H. T. Ihle
A5008395226- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Atmospheric and Environmental Gas Dynamics
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Climate variability and models
- Precipitation Measurement and Analysis
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Space Exploration and Technology
- Markov Chains and Monte Carlo Methods
- Statistical Methods and Inference
- Particle physics theoretical and experimental studies
- Advanced Differential Geometry Research
- Ionosphere and magnetosphere dynamics
- Advancements in Photolithography Techniques
University of Oslo
2015-2024
University of Milan
2023
University of Helsinki
2023
Imperial College London
2023
Abstract The CO Mapping Array Project (COMAP) aims to use line-intensity mapping of carbon monoxide (CO) trace the distribution and global properties galaxies over cosmic time, back Epoch Reionization (EoR). To validate technologies techniques needed for this goal, a Pathfinder instrument has been constructed fielded. Sensitive CO(1–0) emission from z = 2.4–3.4 fainter contribution CO(2–1) at 6–8, is surveying 12 deg 2 in 5 yr observing campaign detect signal ∼ 3. Using data first 13 months...
Warm dark matter cosmologies have been widely studied as an alternative to the cold paradigm, characteristic feature being a suppression of structure formation on small cosmological scales. A very similar situation occurs if standard particles are kept in local thermal equilibrium with a, possibly dark, relativistic species until Universe has cooled down keV temperatures. We perform systematic phenomenological study this possibility, and classify all minimal models containing arbitrary...
Abstract We present the current state of models for z ∼ 3 carbon monoxide (CO) line intensity signal targeted by CO Mapping Array Project (COMAP) Pathfinder in context its early science results. Our fiducial model, relating dark matter halo properties to luminosities, informs parameter priors with empirical galaxy–halo connection and previous (1–0) observations. The data spanning wavenumbers k = 0.051–0.62 Mpc −1 represent first direct 3D constraint on clustering component power spectrum....
We describe the computational infrastructure for end-to-end Bayesian CMB analysis implemented by BeyondPlanck collaboration. This code is called commander3, and provides a statistically consistent framework global of microwave observations, may be useful wide range legacy, current, future experiments. The paper has three main goals. Firstly, we provide high-level overview existing base, aiming to guide readers who wish extend adapt according their own needs, or reimplement it from scratch in...
We describe the BeyondPlanck project in terms of motivation, methodology and main products, provide a guide to set companion papers that each result fuller detail. implement complete end-to-end Bayesian analysis framework for Planck LFI observations. The primary product is full joint posterior distribution $P(\omega|d)$, where $\omega$ represents all free instrumental, astrophysical, cosmological parameters. Notable advantages this approach are seamless propagation uncertainties; accurate...
We introduce COMAP-EoR, the next generation of Carbon Monoxide Mapping Array Project aimed at extending CO intensity mapping to Epoch Reionization. COMAP-EoR supplements existing 30 GHz COMAP Pathfinder with two additional instruments and a new 16 receiver. This combination frequencies will be able simultaneously map CO(1--0) CO(2--1) reionization redshifts ($z\sim5-8$) in addition providing significant boost $z\sim3$ sensitivity Pathfinder. examine set models EoR signal, find power spectra...
Abstract We present the power spectrum methodology used for first-season COMAP analysis, and assess quality of current data set. The main results are derived through Feed–Feed Pseudo-Cross-Spectrum (FPXS) method, which is a robust estimator with respect to both noise modeling errors experimental systematics. use effective transfer functions take into account effects instrumental beam smoothing various filter operations applied during low-level processing. spectra estimated in this way have...
We present the intensity foreground algorithms and model employed within BeyondPlanck analysis framework. The is aimed at integrating component separation instrumental parameter sampling a global framework, leading to complete end-to-end error propagation in $Planck$ Low Frequency Instrument (LFI) data analysis. Given scope of analysis, limited set included process, degeneracies. In order properly constrain Galactic parameters, we improve upon previous $\texttt{Commander}$ implementation by...
We present posterior sample-based cosmic microwave background (CMB) constraints from Planck LFI and WMAP observations derived through global end-to-end Bayesian processing. use these samples to study correlations between CMB, foreground, instrumental parameters, we identify a particularly strong degeneracy CMB temperature fluctuations free-free emission on intermediate angular scales, which is mitigated model reduction, masking, resampling. compare our posterior-based results with previous...
Cosmic birefringence is a parity-violating effect that might have rotated the plane of linearly polarized light cosmic microwave background (CMB) by an angle $β$ since its emission. This has recently been measured to be non-zero at statistical significance $3.6σ$ in official Planck PR4 and 9-year WMAP data. In this work, we constrain using reprocessed BeyondPlanck LFI Cosmoglobe DR1 polarization maps. These novel maps both lower systematic residuals more complete error description than...
Line-intensity mapping (LIM or IM) is an emerging field of observational work, with strong potential to fit into a larger effort probe large-scale structure and small-scale astrophysical phenomena using multiple complementary tracers. Taking full advantage such complementarity means, in part, undertaking line-intensity surveys galaxy mind. We consider the for detection cross-correlation signal between COMAP blind based on photometric redshifts (as COSMOS) spectroscopic data HETDEX survey...
We present a Bayesian calibration algorithm for CMB observations as implemented within the global end-to-end BeyondPlanck (BP) framework, and apply this to Planck Low Frequency Instrument (LFI) data. Following most recent analysis, we decompose full time-dependent gain into sum of three orthogonal components: One absolute term, common all detectors; one time-independent term that can vary between component is allowed one-hour pointing periods. Each then sampled conditionally on other...
Line-intensity mapping observations will find fluctuations of integrated line emission are attenuated by varying degrees at small scales due to the width profiles. This attenuation may significantly impact estimates astrophysical or cosmological quantities derived from measurements. We consider a theoretical treatment effect broadening on both clustering and shot-noise components power spectrum generic line-intensity using halo model. then possible simplifications allow easier application in...
We discuss the treatment of bandpass and beam leakage corrections in Bayesian BeyondPlanck CMB analysis pipeline as applied to Planck LFI measurements. As a preparatory step, we first apply three nominal profiles including removal known systematic effect ground measuring equipment at 61 GHz; smoothing standing wave ripples; edge regularization. The main net impact these modifications is an overall shift 70 GHz +0.6 argue that any data products, either from or BeyondPlanck, should use new...
We describe the first season COMAP analysis pipeline that converts raw detector readouts to calibrated sky maps. This implements four main steps: gain calibration, filtering, data selection, and map-making. Absolute calibration relies on a combination of instrumental astrophysical sources, while relative exploits real-time total-power variations. High efficiency filtering is achieved through spectroscopic common-mode rejection within across receivers, resulting in nearly uncorrelated white...
We present early results from the COMAP Galactic Plane Survey conducted between June 2019 and April 2021, spanning $20^\circ<\ell<40^\circ$ in longitude $|b|<1.\!\!^{\circ}5$ latitude with an angular resolution of $4.5^{\prime}$. The full survey will span $\ell \sim 20^{\circ}$- $220^{\circ}$ be first large-scale radio continuum at $30$ GHz sub-degree resolution. initial part survey, including diffuse emission spectral energy distributions (SEDs) HII regions supernova remnants. Using low...
We present the first application of Cosmoglobe analysis framework by analyzing 9-year $\mathit{WMAP}$ time-ordered observations using similar machinery as BeyondPlanck utilizes for $\mathit{Planck}$ LFI. analyze only $\mathit Q$-band (41 GHz) data and report on low-level process from uncalibrated to calibrated maps. Most existing pipeline may be reused with minimal changes codebase. The main modification is implementation same preconditioned biconjugate gradient mapmaker used team. Producing...
We present Cosmoglobe Data Release 1, which implements the first joint analysis of WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end framework. This framework builds directly on similar measurements by BeyondPlanck collaboration, approaches CMB challenge through Gibbs sampling global posterior distribution, simultaneously accounting for calibration, mapmaking, component separation. The computational cost producing one complete WMAP+LFI sample is 812 CPU-hr,...
We present a Bayesian method for estimating instrumental noise parameters and propagating uncertainties within the global BeyondPlanck Gibbs sampling framework, apply this to Planck Low Frequency Instrument (LFI) time-ordered data. Following previous literature, we initially adopt $1/f$ model power spectral density (PSD), but find need an additional lognormal component in 30 44\,GHz bands. implement optimal Wiener-filter (or constrained realization) gap-filling procedure account masked then...
Line intensity mapping (LIM) is a new technique for tracing the global properties of galaxies over cosmic time. Detection very faint signals from redshifted carbon monoxide (CO), tracer star formation, pushes limits what feasible with total-power instrument. The CO Mapping Project (COMAP) Pathfinder first-generation instrument aiming to prove concept and develop technology future experiments, as well delivering early science products. With 19 receiver channels in hexagonal focal plane...
We present cosmological parameter constraints as estimated using the Bayesian BeyondPlanck (BP) analysis framework. This method supports seamless end-to-end error propagation from raw time-ordered data to final parameters. As a first demonstration of method, we analyze Planck LFI observations, combined with selected external (WMAP 33-61GHz, HFI DR4 353 and 857GHz, Haslam 408MHz) in form pixelized maps which are used break critical astrophysical degeneracies. Overall, all results generally...
We present the first model of full-sky polarized synchrotron emission that is derived from all WMAP and Planck LFI frequency maps. The basis this analysis set end-to-end reprocessed C OSMOGLOBE Data Release 1 (DR1) sky maps presented in a companion paper, which have significantly lower instrumental systematics than legacy products each experiment. find resulting amplitude map has an average noise rms per 2° full width at half maximum (FWHM) beam 3.2 μK 30 GHz. This 30% recently released B...
We constrain polarized foreground emission between 30 and 70 GHz with the Planck Low Frequency Instrument (LFI) WMAP data within global Bayesian BeyondPlanck framework. combine for first time full-resolution LFI time-ordered low-resolution sky maps at 33, 40 61 GHz. Spectral parameters are fit a likelihood defined native resolution of each frequency channel. This analysis represents implementation true multi-resolution component separation applied to CMB observations both amplitude spectral...
ABSTRACT We present the deconvolved distribution estimator (DDE), an extension of voxel intensity (VID), in context future observations proposed as part CO Mapping Array Project (COMAP). The DDE exploits fact that observed VID is a convolution correlated signal distributions and uncorrelated noise or interloper distributions. By deconvolving individual two observables away from their joint Fourier-space operation, suppresses sensitivity to emission while maintaining components. thus improves...
End-to-end simulations play a key role in the analysis of any high-sensitivity CMB experiment, providing high-fidelity systematic error propagation capabilities unmatched by other means. In this paper, we address an important issue regarding such simulations, namely how to define inputs terms sky model and instrument parameters. These may either be taken as constrained realization derived from data, or random independent data. We refer these Bayesian frequentist respectively. show that two...