A5081880362- Planetary Science and Exploration
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Stellar, planetary, and galactic studies
- Spacecraft Design and Technology
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Space exploration and regulation
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Marine and environmental studies
- Spaceflight effects on biology
- Rocket and propulsion systems research
- Origins and Evolution of Life
- Geothermal Energy Systems and Applications
University of Chicago
2016-2025
Goddard Space Flight Center
2023-2024
Massachusetts Institute of Technology
2023-2024
Planetary Science Institute
2015-2023
University of California, Davis
2021-2023
University of California, Berkeley
2015-2021
Berkeley College
2019-2021
Lawrence Berkeley National Laboratory
2015
University of Colorado Boulder
2010-2013
Laboratory for Atmospheric and Space Physics
2010
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 a catalog of 689 galaxy cluster candidates detected at significance $\xi>4$ via their thermal Sunyaev-Zel'dovich (SZ) effect signature in 95 and 150 GHz data from the 500-square-degree SPTpol survey. use optical infrared Dark Energy Camera Wide-field Infrared Survey Explorer (WISE) Spitzer satellites, to confirm 544 these as clusters with $\sim94\%$ purity. The sample has an approximately redshift-independent mass threshold redshift $z>0.25$ spans $1.5 \times 10^{14} < M_{500c} 9...
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...
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 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...
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.
We describe the observations and resultant galaxy cluster catalog from 2770 deg2 SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via Sunyaev–Zel'dovich (SZ) effect confirmed with a combination of archival targeted follow-up data, making particular use data Dark Energy (DES). With incomplete we have as clusters 244 266 candidates at detection significance ξ ≥ 5 an additional 204 systems 4 < 5. The sample has median mass redshift z = 0.49, 44 strong gravitational lenses in...
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....
Abstract Impacts may have had a significant effect on the atmospheric chemistry of early Earth. Reduced phases in impactor (e.g., metallic iron) can reduce planet’s H 2 O inventory to produce massive atmospheres rich . While previous studies focused interactions between and atmosphere such scenarios, we investigate two further effects: (1) distribution impactor’s iron during impact target interior, atmosphere, escaping target; (2) post-impact impact-generated melt phase. We find that these...
Abstract The formation and evolution of the South Pole‐Aitken (SPA) basin is critical to relating large impact modification lunar geophysical evolution. Most prior models SPA were conducted in 2D, making it difficult compare model output 3D crustal structure ejecta distribution. In order better constrain parameters impactor expected post distribution crust ejecta, we numerical simulations 3D. We tested a wide range constrained results with recent data. found best fit by an oblique (30–45°)...
We present measurements of E-mode polarization and temperature-E-mode correlation in the cosmic microwave background using data from first season observations with SPTpol, polarization-sensitive receiver currently installed on South Pole Telescope (SPT). The used this work cover 100 sky arcminute resolution at 150 GHz. report angular auto-power spectrum (EE) cross-power (TE) over multipole range 500 < ℓ ≤ 5000. These power spectra improve previous high-ℓ (small-scale) regime. fit combination...
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...
Abstract Late accretion onto the Hadean Earth included large impacts that could have influenced early habitability, either by sterilizing planet or alternatively catalyzing origin of life delivering iron required to create a reducing environment/atmosphere. We present 3D numerical simulations 1500–3400 km diameter on in order quantify their effects planetary habitability. find impact events require larger projectiles than previously assumed, with 2000–2700 impactor completely melt Earth’s...
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...
We present cosmological constraints from the abundance of galaxy clusters selected via thermal Sunyaev-Zel'dovich (SZ) effect in South Pole Telescope (SPT) data with a simultaneous mass calibration using weak gravitational lensing Dark Energy Survey (DES) and Hubble Space (HST). The cluster sample is constructed combined SPT-SZ, SPTpol ECS, 500d surveys, comprises 1,005 confirmed redshift range $0.25-1.78$ over total sky area 5,200 deg$^2$. use DES Year 3 weak-lensing for 688 redshifts...
We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process reducing gravitational-lensing generated component will become increasingly important for improving searches B modes produced by primordial gravitational waves. In this work, we delens maps constructed from multi-frequency SPTpol observations 90 deg$^2$ patch sky subtracting template two inputs: E-mode and lensing potential map estimated $\textit{Herschel}$...
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 have observed emission lines of [S iv] 10.51, H(7–6) 12.37, [Ne ii] 12.81, iii] 15.56 and 18.71 μm in a number extragalactic H ii regions with theSpitzer Space Telescope. A previous paper presented our data analysis for the substantially face-on spiral galaxy M83. Here we report results Local Group M33. The nebulae selected cover wide range galactocentric radii (RG). observations were made Infrared Spectrograph short wavelength, high-resolution module. above set five is cospatially, thus...