47 research outputs found
The impact of being homeless on the unsuccessful outcome of treatment of pulmonary TB in São Paulo State, Brazil
Evaluation of the extent of interstitial fibrosis in oral squamous cell carcinoma compared with normal oral mucosa and oral epithelial dysplasia.
Association between MTHFR gene 1298A>C polymorphism and breast cancer susceptibility: a meta-analysis based on 38 case-control studies with 40,985 subjects
Planck 2015 results I. Overview of products and scientific results
The European Space Agency's Planck satellite, which is dedicated to studying the early Universe and its subsequent evolution, was launched on 14 May 2009. It scanned the microwave and submillimetre sky continuously between 12 August 2009 and 23 October 2013. In February 2015, ESA and the Planck Collaboration released the second set of cosmology products based on data from the entire Planck mission, including both temperature and polarization, along with a set of scientific and technical papers and a web-based explanatory supplement. This paper gives an overview of the main characteristics of the data and the data products in the release, as well as the associated cosmological and astrophysical science results and papers. The data products include maps of the cosmic microwave background (CMB), the thermal Sunyaev-Zeldovich effect, diffuse foregrounds in temperature and polarization, catalogues of compact Galactic and extragalactic sources (including separate catalogues of Sunyaev-Zeldovich clusters and Galactic cold clumps), and extensive simulations of signals and noise used in assessing uncertainties and the performance of the analysis methods. The likelihood code used to assess cosmological models against the Planck data is described, along with a CMB lensing likelihood. Scientific results include cosmological parameters derived from CMB power spectra, gravitational lensing, and cluster counts, as well as constraints on inflation, non-Gaussianity, primordial magnetic fields, dark energy, and modified gravity, and new results on low-frequency Galactic foregrounds
Sunyaev-Zel'dovich profile fitting with joint AMI-Planck analysis
We develop a Bayesian method of analysing Sunyaev-Zel'dovich measurements of
galaxy clusters obtained from the Arcminute Microkelvin Imager (AMI) radio
interferometer system and from the Planck satellite, using a joint likelihood
function for the data from both instruments. Our method is applicable to any
combination of Planck data with interferometric data from one or more arrays.
We apply the analysis to simulated clusters and find that when the cluster
pressure profile is known a-priori, the joint dataset provides precise and
accurate constraints on the cluster parameters, removing the need for external
information to reduce the parameter degeneracy. When the pressure profile
deviates from that assumed for the fit, the constraints become biased. Allowing
the pressure profile shape parameters to vary in the analysis allows an
unbiased recovery of the integrated cluster signal and produces constraints on
some shape parameters, depending on the angular size of the cluster. When
applied to real data from Planck-detected cluster PSZ2 G063.80+11.42, our
method resolves the discrepancy between the AMI and Planck -estimates and
usefully constrains the gas pressure profile shape parameters at intermediate
and large radii
Recommended from our members
A 15.5 GHz detection of the galaxy cluster minihalo in RXJ1720.1+2638
RXJ1720.1+2638 is a cool-core, 'relaxed-appearing' cluster with a minihalo
previously detected up to 8.4 GHz, confined by X-ray-detected cold fronts. We
present observations of the minihalo at 13 - 18 GHz with the Arcminute
Microkelvin Imager telescope, simultaneously modelling the Sunyaev-Zel'dovich
signal of the cluster in conjunction with Planck and Chandra data in order to
disentangle the non-thermal emission of the minihalo. We show that the
previously-reported steepening of the minihalo emission at 8.4 GHz is not
supported by the AMI data and that the spectrum is consistent with a single
power-law up to 18 GHz. We also show the presence of a larger-scale component
of the minihalo extending beyond the cold fronts. Both of these observations
could be explained by the 'hadronic' or 'secondary' mechanism for the
production of relativistic electrons, rather than the currently-favoured
're-acceleration' mechanism and/or multiple episodes of jet activity from the
active galactic nucleus in the brightest cluster galaxy