Thomas Essinger-Hileman
A5055672328- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Microwave Engineering and Waveguides
- Dark Matter and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Aerogels and thermal insulation
- Photonic and Optical Devices
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Advanced Thermodynamic Systems and Engines
- History and Developments in Astronomy
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Silicone and Siloxane Chemistry
- Antenna Design and Optimization
Goddard Space Flight Center
2009-2025
Johns Hopkins University
2012-2023
Sigma Space (United States)
2020-2021
University of Maryland, College Park
2020-2021
Université Toulouse III - Paul Sabatier
2020
Centre National de la Recherche Scientifique
2020
Kavli Institute for the Physics and Mathematics of the Universe
2020
Stockholm University
2020
High Energy Accelerator Research Organization
2020
Sapienza University of Rome
2020
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from Atacama Cosmology Telescope, using data taken 2013-2016 at 98 150 GHz. The cover more than 17,000 deg$^2$, deepest 600 deg$^2$ with noise levels below 10 $\mu$K-arcmin. use power spectrum derived almost 6,000 these to constrain cosmology. ACT enable a measurement angular scale features in both divergence-like anisotropy, tracing velocity density last-scattering. From one...
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz 218 made by the Atacama Cosmology Telescope (ACT) in three seasons of observations 2008 to 2010. A model primary secondary foreground is fit map power spectra lensing deflection spectrum, including contributions both thermal Sunyaev-Zeldovich (tSZ) effect kinematic (kSZ) effect, Poisson correlated anisotropy unresolved infrared sources, radio correlation between tSZ...
We present cosmological parameters derived from the angular power spectrum of cosmic microwave background (CMB) radiation observed at 148 GHz and 218 over 296 deg2 with Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations scales 500 < ℓ 10, 000. fit a model for lensed CMB, Sunyaev–Zel'dovich (SZ), foreground contribution to spectra, including thermal kinetic SZ, Poisson radio infrared point sources, clustered sources. At = 3000, about half comes primary CMB...
We present the temperature and polarization angular power spectra of CMB measured by Atacama Cosmology Telescope (ACT) from 5400 deg$^2$ 2013-2016 survey, which covers $>$15000 at 98 150 GHz. For this analysis we adopt a blinding strategy to help avoid confirmation bias and, related this, show numerous checks for systematic error done before unblinding. Using likelihood cosmological constrain secondary sources anisotropy foreground emission, derive "CMB-only" spectrum that extends...
We report the first detection of gravitational lensing cosmic microwave background through a measurement four-point correlation function in temperature maps made by Atacama Cosmology Telescope. verify our calculating levels potential contaminants and performing number null tests. The resulting convergence power spectrum at 2° angular scales measures amplitude matter density fluctuations on comoving length around 100 Mpc redshifts 0.5 to 3. measured signal agrees with Lambda cold dark...
Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
Abstract LiteBIRD, the Lite (Light) satellite for study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission primordial cosmology fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as strategic large-class (L-class) mission, with an expected launch late 2020s using JAXA’s H3 rocket. planned to orbit Sun–Earth Lagrangian point L2, where it will map microwave over entire sky three years, telescopes 15...
We report on 23 clusters detected blindly as Sunyaev–ZEL'DOVICH (SZ) decrements in a 148 GHz, 455 deg2 map of the southern sky made with data from Atacama Cosmology Telescope 2008 observing season. All SZ detections announced this work have confirmed optical counterparts. Ten are new discoveries. One newly discovered cluster, ACT-CL J0102−4915, redshift 0.75 (photometric), has an decrement comparable to most massive systems at lower redshifts. Simulations cluster recovery method reproduce...
The Atacama Cosmology Telescope was designed to measure small-scale anisotropies in the Cosmic Microwave Background and detect galaxy clusters through Sunyaev-Zel'dovich effect. instrument is located on Cerro Toco Desert, at an altitude of 5190 meters. A six-meter off-axis Gregorian telescope feeds a new type cryogenic receiver, Millimeter Bolometer Array Camera. receiver features three 1000-element arrays transition-edge sensor bolometers for observations 148 GHz, 218 277 GHz. Each detector...
We present measurements of the cosmic microwave background (CMB) power spectrum made by Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well cross-frequency between two channels. Our results clearly show second through seventh acoustic peaks in CMB spectrum. The these higher-order provide an additional test {\Lambda}CDM cosmological model. At l > 3000, we detect excess primary anisotropy CMB. lower multipoles 500 < find evidence for gravitational lensing 2.8{\sigma} level. also a low...
We present constraints on cosmological parameters based a sample of Sunyaev-Zel'dovich-selected galaxy clusters detected in millimeter-wave survey by the Atacama Cosmology Telescope. The cluster used this analysis consists 9 optically-confirmed high-mass comprising high-significance end total identified 455 square degrees sky surveyed during 2008 at 148 GHz. focus most massive systems to reduce degeneracy between unknown astrophysics and cosmology derived from SZ surveys. describe scaling...
The Cosmology Large Angular Scale Surveyor (CLASS) is an experiment to measure the signature of a gravitationalwave background from inflation in polarization cosmic microwave (CMB). CLASS multi-frequency array four telescopes operating high-altitude site Atacama Desert Chile. will survey 70% sky frequency bands centered at 38, 93, 148, and 217 GHz, which are chosen straddle Galactic-foreground minimum while avoiding strong atmospheric emission lines. This broad coverage ensures that can...
For the first time, measurements of cosmic microwave background radiation (CMB) alone favor cosmologies with $w=\ensuremath{-}1$ dark energy over models without at a 3.2-sigma level. We demonstrate this by combining CMB lensing deflection power spectrum from Atacama Cosmology Telescope temperature and polarization spectra Wilkinson Microwave Anisotropy Probe. The data break geometric degeneracy different cosmological similar spectra. Our CMB-only measurement density...
We present constraints on the primordial power spectrum of adiabatic fluctuations using data from 2008 Southern Survey Atacama Cosmology Telescope (ACT). The angular resolution ACT provides sensitivity to scales beyond \ell = 1000 for multiple peaks in temperature spectrum, which enables us probe scalar perturbations with wavenumbers up k \simeq 0.2 Mpc^{-1}. find no evidence deviation power-law over two decades scale. Matter inferred evolve cosmic time and can be used predict matter at late...
The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting an imaging polarimeter operating in frequency bands between 20 800 GHz. We describe the science achievable by PICO, which has sensitivity equivalent to more than 3300 Planck missions, technical implementation, schedule cost.
Abstract Measurement of the largest angular scale ( ℓ < 30) features cosmic microwave background (CMB) polarization is a powerful way to constrain optical depth reionization and search for signature inflation through detection primordial B -modes. We present an analysis maps covering 73.6% sky made from 40 GHz channel Cosmology Large Angular Scale Surveyor (CLASS) 2016 August 2022 May. Taking advantage measurement stability enabled by front-end modulation excellent conditions Atacama...
We present a measurement of the angular power spectrum cosmic microwave background (CMB) radiation observed at 148 GHz. The uses maps with 1.4' resolution made data from Atacama Cosmology Telescope (ACT). observations cover 228 square degrees southern sky, in 4.2-degree-wide strip centered on declination 53 South. CMB arcminute scales is particularly sensitive to Silk damping scale, Sunyaev-Zel'dovich (SZ) effect galaxy clusters, and emission by radio sources dusty galaxies. After masking...
We present optical and X-ray properties for the first confirmed galaxy cluster sample selected by Sunyaev–Zel'dovich effect (SZE) from 148 GHz maps over 455 deg2 of sky made with Atacama Cosmology Telescope (ACT). These maps, coupled multi-band imaging on 4 m class telescopes, have yielded a 23 clusters redshifts between 0.118 1.066. Of these clusters, 10 are newly discovered. The selection this is approximately mass limited essentially independent redshift. provide positions, images,...
We present a description of the data reduction and mapmaking pipeline used for 2008 observing season Atacama Cosmology Telescope (ACT). The presented here at 148 GHz represent 12% 90 TB collected by ACT from 2007 to 2010. In we observed 136 days, producing total 1423 hours (11 band only), with daily average 10.5 observation. From these, 1085 were devoted 850 deg^2 stripe (11.2 9.1 deg) centered on declination -52.7 deg, while 175 280 (4.5 4.8 celestial equator. discuss sources statistical...
We evaluate the modulation of Cosmic Microwave Background (CMB) polarization using a rapidly-rotating, half-wave plate (HWP) on Atacama B-Mode Search (ABS). After demodulating time-ordered-data (TOD), we find significant reduction atmospheric fluctuations. The demodulated TOD is stable time scales 500-1000 seconds, corresponding to frequencies 1-2 mHz. This facilitates recovery cosmological information at large angular scales, which are typically available only from balloon-borne or...
The Cosmology Large Angular Scale Surveyor (CLASS) is a four telescope array designed to characterize relic primordial gravitational waves from in ation and the optical depth reionization through measurement of polarized cosmic microwave background (CMB) on largest angular scales. frequencies CLASS telescopes, one at 38 GHz, two 93 dichroic system 145/217 are chosen avoid spectral regions high atmospheric emission span minimum Galactic foregrounds: synchrotron lower dust higher frequencies....
A millimeter-wave survey over half the sky, that spans frequencies in range of 30 to 350 GHz, and is both an order magnitude deeper higher-resolution than currently funded surveys would yield enormous gain understanding fundamental physics astrophysics. By providing such a deep, high-resolution (about 0.5 uK-arcmin noise 15 arcsecond resolution at 150 GHz), CMB-HD will enable major advances. It allow 1) use gravitational lensing primordial microwave background map distribution matter on...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...