A5089374149- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Black Holes and Theoretical Physics
- Superconducting and THz Device Technology
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
The University of Melbourne
2017-2025
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 present a measurement of the cosmic microwave background lensing potential using 500 deg 2 150 GHz data from SPTpol receiver on South Pole Telescope. The is reconstructed with signal-to-noise per mode greater than unity at multipoles L ≲ 250, quadratic estimator combination temperature and polarization maps. report measurements power spectrum in multipole range 100 < 2000 sets temperature-only ( T ), polarization-only (POL), minimum-variance (MV) estimators. measure amplitude...
We report a B-mode power spectrum measurement from the cosmic microwave background (CMB) polarization anisotropy observations made using SPTpol instrument on South Pole Telescope. This work uses 500 deg$^2$ of data, five-fold increase over last release. As result, bandpower uncertainties have been reduced by more than factor two, and extends to lower multipoles: $52 < \ell 2301$. Data both 95 150 GHz are used, allowing for three cross-spectra: x GHz, GHz. is detected at very high...
Abstract We present cosmological constraints based on the cosmic microwave background (CMB) lensing potential power spectrum measurement from recent 500 deg 2 SPTpol survey, most precise CMB ground to date. fit a flat ΛCDM model reconstructed alone and in addition with other data sets: baryon acoustic oscillations (BAO), as well primary spectra Planck . The band powers are good agreement when analyzed combination full-sky data. With weak priors density parameters, provide 4% constraint...
We present a catalog of galaxy cluster candidates detected in 100 square degrees surveyed with the SPTpol receiver on South Pole Telescope. The contains 89 signal-to-noise ratio greater than 4.6. are selected using Sunyaev-Zel'dovich effect at 95 and 150 GHz. Using both space- ground-based optical infrared telescopes, we have confirmed 81 as clusters. use these follow-up images archival to estimate photometric redshifts for 66 clusters spectroscopic observations obtain 13 systems. An...
The authors report on a search for cosmic birefringence in region of the southern sky, with South Pole Telescope. They reconstruct map polarization rotation anisotropies and measure angular power spectrum map, finding it to be consistent zero. This non detection is used place constraints strength primordial magnetic fields coupling constant electromagnetic Chern-Simons term.
Abstract We perform the first simultaneous Bayesian parameter inference and optimal reconstruction of gravitational lensing cosmic microwave background (CMB), using 100 deg 2 polarization observations from SPTpol receiver on South Pole Telescope. These data reach noise levels as low 5.8 μ K arcmin in polarization, which are enough that typically used quadratic estimator (QE) technique for analyzing CMB is significantly suboptimal. Conversely, procedure extracts all information at any level....
Clusters of galaxies gravitationally lens the cosmic microwave background (CMB) radiation, resulting in a distinct imprint CMB on arcminute scales. Measurement this effect offers promising way to constrain masses galaxy clusters, particularly those at high redshift. We use maps from South Pole Telescope Sunyaev–Zel'dovich (SZ) survey measure lensing signal around clusters identified optical imaging first year observations Dark Energy Survey. The cluster catalogue used analysis contains 3697...
We present a constraint on the tensor-to-scalar ratio, $r$, derived from measurements of cosmic microwave background (CMB) polarization $B$-modes with "delensing," whereby uncertainty $r$ contributed by sample variance gravitational lensing is reduced cross-correlating against $B$-mode template. This template constructed combining an estimate polarized CMB tracer projected large-scale structure. The large-scale-structure used map infrared Planck satellite data, while comes combination South...
We report results from an analysis aimed at detecting the trispectrum of kinematic Sunyaev-Zel'dovich (kSZ) effect by combining data South Pole Telescope (SPT) and Herschel-SPIRE experiments over a 100 deg^{2} field. The SPT observations combine previous current surveys, namely SPTpol SPT-3G, to achieve depths 4.5, 3, 16 μK-arcmin in bands centered 95, 150, 220 GHz. For SPIRE, we include 600 857 GHz bands. reconstruct velocity-induced large-scale correlation small-scale kSZ signal with...
Abstract We use cosmic microwave background (CMB) temperature maps from the 500 deg 2 SPTpol survey to measure stacked lensing convergence of galaxy clusters Dark Energy Survey (DES) Year-3 redMaPPer (RM) cluster catalog. The signal is extracted through a modified quadratic estimator designed be unbiased by thermal Sunyaev–Zel’dovich (tSZ) effect. uses tSZ-free map, constructed 95 and 150 GHz data sets, estimate CMB gradient. For reconstruction, we employ two versions RM catalog:...
We study the polarisation properties of extragalactic sources at 95 and 150 GHz in SPTpol 500 deg$^2$ survey. estimate polarised power by stacking maps known source positions, correct for noise bias subtracting mean random positions maps. show that method is unbiased using a set simulated with similar to real find flux-weighted mean-squared fraction $\langle p^2 \rangle= [8.9\pm1.1] \times 10^{-4}$ $[6.9\pm1.1] 150~GHz full sample. This consistent values obtained sub-sample active galactic...
We report the first detection of gravitational lensing due to galaxy clusters using only polarization cosmic microwave background (CMB). The signal is obtained a new estimator that extracts dipole signature from stacked images formed by rotating cluster-centered Stokes QU map cutouts along direction locally measured CMB gradient. Using data SPTpol 500 deg2 survey at locations roughly 18 000 with richness λ≥10 Dark Energy Survey (DES) Year-3 full cluster catalog, we detect 4.8σ. mean mass...
We report new measurements of millimeter-wave power spectra in the angular multipole range $2000 \le \ell 11,000$ (angular scales $5^\prime \gtrsim \theta 1^\prime$). By adding 95 and 150\,GHz data from low-noise 500 deg$^2$ SPTpol survey to SPT-SZ three-frequency 2540 survey, we substantially reduce uncertainties these bands. These include contributions primary cosmic microwave background, infrared radio galaxies, thermal kinematic Sunyaev-Zel'dovich (SZ) effects. The favor a SZ (tSZ) at...
Abstract Including millimeter-wave data in multiwavelength studies of the variability active galactic nuclei (AGN) can provide insights into AGN physics that are not easily accessible at other wavelengths. We demonstrate this work potential cosmic microwave background (CMB) telescopes to long-term, high-cadence monitoring over large fractions sky. report on a pilot study using from SPTpol instrument South Pole Telescope (SPT), which was designed observe CMB arcminute and larger angular...
We develop a Maximum Likelihood estimator (MLE) to measure the masses of galaxy clusters through impact gravitational lensing on temperature and polarization anisotropies cosmic microwave background (CMB). show that, at low noise levels in temperature, this optimal outperforms standard quadratic by factor two. For polarization, we that Stokes Q/U maps can be used instead traditional E- B-mode without losing information. test quantify bias recovered mass for comprehensive list potential...
We present spectroscopic confirmation of five galaxy clusters at $1.25 < \textit{z} 1.5$, discovered in the $2500$ deg$^{2}$ South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. These clusters, taken from a mass-limited sample with nearly redshift independent selection function, have multi-wavelength follow-up imaging data X-ray to near-infrared, and currently form most homogeneous massive high-redshift cluster known. identify $44$ member galaxies, along $25$ field among describe full...
Accurate galaxy cluster mass measurements from the gravitational lensing of cosmic microwave background temperature maps depend on mitigating potential biases cluster's own thermal Sunyaev-Zel'dovich (SZ) effect signal. Quadratic estimators use a pair to extract signal: large scale gradient map and small map. The SZ bias can be eliminated by using an SZ-free in pair, with being favored for signal-to-noise reasons. However, while this approach eliminates bias, power adds extra variance that...
A galaxy cluster's own Sunyaev-Zel'dovich (SZ) signal is known to be a major contaminant when reconstructing the underlying lensing potential using cosmic microwave background (CMB) temperature maps. In this work, we develop modified quadratic estimator (QE) that designed mitigate biases due kinematic and thermal SZ effects. The idea behind approach use inpainting technique eliminate emission from large-scale CMB gradient map. inpainted map, fill pixel values at cluster location based on...