期刊
ASTROPHYSICAL JOURNAL
卷 738, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/738/1/48
关键词
galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
资金
- National Science Foundation [ANT-0638937]
- NSF Physics Frontier Center [PHY-0114422]
- Kavli Foundation
- Gordon and Betty Moore Foundation
- NASA through Chandra X-ray Observatory Center [GO0-11143]
- NASA [NAS8-03060, NNX09AQ04G, 2834-MIT-SAO-4018]
- Chandra Award [AR0-11015A]
- DFG The Dark Universe [TRR33]
- Excellence Cluster Universe
- National Sciences and Engineering Research Council of Canada
- Quebec Fonds de recherche sur la nature et les technologies
- Canadian Institute for Advanced Research
- Brinson Foundation
- KICP
- Clay Fellowship
- Hubble Fellowship [HF-51259.01-A]
- Alfred P. Sloan Research Fellowship
- Keck Foundation
- NASA [108845, NNX09AQ04G] Funding Source: Federal RePORTER
- STFC [ST/G002711/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009012] Funding Source: National Science Foundation
We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background from the thermal Sunyaev-Zel'dovich (SZ) effect. These clusters are a subset of the first SZ-selected cluster catalog, obtained from observations of 178 deg(2) of sky surveyed by the South Pole Telescope (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T-X, and mass, M-g, of the intracluster medium within r(500) for each cluster. From these, we calculate Y-X = MgTX and estimate the total cluster mass using an M-500-Y-X scaling relation measured from previous X-ray studies. The integrated Comptonization, Y-SZ, is derived from the SZ measurements, using additional information from the X-ray-measured gas density profiles and a universal temperature profile. We calculate scaling relations between the X-ray and SZ observables and find results generally consistent with other measurements and the expectations from simple self-similar behavior. Specifically, we fit a Y-SZ-Y-X relation and find a normalization of 0.82 +/- 0.07, marginally consistent with the predicted ratio of Y-SZ/Y-X = 0.91 +/- 0.01 that would be expected from the density and temperature models used in this work. Using the Y-X-derived mass estimates, we fit a Y-SZ-M-500 relation and find a slope consistent with the self-similar expectation of Y-SZ proportional to M-5/3 with a normalization consistent with predictions from other X-ray studies. We find that the SZ mass estimates, derived from cosmological simulations of the SPT survey, are lower by a factor of 0.78 +/- 0.06 relative to the X-ray mass estimates. This offset is at a level of 1.3 sigma when considering the similar to 15% systematic uncertainty for the simulation-based SZ masses. Overall, the X-ray measurements confirm that the scaling relations of the SZ-selected clusters are consistent with the properties of other X-ray-selected samples of massive clusters, even allowing for the broad redshift range (0.29 < z < 1.08) of the sample.
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