A5052181123- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Satellite Communication Systems
- Spacecraft Design and Technology
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Precipitation Measurement and Analysis
- Wheat and Barley Genetics and Pathology
- Agriculture and Biological Studies
- Relativity and Gravitational Theory
- Neutrino Physics Research
- Advanced Frequency and Time Standards
Imperial College London
2023-2025
Instituto de Astrofísica de Canarias
2019-2024
Universidad de La Laguna
2019-2024
Kyoto University
2024
Tohoku University
2024
Utah State University
2020-2023
IAC (United States)
2023
South African Radio Astronomy Observatory
2022
Rhodes University
2022
University of Manchester
2010-2021
ABSTRACT We present QUIJOTE intensity and polarization maps in four frequency bands centred around 11, 13, 17, 19 GHz, covering approximately 29 000 deg2, including most of the northern sky region. These result from 9000 h observations taken between May 2013 June 2018 with first multifrequency instrument (MFI), have angular resolutions 1°, sensitivities within range 35–40 µK per 1° beam, being a factor ∼2–4 worse intensity. discuss data processing pipeline employed, basic characteristics...
Large surveys using the Sunyaev–Zel'dovich (SZ) effect to find clusters of galaxies are now starting yield large numbers systems out high redshift, many which new discoveries. In order provide theoretical interpretation for release full SZ cluster samples over next few years, we have exploited large-volume Millennium gas cosmological N-body hydrodynamics simulations study population at low and three models with varying physics. We confirm previous results smaller that intrinsic (spherical)...
Abstract We use the Planck Early Release Compact Source Catalogue combined with Wilkinson Microwave Anisotropy Probe (WMAP) and other archival measurements to construct continuum spectra of three nearby dusty star-forming galaxies: Messier 82, NGC 253 4945. carry out a least-squares fit using combination simple synchrotron, free–free thermal dust models, look for evidence anomalous microwave emission (AME). find that radio all galaxies are consistent steep spectrum synchrotron emission,...
The C-Band All-Sky Survey (C-BASS) is an all-sky full-polarisation survey at a frequency of 5 GHz, designed to provide complementary data the surveys WMAP and Planck, future CMB B-mode polarization imaging surveys. observing has been chosen signal that dominated by Galactic synchrotron emission, but suffers little from Faraday rotation, so measured directions good template for higher observations, carry direct information about magnetic field. Telescopes in both northern southern hemispheres...
Context. Observations of the redshifted 21-cm line neutral hydrogen (H I ) are a new and powerful window observation that offers us possibility to map spatial distribution cosmic H learn about cosmology. Baryon Acoustic Oscillations from Integrated Neutral Gas (BINGO) is unique radio telescope designed be one first probe baryon acoustic oscillations (BAO) at frequencies. Aims. BINGO has two science goals: cosmology astrophysics. Cosmology main goal driver for BINGO’s design strategy. The key...
Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy1. Current orbiting constellation have brightnesses between apparent magnitudes 4 and 6, whereas the near-infrared Ks band, they can reach magnitude 2 (ref. 2). Satellite operators, astronomers other users night sky are working on brightness mitigation strategies3,4. Radio emissions induce further potential risk radio telescopes that also need be evaluated. Here we...
Ultralight axionlike particles (ALPs) can be a viable solution to the dark matter problem. The scalar field associated with ALPs, coupled electromagnetic acts as an active birefringent medium, altering polarization properties of light through which it propagates. In particular, oscillations axionic induce monochromatic variations plane linearly polarized radiation astrophysical signals. radio emission millisecond pulsars provides excellent tool search for such manifestations, given their...
This work focuses on the study of anomalous microwave emission (AME), an important mechanism between 10 and 60,GHz whose polarisation properties are not yet fully understood is therefore a potential contaminant for future cosmic background (CMB) observations. We used new QUIJOTE-MFI maps at 11, 13, 17, 19,GHz obtained from combination public wide survey data additional 1800,h dedicated raster scan observations together with other ancillary data, including WMAP Planck to AME in three Galactic...
Abstract Galactic synchrotron emission exhibits large angular scale features known as radio spurs and loops. Determining the physical size of these structures is important for understanding local interstellar structure modeling magnetic field. However, distance to either under debate or entirely unknown. We revisit a classical method finding location by comparing optical polarization angles with those function distance. consider three tracers field: stellar polarization, polarized emission,...
Anomalous Microwave Emission (AME) has been previously studied in two well-known molecular clouds and is thought to be due electric dipole radiation from small spinning dust grains. It important measure the polarization properties of this both for component separation future cosmic microwave background experiments also constrain models. We have searched linearly polarized radio emission associated with $\rho$ Ophiuchi Perseus using {\it WMAP} 7-year data. found no significant within an...
21cm intensity mapping is a novel approach aimed at measuring the power spectrum of density fluctuations and deducing cosmological information, notably from Baryonic Acoustic Oscillations (BAO). We give an update on progress BAO Integrated Neutral Gas Observations (BINGO) which single dish project. First we explain basic ideas behind concept before updating instrument design for BINGO. also outline survey plan to make its projected science output including estimates parameters.
Context. Observing the neutral hydrogen distribution across Universe via redshifted 21 cm line intensity mapping constitutes a powerful probe for cosmology. However, signal is obscured by foreground emission from our Galaxy and other extragalactic foregrounds. This paper addresses capabilities of BINGO survey to separate such signals. Aims. We show that instrumental, optical, simulations setup suitable component separation, we have appropriate tools understand control residuals....
Abstract The polarization of photons emitted by astrophysical sources might be altered as they travel through a dark matter medium composed ultra light axion-like particles (ALPs). In particular, the coherent oscillations ALP background in galactic halo induce periodic change on electromagnetic radiation local such pulsars. Building up previous works, we develop new, more robust, analysis based generalised Lomb-Scargle periodogram to search for this signal emission Crab supernova remnant...
ABSTRACT We derive linearly polarized astrophysical component maps in the Northern Sky from QUIJOTE-MFI data at 11 and 13 GHz combination with Wilkinson Microwave Anisotropy Probe K Ka bands (23 33 GHz) all Planck channels (30–353 GHz), using parametric separation method B-SeCRET. The addition of significantly improves parameter estimation low-frequency foregrounds, especially synchrotron spectral index, βs. present first detailed βs map Celestial Hemisphere a smoothing scale 2°. find...
We have studied the implications of high sensitivity polarization measurements objects from WMAP point source catalogue made using VLA at 8.4, 22 and 43 GHz. The fractional sources is almost independent frequency with a median ~2 per cent an average, for detected sources, ~3.5 cent. These values are also total intensity over narrow range we sample. Using contemporaneous sample 105 all 3 frequencies, investigated spectral behaviour as function by means 2-colour diagram. Most power-law spectra...
We present an analysis of the diffuse emission at 5 GHz in first quadrant Galactic plane using two months preliminary intensity data taken with C-Band All Sky Survey (C-BASS) northern instrument Owens Valley Radio Observatory, California. Combining C-BASS maps ancillary to make temperature-temperature plots we find synchrotron spectral indices $\beta = -2.65 \pm 0.05$ between 0.408 and $ \beta -2.72 0.09$ 1.420 for $-10^{\circ} < |b| -4^{\circ}$, $20^{\circ} l 40^{\circ}$. Through...
Anomalous Microwave Emission (AME) is a significant component of Galactic diffuse emission in the frequency range $10$-$60\,$GHz and new window into properties sub-nanometre-sized grains interstellar medium. We investigate morphology AME $\approx10^{\circ}$ diameter $\lambda$ Orionis ring by combining intensity data from QUIJOTE experiment at $11$, $13$, $17$ $19\,$GHz C-Band All Sky Survey (C-BASS) $4.76\,$GHz, together with 19 ancillary datasets between $1.42$ $3000\,$GHz. Maps physical...
The measurement of diffuse 21-cm radiation from the hyperfine transition neutral hydrogen (HI signal) in different redshifts is an important tool for modern cosmology. However, detecting this faint signal with non-cryogenic receivers single-dish telescopes a challenging task. BINGO (Baryon Acoustic Oscillations Integrated Neutral Gas Observations) radio telescope instrument designed to detect baryonic acoustic oscillations (BAOs) cosmological HI signal, redshift interval $0.127 \le z 0.449$....
The BINGO telescope was designed to measure the fluctuations of 21-cm radiation arising from hyperfine transition neutral hydrogen and aims Baryon Acoustic Oscillations (BAO) such fluctuations, therefore serving as a pathfinder future deeper intensity mapping surveys. requirements for Phase 1 projects consider large reflector system (two 40 m-class dishes in crossed-Dragone configuration), illuminating focal plane with 28 horns sky two circular polarisations drift scan mode produce...
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The C-Band All-Sky Survey (C-BASS) has observed the Galaxy at 4.76GHz with an angular resolution of $0.73^\circ$ full-width half-maximum, and detected Galactic synchrotron emission high signal-to-noise ratio over entire northern sky ($\delta > -15^{\circ}$). We present results a spatial correlation analysis foregrounds mid-to-high ($b 10^\circ$) latitudes using preliminary version C-BASS intensity map. jointly fit for synchrotron, dust, free-free components between $20$ $1000$GHz look...
The large-scale distribution of neutral hydrogen (HI) in the Universe is luminous through its 21 cm emission. goal Baryon Acoustic Oscillations from Integrated Neutral Gas Observations -- BINGO radio telescope to detect baryon acoustic oscillations (BAOs) at frequencies intensity mapping (IM). will span redshift range 0.127 $< z <$ 0.449 with an instantaneous field-of-view $14.75^{\circ} \times 6.0^{\circ}$. In this work we investigate different constructive and operational scenarios...