Jonathan Sievers
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View article: CHIME/FRB Outriggers: Design Overview
CHIME/FRB Outriggers: Design Overview Open
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has emerged as the world’s premier facility for studying fast radio bursts (FRBs) through its fast transient search backend CHIME/FRB. The CHIME/FRB Outriggers project will augment…
View article: The thermodynamic structure and large-scale structure filament in MACS J0717.5+3745
The thermodynamic structure and large-scale structure filament in MACS J0717.5+3745 Open
We present the results of Chandra and XMM-Newton X-ray imaging and spatially resolved spectroscopy, along with new MUSTANG2 90 GHz observations of the thermal Sunyaev-Zeldovich (SZ) effect on MACS J0717.5+3745. This exceptionally massive (…
View article: Using the Antenna Impedance to Estimate Soil Electrical Parameters for the MIST Global 21 cm Experiment
Using the Antenna Impedance to Estimate Soil Electrical Parameters for the MIST Global 21 cm Experiment Open
Radio experiments trying to detect the global 21 cm signal from the early Universe are very sensitive to the electrical properties of their environment. For ground-based experiments with the antenna above the soil it is critical to charact…
View article: Forecasting the Fast Radio Burst Population Observed through Galaxy Cluster Lenses
Forecasting the Fast Radio Burst Population Observed through Galaxy Cluster Lenses Open
High-redshift fast radio bursts (FRBs) are expected to be extremely powerful probes of our Universe. However, while a significant number of FRBs are expected to exist at high redshift, detecting them has been difficult, with only a handful…
View article: Forecasting the FRB Population Observed Through Galaxy Cluster Lenses
Forecasting the FRB Population Observed Through Galaxy Cluster Lenses Open
High redshift Fast Radio Bursts (FRBs) are expected to be extremely powerful probes of our Universe. However, while a significant number of FRBs are expected to exist at high redshift, detecting them has been difficult, with only a handful…
View article: First Use of GPS Satellites for Beam Calibration of Radio Dish Telescopes
First Use of GPS Satellites for Beam Calibration of Radio Dish Telescopes Open
We present results from the first application of the Global Navigation Satellite System (GNSS; e.g., the Global Positioning System, GPS) for radio beam calibration using a commercial GNSS receiver with the Deep Dish Development Array (D3A)…
View article: The RAdio Galaxy Environment Reference Survey (RAGERS): Evidence of an anisotropic distribution of submillimeter galaxies in the 4C 23.56 protocluster at z=2.48
The RAdio Galaxy Environment Reference Survey (RAGERS): Evidence of an anisotropic distribution of submillimeter galaxies in the 4C 23.56 protocluster at z=2.48 Open
High-redshift radio(-loud) galaxies (H$z$RGs) are massive galaxies with powerful radio-loud active galactic nuclei (AGNs) and serve as beacons for protocluster identification. However, the interplay between H$z$RGs and the large-scale envi…
View article: Sensitive 3 mm Imaging of Discrete Sources in the Fields of Thermal Sunyaev–Zel’dovich Effect–Selected Galaxy Clusters
Sensitive 3 mm Imaging of Discrete Sources in the Fields of Thermal Sunyaev–Zel’dovich Effect–Selected Galaxy Clusters Open
In this paper, we present the results of a blind survey for compact sources in 243 Galaxy clusters that were identified using the thermal Sunyaev–Zel'dovich effect (tSZ). The survey was carried out at 90 GHz using MUSTANG2 on the Green Ban…
View article: Drone-Based Antenna Beam Calibration in the High Arctic
Drone-Based Antenna Beam Calibration in the High Arctic Open
The development of low-frequency radio astronomy experiments for detecting 21-cm line emission from hydrogen presents new opportunities for creative solutions to the challenge of characterizing an antenna beam pattern. The Array of Long Ba…
View article: Mapper of the IGM spin temperature: instrument overview
Mapper of the IGM spin temperature: instrument overview Open
The observation of the global 21 cm signal produced by neutral hydrogen gas in the intergalactic medium (IGM) during the Dark Ages, Cosmic Dawn, and Epoch of Reionization requires measurements with extremely well-calibrated wideband radiom…
View article: Erratum: “Inferences from Surface Brightness Fluctuations of Zwicky 3146 via the Sunyaev–Zel’dovich Effect and X-Ray Observations” (2023, ApJ, 951, 41)
Erratum: “Inferences from Surface Brightness Fluctuations of Zwicky 3146 via the Sunyaev–Zel’dovich Effect and X-Ray Observations” (2023, ApJ, 951, 41) Open
In the course of continuing work on surface brightness fluctuations the authors found an error in how the particle background was subtracted from XMM-Newton images. In particular, a slightly smoothed background image (used to generate Pois…
View article: The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids
The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids Open
We present fluxes and light curves for a population of asteroids at millimeter wavelengths, detected by the Atacama Cosmology Telescope (ACT) over 18,000 deg 2 of the sky using data from 2017 to 2021. We utilize high cadence maps, which ca…
View article: Sensitive 3mm Imaging of Discrete Sources in the Fields of tSZ-Selected Galaxy Clusters
Sensitive 3mm Imaging of Discrete Sources in the Fields of tSZ-Selected Galaxy Clusters Open
In this paper we present the results of a blind survey for compact sources in 243 Galaxy clusters that were identified using the thermal Sunyaev-Zeldovich effect (tSZ). The survey was carried out at 90 GHz using MUSTANG2 on the Green Bank …
View article: Simulating the Detection of the Global 21 cm Signal with MIST for Different Models of the Soil and Beam Directivity
Simulating the Detection of the Global 21 cm Signal with MIST for Different Models of the Soil and Beam Directivity Open
The Mapper of the IGM Spin Temperature (MIST) is a new ground-based, single-antenna, radio experiment attempting to detect the global 21 cm signal from the Dark Ages and Cosmic Dawn. A significant challenge in this measurement is the frequ…
View article: Simulating the Detection of the Global 21 cm Signal with MIST for Different Models of the Soil and Beam Directivity
Simulating the Detection of the Global 21 cm Signal with MIST for Different Models of the Soil and Beam Directivity Open
The Mapper of the IGM Spin Temperature (MIST) is a new ground-based, single-antenna, radio experiment attempting to detect the global 21 cm signal from the Dark Ages and Cosmic Dawn. A significant challenge in this measurement is the frequ…
View article: Mapper of the IGM spin temperature: instrument overview
Mapper of the IGM spin temperature: instrument overview Open
The observation of the global 21 cm signal produced by neutral hydrogen gas in the intergalactic medium (IGM) during the Dark Ages, Cosmic Dawn, and Epoch of Reionization requires measurements with extremely well-calibrated wideband radiom…
View article: Inferences from Surface Brightness Fluctuations of Zwicky 3146 via the Sunyaev–Zel’dovich Effect and X-Ray Observations
Inferences from Surface Brightness Fluctuations of Zwicky 3146 via the Sunyaev–Zel’dovich Effect and X-Ray Observations Open
The galaxy cluster Zwicky 3146 is a sloshing cool-core cluster at z = 0.291 that in Sunyaev–Zel’dovich (SZ) imaging does not appear to exhibit significant pressure substructure in the intracluster medium. We perform a surface brightness fl…
View article: GBT/MUSTANG-2 900 resolution imaging of the SZ effect in MS0735.6+7421
GBT/MUSTANG-2 900 resolution imaging of the SZ effect in MS0735.6+7421 Open
In the course of refactoring the code used to perform model fitting in Orlowski-Scherer et al. 2022, it was discovered that the beam size used was incorrect.MUSTANG-2 uses two concentric Gaussian beam profiles to represent the inner beam a…
View article: The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids
The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids Open
We present fluxes and light curves for a population of asteroids at millimeter (mm) wavelengths, detected by the Atacama Cosmology Telescope (ACT) over 18, 000 deg2 of the sky using data from 2017 to 2021. We utilize high cadence maps, whi…
View article: Inferences from surface brightness fluctuations of Zwicky 3146 via the Sunyaev-Zeldovich effect and X-ray observations
Inferences from surface brightness fluctuations of Zwicky 3146 via the Sunyaev-Zeldovich effect and X-ray observations Open
The galaxy cluster Zwicky 3146 is a sloshing cool core cluster at $z{=}0.291$ that in SZ imaging does not appear to exhibit significant pressure substructure in the intracluster medium (ICM). We perform a surface brightness fluctuation ana…
View article: MUSTANG-2 A401 + BRIDGE
MUSTANG-2 A401 + BRIDGE Open
Kelvin_RJ, Noise and SNR maps and associated data products of the galaxy cluster A401 and the filament between A401 and A399 as observed at 90 GHz with MUSTANG-2 on the GBT.
View article: Linking the dust and chemical evolution: Taurus and Perseus
Linking the dust and chemical evolution: Taurus and Perseus Open
Context. HCN, HNC, and their isotopologues are ubiquitous molecules that can serve as chemical thermometers and evolutionary tracers to characterize star-forming regions. Despite their importance in carrying information that is vital to st…
View article: GBT/MUSTANG-2 9″ resolution imaging of the SZ effect in MS0735.6+7421
GBT/MUSTANG-2 9″ resolution imaging of the SZ effect in MS0735.6+7421 Open
Context. Mechanical feedback from active galactic nuclei is thought to be the dominant feedback mechanism quenching cooling flows and star formation in galaxy cluster cores. It, in particular, manifests itself by creating cavities in the X…
View article: Antenna characterization for the HIRAX experiment
Antenna characterization for the HIRAX experiment Open
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) aims to improve constraints on the dark energy equation of state through measurements of large-scale structure at high redshift (0.8 < z < 2.5), while serving as a state-of-t…
View article: Antenna characterization for the HIRAX experiment
Antenna characterization for the HIRAX experiment Open
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) aims to improve constraints on the dark energy equation of state through measurements of large-scale structure at high redshift ($0.8$700MHz. Noise temperature measurements o…
View article: GBT/MUSTANG-2 9" resolution imaging of the SZ effect in MS0735.6+7421: Confirmation of the SZ Cavities through direct imaging
GBT/MUSTANG-2 9" resolution imaging of the SZ effect in MS0735.6+7421: Confirmation of the SZ Cavities through direct imaging Open
Mechanical feedback from active galactic nuclei (AGN) is thought to be the dominant feedback mechanism quenching cooling flows and star formation in galaxy cluster cores. However, the mechanisms by which AGN couple to the intracluster medi…
View article: A Bayesian approach to high fidelity interferometric calibration − II: demonstration with simulated data
A Bayesian approach to high fidelity interferometric calibration − II: demonstration with simulated data Open
In a companion paper, we presented bayescal, a mathematical formalism for mitigating sky-model incompleteness in interferometric calibration. In this paper, we demonstrate the use of bayescal to calibrate the degenerate gain parameters of …
View article: A Bayesian approach to high-fidelity interferometric calibration – I. Mathematical formalism
A Bayesian approach to high-fidelity interferometric calibration – I. Mathematical formalism Open
High-fidelity radio interferometric data calibration that minimizes spurious spectral structure in the calibrated data is essential in astrophysical applications, such as 21 cm cosmology, which rely on knowledge of the relative spectral sm…
View article: A Bayesian approach to high fidelity interferometric calibration I:\n mathematical formalism
A Bayesian approach to high fidelity interferometric calibration I:\n mathematical formalism Open
High fidelity radio interferometric data calibration that minimises spurious\nspectral structure in the calibrated data is essential in astrophysical\napplications, such as 21 cm cosmology, which rely on knowledge of the relative\nspectral…
View article: A Study of 90 GHz Dust Emissivity on Molecular Cloud and Filament Scales
A Study of 90 GHz Dust Emissivity on Molecular Cloud and Filament Scales Open
Recent observations from the MUSTANG2 instrument on the Green Bank Telescope have revealed evidence of enhanced long-wavelength emission in the dust spectral energy distribution (SED) in the Orion Molecular Cloud (OMC) 2/3 filament on 25″ …