J. G. S. Lunde
A5066975362- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Scientific Research and Discoveries
- Atmospheric and Environmental Gas Dynamics
- Space Exploration and Technology
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Computational Physics and Python Applications
- Particle physics theoretical and experimental studies
- Precipitation Measurement and Analysis
- Ionosphere and magnetosphere dynamics
- Big Data Technologies and Applications
University of Oslo
2021-2024
University of Helsinki
2023
University of Milan
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...
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 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...
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 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 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,...
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 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...
Abstract We present a new upper limit on the cosmic molecular gas density at z = 2.4–3.4 obtained using first year of observations from CO Mapping Array Project (COMAP). COMAP data cubes are stacked 3D positions 243 quasars selected Extended Baryon Oscillation Spectroscopic Survey (eBOSS) catalog, yielding 95% for flux CO(1–0) line emission 0.129 Jy km s −1 . Depending balance between quasar host and its environment, this value can be interpreted as an average luminosity <?CDATA...
We present updated constraints on the cosmological 3D power spectrum of carbon monoxide CO(1--0) emission in redshift range $2.4$--$3.4$. The are derived from two first seasons Carbon monOxide Mapping Array Project (COMAP) Pathfinder line intensity mapping observations aiming to trace star formation during epoch galaxy assembly. These results improve previous Early Science through both increased data volume and an improved processing methodology. On methodological side, we now perform...
We revisit the impact of finite time responses bolometric detectors used for deep observations cosmic microwave background (CMB). Until now, bolometer transfer functions have been accounted through a two-step procedure by first deconvolving an estimate their Fourier-space representation from raw time-ordered data (TOD), and then averaging deconvolved TOD into pixelized maps. However, many experiments, including Planck High Frequency Instrument (HFI), it is necessary to apply additional...
Anomalous Microwave Emission (AME) is a major component of Galactic emission in the frequency band 10 to 60 GHz and commonly modelled as rapidly rotating spinning dust grains. The photodissociation region (PDR) at boundary $\lambda$-Orionis Hii has been identified by several recent analyses one brightest emitting sources sky. We investigate Barnard 30 dark cloud, cloud embedded within PDR. use total-power observations from CO Mapping Array Project (COMAP) pathfinder instrument 26 34GHz with...
We revisit the impact of finite time responses bolometric detectors used for deep observations cosmic microwave background (CMB). Until now, bolometer transfer functions have been accounted through a two-step procedure by first deconvolving an estimate their Fourier-space representation from raw time-ordered data (TOD), and then averaging deconvolved TOD into pixelized maps. However, many experiments, including Planck High Frequency Instrument (HFI), it is necessary to apply additional...
We derive new constraints on the CIB monopole spectrum from reprocessed COBE-DIRBE sky maps with lower instrumental and astrophysical contamination than legacy DIRBE maps. These have been generated through a global Bayesian analysis framework that simultaneously fits cosmological, astrophysical, parameters, described in series of papers referred to as Cosmoglobe DR2. applied this method Calibrated Individual Observations, complemented by selected HFI FIRAS break key degeneracies, well WISE...
We present updated constraints on the cosmological 3D power spectrum of carbon monoxide CO(1-0) emission in redshift range $2.4$-$3.4$. The are derived from two first seasons Carbon monOxide Mapping Array Project (COMAP) Pathfinder line-intensity mapping observations aiming to trace star-formation during Epoch Galaxy Assembly. These results improve previous Early Science (ES) through both increased data volume and improved processing methodology. On methodological side, we now perform...
The CO Mapping Array Project (COMAP) Pathfinder is performing line intensity mapping of emission to trace the distribution unresolved galaxies at redshift $z \sim 3$. We present an improved version COMAP data processing pipeline and apply this first two seasons observations. This analysis improves on Early Science (ES) results in several key aspects. On observational side, all second season scans were made constant-elevation mode, after noting that previous Lissajous associated with...
The Carbon monOxide Mapping Array Project (COMAP) Pathfinder survey continues to demonstrate the feasibility of line-intensity mapping using high-redshift carbon monoxide (CO) line emission traced at cosmological scales. latest COMAP power spectrum analysis is based on observations through end Season 2, covering first three years operations. We use our constraints CO(1-0) $z\sim3$ update corresponding clustering CO and thus cosmic molecular gas content a key epoch galaxy assembly. mirror...
We present the first global Bayesian analysis of time-ordered DIRBE data within Cosmoglobe framework, building on same methodology that has previously been successfully applied to Planck LFI and WMAP. These are analyzed jointly with COBE-FIRAS, Gaia, HFI, WISE, allowing for more accurate instrumental astrophysical characterization than possible through single-experiment analysis. This paper provides an overview pipeline main results, we characterize a new set zodiacal light subtracted...
The CO Mapping Array Project (COMAP) Pathfinder is performing line intensity mapping of emission to trace the distribution unresolved galaxies at redshift z ∼ 3. We present an improved version COMAP data processing pipeline and apply it first two Seasons observations. This analysis improves on Early Science (ES) results in several key aspects. On observational side, all second season scans were made constant-elevation mode, after noting that previous Lissajous associated with increased...