L. M. Mocanu
A5055655553- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Advanced Differential Geometry Research
- Astronomical Observations and Instrumentation
- Field-Flow Fractionation Techniques
- Scientific Research and Discoveries
- Planetary Science and Exploration
- Refrigeration and Air Conditioning Technologies
- Calibration and Measurement Techniques
- Geomagnetism and Paleomagnetism Studies
- Statistical and numerical algorithms
- Spectroscopy and Laser Applications
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
University of Chicago
2014-2023
University of Oslo
2019-2022
Lawrence Berkeley National Laboratory
2015
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...
Gravitational lensing of the cosmic microwave background generates a curl pattern in observed polarization. This "B-mode" signal provides measure projected mass distribution over entire observable Universe and also acts as contaminant for measurement primordial gravity-wave signals. In this Letter we present first detection gravitational B modes, using first-season data from polarization-sensitive receiver on South Pole Telescope (SPTpol). We construct template B-mode by combining E-mode...
(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...
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 present measurements of the $E$-mode polarization angular auto-power spectrum ($EE$) and temperature-$E$-mode cross-power ($TE$) cosmic microwave background (CMB) using 150 GHz data from three seasons SPTpol observations. report power spectra over spherical harmonic multipole range $50 < \ell \leq 8000$, detect nine acoustic peaks in $EE$ with high signal-to-noise ratio. These are most sensitive to date $TE$ at $\ell > 1050$ 1475$, respectively. The observations cover 500 deg$^2$, a...
We present first results on the cooling properties derived from Chandra X-ray observations of 83 high-redshift (0.3 < z 1.2) massive galaxy clusters selected by their Sunyaev–Zel'dovich signature in South Pole Telescope data. measure each cluster's central time, entropy, and mass deposition rate, compare these to those for local cluster samples. find no significant evolution ∼ 0 1 distribution properties, suggesting that cores is stable over long periods time. also average cool core entropy...
We present measurements of secondary cosmic microwave background (CMB) anisotropies and infrared (CIB) fluctuations using data from the South Pole Telescope (SPT) covering complete 2540 sq.deg. SPT-SZ survey area. Data in three frequency bands centered at 95, 150, 220 GHz, are used to produce six angular power spectra (three single-frequency auto-spectra cross-spectra) multipole range 2000 < ell 11000 (angular scales 5' > \theta 1'). These most precise 2500 these frequencies. The main...
We present a velocity dispersion-based mass calibration of the South Pole Telescope Sunyaev-Zel'dovich effect survey (SPT-SZ) galaxy cluster sample. Using homogeneously selected sample 100 candidates from 720 deg2 along with 63 dispersion ($\sigma_v$) and 16 X-ray Yx measurements clusters, we simultaneously calibrate mass-observable relation constrain cosmological parameters. The calibrations using $\sigma_v$ are consistent at $0.6\sigma$ level, preferring ~16% higher masses. use full...
We present a measurement of the $B$-mode polarization power spectrum (the $BB$ spectrum) from 100 $\mathrm{deg}^2$ sky observed with SPTpol, polarization-sensitive receiver currently installed on South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 include data spectral bands centered at 95 150 GHz. report five bins multipole space, spanning range $300 \le \ell 2300$, for three combinations: GHz $\times$ GHz, subtract small ($< 0.5 \sigma$ units...
We present a point source catalog from 771 square degrees of the South Pole Telescope Sunyaev Zel'dovich (SPT-SZ) survey at 95, 150, and 220 GHz. detect 1545 sources above 4.5 sigma significance in least one band. Based on their relative brightness between bands, we classify into two populations, dominated by synchrotron emission active galactic nuclei, thermal dust-enshrouded star-forming galaxies. find 1238 307 dusty sources. cross-match all against external catalogs 189 unidentified The...
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...
We present the results of ground- and space-based optical near-infrared (NIR) follow-up 224 galaxy cluster candidates detected with Sunyaev-Zel'dovich (SZ) effect in 720 deg^2 South Pole Telescope (SPT) survey completed 2008 2009 observing seasons. use optical/NIR data to establish whether each candidate is associated an overdensity galaxies estimate redshift. Most photometric redshifts are derived through a combination three different redshift estimators using red-sequence galaxies,...
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...
Abstract We present component-separated maps of the primary cosmic microwave background/kinematic Sunyaev–Zel’dovich (SZ) amplitude and thermal SZ Compton- y parameter, created using data from South Pole Telescope (SPT) Planck satellite. These maps, which cover ∼2500 deg 2 southern sky imaged by SPT-SZ survey, represent a significant improvement over previous such products available in this region virtue their higher angular resolution ( <?CDATA $1\buildrel{\,\prime}\over{.} 25$?> <mml:math...
We present Atacama Large Millimeter/submillimeter Array (ALMA) 860 micrometer imaging of four high-redshift (z=2.8-5.7) dusty sources that were detected using the South Pole Telescope (SPT) at 1.4 mm and are not seen in existing radio to far-infrared catalogs. At 1.5 arcsec resolution, ALMA data reveal multiple images each submillimeter source, separated by 1-3 arcsec, consistent with strong lensing intervening galaxies visible near-IR these sources. describe a gravitational lens modeling...
We present optical spectroscopy of galaxies in clusters detected through the Sunyaev–Zel'dovich (SZ) effect with South Pole Telescope (SPT). report our own measurements 61 spectroscopic cluster redshifts, and 48 velocity dispersions each calculated more than 15 member galaxies. This catalog also includes 19 SPT-observed previously reported literature. The majority this paper are SPT-discovered; these, most have been other SPT catalogs, five here as discoveries for first time. By performing a...
Clusters of galaxies are expected to gravitationally lens the cosmic microwave background (CMB) and thereby generate a distinct signal in CMB on arcminute scales. Measurements this effect can be used constrain masses galaxy clusters with data alone. Here we present measurement lensing by using from South Pole Telescope (SPT). We develop maximum likelihood approach extract cluster validate method mock data. quantify effects our analysis several potential sources systematic error find that...
We present a measurement of the cosmic microwave background (CMB) gravitational lensing potential using data from first two seasons observations with SPTpol, polarization-sensitive receiver currently installed on South Pole Telescope (SPT). The used in this work cover 100 deg$^2$ sky arcminute resolution at 150 GHz. Using quadratic estimator, we make maps CMB combinations temperature and polarization maps. combine these to form minimum-variance (MV) map. is measured signal-to-noise ratio...
(Abridged) We present the results of an X-ray analysis 80 galaxy clusters selected in 2500 deg^2 South Pole Telescope survey and observed with Chandra Observatory. divide full sample into subsamples ~20 based on redshift central density, performing fit to all a subsample simultaneously, assuming self-similarity temperature profile. This approach allows us constrain shape profile over 0<r<1.5R500, which would be impossible per-cluster basis, since observations individual have, average, 2000...
Abstract The Planck cosmic microwave background temperature data are best fit with a ΛCDM model that mildly contradicts constraints from other cosmological probes. South Pole Telescope (SPT) 2540 <?CDATA ${\deg }^{2}$?> SPT-SZ survey offers measurements on sub-degree angular scales (multipoles $650\leqslant {\ell }\leqslant 2500$?> ) sufficient precision to use as an independent check of the data. Here we build recent joint analysis and in Hou et al. by comparing parameter estimates using...