A5054340866- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Relativity and Gravitational Theory
- Scientific Research and Discoveries
- Radiomics and Machine Learning in Medical Imaging
- Particle Detector Development and Performance
- MRI in cancer diagnosis
- Climate variability and models
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
Stanford University
2016-2025
Kavli Institute for Particle Astrophysics and Cosmology
2015-2024
Menlo School
2008-2024
University of Chicago
2012-2019
SLAC National Accelerator Laboratory
2008-2019
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Goddard Space Flight Center
2010-2012
Cornell University
2003
Studies of galaxy clusters have proved crucial in helping to establish the standard model cosmology, with a universe dominated by dark matter and energy. A theoretical basis that describes as massive, multi-component, quasi-equilibrium systems is growing its capability interpret multi-wavelength observations expanding scope sensitivity. We review current cosmological results, including contributions fundamental physics, obtained from clusters. These results are consistent complementary those...
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
This book lays out the scientific goals to be addressed by next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned consist of dedicated telescopes at South Pole, high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies crossing critical thresholds in search for B-mode polarization signature primordial gravitational waves, determination number...
(Abridged) This is the first of a series papers in which we derive simultaneous constraints on cosmological parameters and X-ray scaling relations using observations growth massive, flux-selected galaxy clusters. Our data set consists 238 clusters drawn from ROSAT All-Sky Survey, incorporates extensive follow-up Chandra Observatory. Here describe implement new statistical framework required to self-consistently produce cosmology such data, present results models dark energy. In spatially...
(Abridged) This is the second in a series of papers which we derive simultaneous constraints on cosmology and X-ray scaling relations using observations massive, flux-selected galaxy clusters. The data set consists 238 clusters drawn from ROSAT All-Sky Survey with 0.1-2.4 keV luminosities >2.5e44 erg/second, incorporates extensive follow-up Chandra Observatory. Our analysis accounts self-consistently for all selection effects, covariances systematic uncertainties. Here describe reduction...
We employ robust weak gravitational lensing measurements to improve cosmological constraints from of the galaxy cluster mass function and its evolution, using X-ray selected clusters detected in ROSAT All-Sky Survey. Our analysis constrains absolute scale such at 8 per cent level, including both statistical systematic uncertainties. Combining it with survey data follow-up observations, we find a tight constraint on combination mean matter density late-time normalization power spectrum,...
The Suzaku satellite provides a census of the gas, metals, and dark matter out to outskirts Perseus Cluster.
We report weak-lensing masses for 51 of the most X-ray luminous galaxy clusters known. This cluster sample, introduced earlier in this series papers, spans redshifts 0.15 < z_cl 0.7, and is well suited to calibrate mass proxies current cosmology experiments. Cluster are measured with a standard `color-cut' lensing method from three-filter photometry each field. Additionally, 27 fields at least five-filter photometry, we measure high-accuracy using new that exploits all information available...
We present the XXL Survey, largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The Survey covers two extragalactic areas 25 deg2 each at a point-source sensitivity ~ 5E-15 erg/sec/cm2 in [0.5-2] keV band (completeness limit). survey's main goals are provide constraints on dark energy equation state from space-time distribution clusters galaxies serve as pathfinder for future, wide-area X-ray missions. review science objectives,...
This is the first in a series of papers which we measure accurate weak-lensing masses for 51 most X-ray luminous galaxy clusters known at redshifts 0.15<z<0.7, order to calibrate and other mass proxies cosmological cluster experiments. The primary aim improve absolute calibration observables, currently dominant systematic uncertainty count Key elements this work are rigorous quantification uncertainties, high-quality data reduction photometric calibration, "blind" nature analysis avoid...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
We present a catalog of galaxy cluster candidates, selected through their Sunyaev–Zel'dovich (SZ) effect signature in the first 720 deg2 South Pole Telescope (SPT) survey. This area was mapped with SPT 2008 and 2009 austral winters to depth ∼18 μKCMB-arcmin at 150 GHz; 550 it also ∼44 95 GHz. Based on optical imaging all 224 candidates near-infrared majority we have found and/or infrared counterparts for 158, which then classify as confirmed clusters. Of these 158 clusters, 135 were...
This is the second in a series of papers studying astrophysics and cosmology massive, dynamically relaxed galaxy clusters. The data set employed here consists Chandra observations 40 such clusters, identified comprehensive search archive for hot (kT ≳ 5舁keV), morphologically systems, as well high-quality weak gravitational lensing subset these Here we present cosmological constraints from measurements gas mass fraction,舁 fgas, this cluster sample. By incorporating robust calibration X-ray...
In light of the tension in cosmological constraints reported by Planck team between their Sunyaev–Zel'dovich-selected cluster counts and Cosmic Microwave Background (CMB) temperature anisotropies, we compare mass estimates with robust, weak-lensing measurements from Weighing Giants (WtG) project. For 22 clusters common cosmology sample WtG, find an overall ratio 〈MPlanck/MWtG〉 = 0.688 ± 0.072. Extending to not used analysis yields a consistent value 0.698 0.062 38 common. Identifying masses...
We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray to constrain cosmological parameters. present a statistical method that fits for scaling relations of SZ and observables mass while jointly fitting cosmology. The is generalizable multiple observables, self-consistently accounts effects selection uncertainties calibration on derived constraints. apply this data set consisting an SZ-selected catalog 18 galaxy clusters at z...
We constrain the mass–richness scaling relation of redMaPPer galaxy clusters identified in Dark Energy Survey Year 1 data using weak gravitational lensing. split into 4 × 3 bins richness λ and redshift |$z$| for ≥ 20 0.2 ≤ 0.65 measure mean masses these their stacked lensing signal. By modelling as 〈M200m|λ, |$z$|〉 = M0(λ/40)F((1 + |$z$|)/1.35)G, we normalization at 5.0 per cent level, finding M0 [3.081 ± 0.075(stat) 0.133(sys)] · 1014 M⊙ 40 0.35. The recovered index is F 1.356 0.051 (stat)...
We present first results on the cooling properties derived from Chandra X-ray observations of 83 high-redshift (0.3 < z 1.2) massive galaxy clusters selected by their Sunyaev–Zel'dovich signature in South Pole Telescope data. measure each cluster's central time, entropy, and mass deposition rate, compare these to those for local cluster samples. find no significant evolution ∼ 0 1 distribution properties, suggesting that cores is stable over long periods time. also average cool core entropy...
We present a statistically complete sample of very X-ray luminous galaxy clusters detected in the MAssive Cluster Survey (MACS). This second MACS release comprises all 34 with nominal fluxes excess 2x10^(-12) erg/s/cm^2 (0.1-2.4 keV) ROSAT Bright Source Catalogue; two thirds them are new discoveries. Extending over redshift range from 0.3 to 0.5, this subset complements 12 most distant (z>0.5) published 2007 and further exemplifies efficacy selection for compilation samples intrinsically...
We present constraints on the mean matter density, Omega_m, normalization of density fluctuation power spectrum, sigma_8, and dark-energy equation-of-state parameter, w, obtained from measurements X-ray luminosity function largest known galaxy clusters at redshifts z<0.7, as compiled in Massive Cluster Survey (MACS) local BCS REFLEX cluster samples. Our analysis employs an observed mass-luminosity relation, calibrated by hydrodynamical simulations, including corrections for non-thermal...
We present constraints on the scaling relations of galaxy cluster X-ray luminosity, temperature and gas mass (and derived quantities) with redshift, employing masses from robust weak gravitational lensing measurements. These are first such results obtained an analysis that simultaneously accounts for selection effects underlying function, directly incorporates data to constrain total masses. Our their intrinsic scatters in good agreement previous studies, reinforce a picture which departures...
The abundance of massive galaxy clusters is a powerful probe departures from General Relativity (GR) on cosmic scales. Despite current stringent constraints placed by stellar and galactic tests, larger scales alternative theories gravity such as $f(R)$ can still work effective theories. Here we present two popular models $f(R)$, Hu-Sawicki "designer", derived fully self-consistent analysis samples X-ray selected accounting for all the covariances between cosmological astrophysical...
We derive cosmological constraints using a galaxy cluster sample selected from the 2500~deg$^2$ SPT-SZ survey. The spans redshift range $0.25< z<1.75$ and contains 343 clusters with SZ detection significance $\xi>5$. is supplemented optical weak gravitational lensing measurements of 32 $0.29<z<1.13$ (from Magellan HST) X-ray 89 $0.25<z<1.75$ Chandra). rely on minimal modeling assumptions: i) provides an accurate means measuring halo masses, ii) mean observables are related to true mass...
ABSTRACT We implement the first blind analysis of cluster abundance data to derive cosmological constraints from and weak lensing signal redMaPPer clusters in Sloan Digital Sky Survey (SDSS). simultaneously fit for parameters richness–mass relation clusters. For a flat Λ cold dark matter model with massive neutrinos, we find $S_8 \equiv \sigma _{8}(\Omega _\mathrm{ m}/0.3)^{0.5}=0.79^{+0.05}_{-0.04}$. This value is both consistent competitive that derived catalogues selected different...