars detected in selected areas of the ROSAT all-sky survey (RASS). We have used the photometry, in addition to low-resolution spectroscopy, to estimate spectral classifications, distances and X-ray luminosities. The log(L X /L V ) in the sample lies below −2. Although the sample contains also nearby, inactive stars, it is dominated by active objects. The median X-ray luminosity in our sample is < L X >= 29.88 and the mean value of the hardness ratios < HR1 >= 0.13 ± 0.35.We compare the derived X-ray luminosity function with similar functions obtained from the serendipitous samples of the Einstein Observatory medium sensitivity survey (EMSS) and EXOSAT.Our sample is completely consistent with the EMSS sample of solar type stars, indicating that both our sources and the EMSS sources are representative of the high galactic latitude X-ray stellar population. We do not find extremely active stars (log(L X ) ≥ 32), as are found in the EMSS sample, and we argue that these objects are rare.

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Simulated ROSAT observations of clusters of galaxies

Cited by 15 publications

References 13 publications

The ROSAT Brightest Cluster Sample -- I. The compilation of the sample and the cluster log N--log S distribution

The ROSAT Brightest Cluster Sample -- I. The compilation of the sample and the cluster log N--log S distribution

The Southern SHARC catalogue: a ROSAT survey for distant galaxy clusters

F, G and K stars in the ROSAT all-sky survey

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