Pedro Fluxá
A5044024768- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Radio, Podcasts, and Digital Media
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
Pontificia Universidad Católica de Chile
2015-2024
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert Chile that promises to provide breakthrough discoveries fundamental physics, cosmology, and astrophysics. Supported by Foundation, Heising-Simons with contributions from collaborating institutions, SO will see first light 2021 start five year survey 2022. has 287 collaborators 12 countries 53 including 85 students 90 postdocs. its currently funded form...
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...
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....
Abstract The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background (CMB) over 75% of sky from Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures large angular scale (1° ≲ θ 90°) CMB polarization to constrain tensor-to-scalar ratio r ∼ 0.01 level optical depth last scattering sample variance limit. This paper presents characterization 40 GHz during its first observation era, 2016...
Abstract The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background over 75% of sky from Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. This paper describes CLASS data pipeline maps for 40 GHz observations conducted 2016 August to 2022 May. We demonstrate how well survey strategy, with rapid (∼10 Hz) front-end modulation, recovers large-scale Galactic polarization signal ground: mapping transfer...
The search for inflationary primordial gravitational waves and the measurement of optical depth to reionization, both through their imprint on large angular scale correlations in polarization cosmic microwave background (CMB), has created need high sensitivity measurements across fractions sky at millimeter wavelengths. These are subject instrumental atmospheric 1=f noise, which motivated development modulators facilitate rejection these systematic effects. Variable-delay (VPMs) used...
The Cosmology Large Angular Scale Surveyor (CLASS) is a four-telescope array observing the largest angular scales ($2 \lesssim \ell 200$) of cosmic microwave background (CMB) polarization. These encode information about reionization and inflation during early universe. instrument stability necessary to observe these from ground achieved through use variable-delay polarization modulator (VPM) as first optical element in each CLASS telescopes. Here we develop demodulation scheme used extract...
The Cosmology Large Angular Scale Surveyor (CLASS) is mapping the polarization of Cosmic Microwave Background (CMB) at large angular scales ($2<\ell\lesssim200$) in search a primordial gravitational wave B-mode signal down to tensor-to-scalar ratio $r \approx 0.01$. same data set will provide near sample-variance-limited measurement optical depth reionization. Between June 2016 and March 2018, CLASS completed largest ground-based Q-band CMB survey date, covering over 31 000~square-degrees...
The Cosmology Large Angular Scale Surveyor consists of four instruments performing a CMB polarization survey. Currently, the 40 GHz and first 90 are deployed observing, with second multichroic 150/220 instrument to follow. receiver is central component each instrument's design functionality. This paper describes CLASS design, using as primary reference. Cryogenic cooling filters maintain cold, low-noise environment for detectors. We have achieved detector temperatures below 50mK in 85%...
Abstract We report measurements of circular polarization from the first two years observation with 40 GHz polarimeter Cosmology Large Angular Scale Surveyor (CLASS). CLASS is conducting a multi-frequency survey covering 75% sky Atacama Desert designed to measure cosmic microwave background (CMB) linear E and B on angular scales 1° ≲ θ ≤ 90°, corresponding multipole range 2 ℓ 200. The modulation technology enabling at largest ground, Variable-delay Polarization Modulator, uniquely provide...
Cosmic microwave background experiments have experienced an exponential increase in complexity, data size and sensitivity. One of the goals current future is to characterize B-mode power spectrum, which would be considered a strong evidence supporting inflation. The signal associated with inflationary B-modes very weak, so successful detection requires exquisite control over systematic effects, several might arise due interaction between electromagnetic properties telescope beam, scanning...
The Earth's magnetic field induces Zeeman splitting of the dipole transitions molecular oxygen in atmosphere, which produces polarized emission millimeter-wave regime. This is primarily circularly and manifests as a foreground with dipole-shaped sky pattern for polarization-sensitive ground-based cosmic microwave background experiments, such Cosmology Large Angular Scale Surveyor (CLASS), capable measuring large angular scale circular polarization. Using atmospheric theory radiative transfer...
Abstract The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background (CMB) over ∼75% of sky from Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures large angular scale CMB polarization to constrain tensor-to-scalar ratio optical depth last scattering. This paper presents characterization 90 GHz telescope. Observations Moon establish pointing while dedicated observations Jupiter are used...
Telescopes for observing the Cosmic Microwave Background (CMB) usually have shields and baffle structures in order to reduce pickup from ground. These may introduce unwanted sidelobes. We present a method measure model baffling of large aperture telescope optics predict sidelobe pattern.
The Cosmology Large Angular Scale Surveyor (CLASS) is an array of polarization-sensitive millimeter wave telescopes that observes ~70% the sky at frequency bands centered near 40GHz, 90GHz, 150GHz, and 220GHz from Atacama desert northern Chile. Here, we describe architecture software used to control telescopes, acquire data various instruments, schedule observations, monitor status instruments create archival packages, transfer packages North America for analysis. computer network CLASS...
The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background over 75\% of sky from Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220~GHz. This paper describes CLASS data pipeline maps for 40~GHz observations conducted August 2016 to May 2022. We demonstrate how well survey strategy, with rapid ($\sim10\,\mathrm{Hz}$) front-end modulation, recovers large-scale Galactic polarization signal ground: mapping...
Measurement of the largest angular scale ($\ell < 30$) 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 $40\,\mathrm{GHz}$ channel Cosmology Large Angular Scale Surveyor (CLASS) 2016 August 2022 May. Taking advantage measurement stability enabled by front-end modulation excellent conditions...
The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background (CMB) over ~75% of sky from Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures large angular scale CMB polarization to constrain tensor-to-scalar ratio optical depth last scattering. This paper presents characterization 90GHz telescope, which has been observing since July 2018. Observations Moon establish pointing while dedicated...
The search for inflationary primordial gravitational waves and the measurement of optical depth to reionization, both through their imprint on large angular scale correlations in polarization cosmic microwave background (CMB), has created need high sensitivity measurements across fractions sky at millimeter wavelengths. These are subject instrumental atmospheric $1/f$ noise, which motivated development modulators facilitate rejection these systematic effects. Variable-delay (VPMs) used...