Emmanuel Schaan
A5029273290- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Relativity and Gravitational Theory
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Remote Sensing in Agriculture
- Geomagnetism and Paleomagnetism Studies
- Precipitation Measurement and Analysis
- CCD and CMOS Imaging Sensors
- Climate variability and models
- Ocular Infections and Treatments
Kavli Institute for Particle Astrophysics and Cosmology
2023-2025
SLAC National Accelerator Laboratory
2023-2025
Menlo School
2023-2025
Sofia University
2024
Stanford University
2023
Lawrence Berkeley National Laboratory
2018-2023
University of California, Berkeley
2018-2023
Columbia University
2023
University of Michigan–Ann Arbor
2023
Pontificia Universidad Católica de Chile
2021
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...
We present the temperature and polarization angular power spectra measured by Atacama Cosmology Telescope Polarimeter (ACTPol). analyze night-time data collected during 2013-14 using two detector arrays at 149 GHz, from 548 deg$^2$ of sky on celestial equator. use these spectra, with MBAC camera ACT 2008-10, in combination Planck WMAP to estimate cosmological parameters temperature, polarization, temperature-polarization cross-correlations. find new ACTPol be consistent LCDM model. The...
The imprint left on the cosmic microwave background (CMB) from CMB photons scattering off high-energy electrons in galaxies and clusters is known as Sunyaev-Zel'dovich (SZ) effect subject of these two papers Atacama Cosmology Telescope (ACT). ACT measurements combined with those Planck BOSS are shown to provide a rich picture electron gas thermodynamics galactic cluster medium. This can be used test improve cosmological simulations relevant for upcoming experiments.
Abstract We present tomographic measurements of structure growth using cross-correlations Atacama Cosmology Telescope (ACT) DR6 and Planck cosmic microwave background (CMB) lensing maps with the unWISE Blue Green galaxy samples, which span redshift ranges 0.2 ≲ z 1.1 0.3 1.8, respectively. improve on prior not just by making use new, high-precision ACT maps, but also including additional spectroscopic data for calibration analyzing our a more flexible theoretical model. determine amplitude...
Abstract We investigate the impact and mitigation of extragalactic foregrounds for cosmic microwave background (CMB) lensing power spectrum analysis Atacama Cosmology Telescope (ACT) data release 6 (DR6) data. Two independent sky simulations are used to test a range strategies. demonstrate that finding then subtracting point sources, models clusters, using profile bias-hardened estimator together reduce fractional biases well below statistical uncertainties, with inferred amplitude, A lens ,...
We use microwave temperature maps from two seasons of data the Atacama Cosmology Telescope (ACTPol) at 146 GHz, together with Constant Mass CMASS galaxy sample Baryon Oscillation Spectroscopic Survey to measure kinematic Sunyaev-Ze\v{l}dovich (kSZ) effect over redshift range z = 0.4 - 0.7. positions and continuity equation obtain a reconstruction line-of-sight velocity field. stack cosmic background location each halo, weighted by corresponding reconstructed velocity. The resulting best fit...
The thermal and kinematic Sunyaev-Zel'dovich effects (tSZ, kSZ) probe the thermodynamic properties of circumgalactic intracluster medium (CGM ICM) galaxies, groups, clusters, since they are proportional, respectively, to integrated electron pressure momentum along line-of-sight. We present constraints on gas thermodynamics CMASS galaxies in Baryon Oscillation Spectroscopic Survey (BOSS) using new measurements kSZ tSZ signals obtained a companion paper. Combining measurements, we measure...
Optimal analyses of many signals in the cosmic microwave background (CMB) require map-level extraction individual components sky, rather than measurements at power spectrum level alone. To date, nearly all component separation CMB has been performed exclusively using satellite data. In this paper, we implement a method based on internal linear combination (ILC) approach which have designed to optimally account for anisotropic noise (in 2D Fourier domain) often found ground-based experiments....
This paper presents a maximum-likelihood algorithm for combining sky maps with disparate coverage, angular resolution and spatially varying anisotropic noise into single map of the sky. We use this to merge hundreds individual covering 2008-2018 ACT observing seasons, resulting in by far deepest released so far. also combine full Planck maps, that have best features both ACT: Planck's nearly white on intermediate large scales ACT's high-resolution sensitivity small scales. The cover over...
Extragalactic foregrounds are known to generate significant biases in temperature-based cosmic microwave background (CMB) lensing reconstruction. Several techniques, which include ``source hardening'' and ``shear-only estimators'' have been proposed mitigate contamination shown be very effective at reducing foreground-induced biases. Here we extend both techniques polarization, will an essential component of CMB reconstruction for future experiments, investigate the ``large-lens'' limit...
We present a new measurement of the kinematic Sunyaev-Zel'dovich effect using data from Atacama Cosmology Telescope (ACT) and Baryon Oscillation Spectroscopic Survey (BOSS). Using 600 square degrees overlapping sky area, we evaluate mean pairwise baryon momentum associated with positions 50,000 bright galaxies in BOSS DR11 Large Scale Structure catalog. A non-zero signal arises large-scale motions halos containing sample galaxies. The fits an analytical model well, optical depth to microwave...
The cosmic microwave background (CMB) energy spectrum is a near-perfect blackbody. standard model of cosmology predicts small spectral distortions to this form, but no such distortion the sky-averaged CMB has yet been measured. We calculate largest expected distortion, which arises from inverse Compton scattering photons off hot, free electrons, known as thermal Sunyaev-Zel'dovich (TSZ) effect. show that predicted signal roughly one order magnitude below current bound COBE-FIRAS experiment,...
The next-generation weak lensing surveys (i.e., LSST, Euclid, and WFIRST) will require exquisite control over systematic effects. In this paper, we address shear calibration present the most realistic forecast to date for LSST/Euclid/WFIRST CMB from a stage 4 experiment (``CMB S4''). We use cosmolike code simulate joint analysis of all two-point functions galaxy density, shear, convergence. include full Gaussian non-Gaussian covariances explore resulting likelihood with Monte Carlo Markov...
Cosmic microwave background (CMB) lensing from current and upcoming wide-field CMB experiments such as AdvACT, SPT-3G Simons Observatory relies heavily on temperature (versus polarization). In this regime, foreground contamination to the map produces significant biases, which cannot be fully controlled by multifrequency component separation, masking, or bias hardening. Letter, we split standard quadratic estimator into a new set of optimal ``multipole'' estimators. On large scales, these...
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...
Abstract Line intensity mapping (LIM) is a rapidly emerging technique for constraining cosmology and galaxy formation using multi-frequency, low angular resolution maps. Many LIM applications crucially rely on cross-correlations of two line maps, or maps with surveys galaxy/CMB lensing. We present consistent halo model to predict all these enable joint analyses, in 3D redshift-space 2D projected extend the conditional luminosity function formalism multi-line case, consistently account...
A key challenge for current and upcoming cosmic microwave background lensing measurements is their sensitivity to biases from extragalactic foregrounds, such as Sunyaev-Zel'dovich signals or infrared emission. Several methods have been developed mitigate these foreground biases, dividing broadly into multifrequency cleaning approaches modifications the estimator geometry, but how optimally combine has not yet explored in detail. In this paper, we examine which combination of mitigation...
Peculiar velocities of galaxies and halos can be reconstructed from their spatial distribution alone. This technique is analogous to the baryon acoustic oscillations reconstruction, using continuity equation connect density velocity fields. The resulting used measure imprints galaxy on cosmic microwave background like kinematic Sunyaev-Zel'dovich effect or moving lens effect. As precision these measurements increases, characterizing performance reconstruction becomes crucial allow unbiased...
Reconstructing the galaxy peculiar velocity field from distribution of large-scale structure plays an important role in cosmology. On one hand, it gives us insight into formation and gravity; on other, allows to selectively extract kinetic Sunyaev-Zel'dovich (kSZ) effect cosmic microwave background maps. In this work, we employ high-accuracy synthetic catalogs light cone investigate how well can recover when utilizing three-dimensional spatial galaxies a modern experiment such as Dark Energy...
We study the mapping from Lagrangian to Eulerian space in context of Effective Field Theory (EFT) Large Scale Structure. compute displacements with Perturbation (LPT) and perform full non-perturbative transformation displacement density. When expanded up a given order, this reproduces standard (SPT) at same order. However, density also includes higher order terms. These terms explicitly resum long wavelength motions, thus making resulting field better correlated true non-linear field. As...
SPHEREx is a proposed NASA MIDEX mission selected for Phase A study. would carry out the first all-sky spectral survey in near infrared. At end of its two-year mission, obtain 0.75-to-5$\mu$m spectra every 6.2 arcsec pixel on sky, with resolution R>35 and 5-$\sigma$ sensitivity AB$>$19 per spectral/spatial element. More details concerning are available at http://spherex.caltech.edu. The team has three specific science investigations to be carried this unique data set: cosmic inflation,...
SPHEREx is a proposed SMEX mission selected for Phase A. will carry out the first all-sky spectral survey and provide every 6.2" pixel spectra between 0.75 4.18 $\mu$m [with R$\sim$41.4] 5.00 R$\sim$135]. The team has three specific science investigations to be carried with this unique data set: cosmic inflation, interstellar circumstellar ices, extra-galactic background light. It readily apparent, however, that many other questions in astrophysics planetary sciences could addressed data....
Extragalactic foregrounds in temperature maps of the cosmic microwave background (CMB) severely limit ability standard estimators to reconstruct weak lensing potential. These are not fully removable by multifrequency cleaning or masking and can lead large biases if properly accounted for. For made a number unclustered point sources, an estimator for source amplitude be derived deprojected, removing any bias reconstruction. We show with simulations that all extragalactic approximated...