Search Publications
SZ effects in the Magneticum Pathfinder simulation: comparison with the Planck, SPT, and ACT results
Sunyaev, R.; Dolag, K.; Komatsu, E.
We calculate the one-point probability density distribution functions (PDF) and the power spectra of the thermal and kinetic Sunyaev-Zeldovich (tSZ and kSZ) effects and the mean Compton Y parameter using the Magneticum Pathfinder simulations, state-of-the-art cosmological hydrodynamical simulations of a large cosmological volume of (896 Mpc h…
Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT
Benoit-Lévy, A.; Efstathiou, G.; D'Andrea, C. B. +82 more
We detect the kinematic Sunyaev-Zel'dovich (kSZ) effect with a statistical significance of 4.2σ by combining a cluster catalogue derived from the first year data of the Dark Energy Survey with cosmic microwave background temperature maps from the South Pole Telescope Sunyaev-Zel'dovich Survey. This measurement is performed with a differential stat…
An all-sky support vector machine selection of WISE YSO candidates
McGehee, P.; Paladini, R.; Kun, M. +4 more
We explored the AllWISE catalogue of the Wide-field Infrared Survey Explorer (WISE) mission and identified Young Stellar Object (YSO) candidates. Reliable 2MASS and WISE photometric data combined with Planck dust opacity values were used to build our data set and to find the best classification scheme. A sophisticated statistical method, the suppo…
Interstellar extinction curve variations towards the inner Milky Way: a challenge to observational cosmology
Valenti, Elena; Wolf, Christian; Udalski, Andrzej +18 more
We investigate interstellar extinction curve variations towards ∼4 deg2 of the inner Milky Way in VIJKs photometry from the OGLE-III (third phase of the Optical Gravitational Lensing Experiment) and VVV (VISTA Variables in the Via Lactea) surveys, with supporting evidence from diffuse interstellar bands and F435W, F625W photo…
LoCuSS: Testing hydrostatic equilibrium in galaxy clusters
Finoguenov, A.; Smith, G. P.; Okabe, N. +17 more
We test the assumption of hydrostatic equilibrium in an X-ray luminosity selected sample of 50 galaxy clusters at 0.15 < z < 0.3 from the Local Cluster Substructure Survey (LoCuSS). Our weak-lensing measurements of M500 control systematic biases to sub-4 per cent, and our hydrostatic measurements of the same achieve excellent agre…
Measuring the dynamical state of Planck SZ-selected clusters: X-ray peak - BCG offset
Bersanelli, M.; Maino, D.; Rossetti, M. +6 more
We want to characterize the dynamical state of galaxy clusters detected with the Sunyaev-Zeldovich (SZ) effect by Planck and compare them with the dynamical state of clusters selected in X-rays survey. We analysed a representative subsample of the Planck SZ catalogue, containing the 132 clusters with the highest signal to noise ratio and character…
A deep XMM-Newton study of the hot gaseous halo around NGC 1961
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We examine 11 XMM-Newton observations of the giant spiral galaxy NGC 1961, allowing us to study the hot gaseous halo of a spiral galaxy in unprecedented detail. We perform a spatial and a spectral analysis; with the former, the hot halo is detected to at least 80 kpc and with the latter its properties can be measured in detail up to 42 kpc. We fin…
Thermal SZ fluctuations in the ICM: probing turbulence and thermodynamics in Coma cluster with Planck
Khatri, Rishi; Gaspari, Massimo
We report the detection of thermal Sunyaev-Zeldovich (SZ) effect fluctuations in the intracluster medium (ICM) of Coma cluster observed with Planck. The SZ data links the maximum observable X-ray scale to the large Mpc scale, extending our knowledge of the power spectrum of ICM fluctuations. Deprojecting the 2D SZ perturbations into 3D pressure fl…
Constraining gravity at the largest scales through CMB lensing and galaxy velocities
Ho, Shirley; Alam, Shadab; Pullen, Anthony R. +1 more
We demonstrate a new method to constrain gravity on the largest cosmological scales by combining measurements of cosmic microwave background (CMB) lensing and the galaxy velocity field. EG is a statistic, constructed from a gravitational lensing tracer and a measure of velocities such as redshift-space distortions (RSD), that can discri…
Bayesian model selection without evidences: application to the dark energy equation-of-state
Hobson, M. P.; Lasenby, A. N.; Hee, S. +1 more
A method is presented for Bayesian model selection without explicitly computing evidences, by using a combined likelihood and introducing an integer model selection parameter n so that Bayes factors, or more generally posterior odds ratios, may be read off directly from the posterior of n. If the total number of models under consideration is speci…