A5101467312- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Superconducting and THz Device Technology
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Monetary Policy and Economic Impact
- Particle Detector Development and Performance
- Precipitation Measurement and Analysis
- Soil Moisture and Remote Sensing
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- Neutrino Physics Research
- Advanced Statistical Methods and Models
- Spatial and Panel Data Analysis
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
Universidad de Oviedo
2021-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2010-2013
A precision measurement by the Alpha Magnetic Spectrometer on International Space Station of positron fraction in primary cosmic rays energy range from 0.5 to 350 GeV based $6.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ and electron events is presented. The very accurate data show that steadily increasing 10 $\ensuremath{\sim}250\text{ }\text{ }\mathrm{GeV}$, but, 20 250 GeV, slope decreases an order magnitude. spectrum shows no fine structure, ratio observable anisotropy. Together, these...
Measurement of the chemical and isotopic composition cosmic rays is essential for precise understanding their propagation in galaxy. While model parameters are mainly determined using B/C ratio, study extended sets ratios can provide stronger constraints on models. In this paper, relative abundances light-nuclei lithium, beryllium, boron, carbon presented. The secondary-to-primary Li/C, Be/C, have been measured kinetic energy range 0.35–45 GeV nucleon−1. ratio 7Li/6Li also magnetic rigidity...
The variety of isotopes in cosmic rays allows us to study different aspects the processes that undergo between time they are produced and their arrival heliosphere. In this paper, we present measurements isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be), 10B/11B range 0.2–1.4 GeV kinetic energy per nucleon. based on data collected by Alpha Magnetic Spectrometer, AMS-01, during STS-91 flight 1998 June.
Aims. The main goal of this work is to test the results a methodological improvement in measurement magnification bias signal on sample submillimeter galaxies. In particular, we investigate constraining power cosmological parameters within ΛCDM model. We also discuss important points that can affect results. Methods. measured angular cross-correlation function between foreground GAMA II galaxies single wide spectroscopic redshift bin 0.2 < z 0.8 and background from Herschel -ATLAS....
Context. Gravitational lensing is a powerful tool for studying the distribution of mass in Universe. Understanding magnification bias effect gravitational and its impact on flux sub-millimetre galaxies (SMGs) crucial accurate interpretations observational data. Aims. This study aims to investigate context analyse density profiles different types foreground lenses, including quasi-stellar objects (QSOs), galaxies, galaxy clusters. The specific goals are compare lens types, assess angular...
Context. High-z submillimetre galaxies can be used as a background sample for gravitational lensing studies thanks to their magnification bias. In particular, the bias exploited in order constrain free parameters of halo occupation distribution (HOD) model and some main cosmological parameters. A pseudo-tomographic analysis shows that tomographic approach should improve parameter estimation. Aims. this work has been evaluated tool set-up. The cross-correlation function (CCF) data have...
Component separation is the process with which emission sources in astrophysical maps are generally extracted by taking multi-frequency information into account. It crucial to develop more reliable methods for component future CMB experiments. We aim a new method based on fully convolutional neural networks called Cosmic microwave background Extraction Neural Network (CENN) order extract signal total intensity. The frequencies used Planck channels 143, 217 and 353 GHz. validate network at...
Aims. The main goal of this paper is to derive observational constraints on the halo mass fuction (HMF) by performing a tomographic analysis magnification bias signal sample background submillimeter galaxies. results can then be compared with those from non-tomographic study. Methods. We measure cross-correlation function between foreground GAMA galaxies spectroscopic redshifts in range $0.1 < z 0.8$ (and divided up into four bins) and H-ATLAS photometric $1.2 4.0$. model weak lensing within...
Context. This work focuses on the submillimeter galaxy magnification bias, specifically in tomographic scenario. It builds upon previous works, while utilising updated data to refine methodology employed constraining free parameters of halo occupation distribution model and cosmological within a flat ΛCDM model. Aims. aims optimise CPU time explore strategies for analysing different redshift bins, maintaining measurement precision. Additionally, it seeks examine impact excluding GAMA15...
In this work, we want to exploit the magnification bias of SMGs using two different foreground samples, quasi-stellar objects (QSOs) and galaxies. Our aim is study compare their mass density profiles estimate masses concentrations. The background SMG sample consists observed by \textit{Herschel} with 1.2<z<4.0. samples are QSOs massive galaxies spectroscopic redshifts between 0.2 1.0. cross-correlation measurements estimated Davis-Peebles estimator stacking SMG-QSO SMG-galaxy pairs for...
In this work we want to study the average mass density profile of tens hundreds clusters galaxies acting as lenses that produce a magnification bias on SMGs, and estimate their associated masses concentrations for different richness ranges. The background sample is composed SMGs observed by Herschel with 1.2<z<4.0 (mean redshift at ~2.3) while foreground made up galaxy extracted from SDSS III photometric redshifts 0.05< z< 0.8 ~0.38). Measurements are obtained stacking SMG--cluster pairs...
Gravitational lensing is a powerful tool for studying the distribution of mass in Universe. Understanding magnification bias effect gravitational and its impact on flux sub-millimetre galaxies (SMGs) crucial accurate interpretations observational data. This study aims to investigate analyse density profiles different types foreground lenses, including quasi-stellar objects, galaxies, clusters. The specific goals are compare lens types, assess angular resolution analysis, determine adequacy...
Magnification bias, an observational effect of gravitational lensing in the weak regime, allows testing cosmological model through angular correlations sources at different redshifts. This has been observed various contexts, particularly with sub-millimeter galaxies (SMGs), offering astrophysical and insights. The study aims to investigate magnification bias exerted by galaxy clusters on SMGs its implications for parameters within $\Lambda$CDM model. was explored quantifying...
Context. Magnification bias, an observational effect of gravitational lensing in the weak regime, allows cosmological model to be tested through angular correlations sources at different redshifts. This has been observed various contexts, particularly with sub-millimetre galaxies (SMGs), offering valuable astrophysical and insights. Aims. The study aims investigate magnification bias exerted by galaxy clusters on SMGs its implications for parameters within Λ-CDM model. Methods. was explored...
The measurement of the cross-correlation function is crucial to assess magnification bias in galaxy surveys. Previous works used mini-tile subsampling, but accurately determining integral constraint (IC) correction for unbiased estimation challenging due various factors. We present a new methodology estimating function, utilizing full field area and reducing statistical uncertainty. Covariance matrices were estimated by dividing each into at least five patches using k-mean clustering...
The main goal of this work, the second in a three-paper series, is to test impact methodological improvement measuring magnification bias signal on sample submillimeter galaxies and its implications for constraining cosmological parameters. analysis considers angular cross-correlation function between foreground GAMA ($0.2<z<0.8$) background H-ATLAS ($1.2<z<4.0$). A refined methodology, discussed extensively Paper I, used. By interpreting weak lensing within halo model employing an MCMC...
Context. Point source (PS) detection is an important issue for future cosmic microwave background (CMB) experiments since they are one of the main contaminants to recovery CMB signal on small scales. Improving its multi-frequency would allow us take into account valuable information otherwise neglected when extracting PS using a channel-by-channel approach. Aims. We aim develop artificial intelligence method based fully convolutional neural networks detect in realistic simulations and...
Component separation is the process with which emission sources in astrophysical maps are generally extracted by taking multi-frequency information into account. It crucial to develop more reliable methods for component future CMB experiments. We aim a new method based on fully convolutional neural networks called Cosmic microwave background Extraction Neural Network (CENN) order extract signal total intensity. The frequencies used Planck channels 143, 217 and 353 GHz. validate network at...
Constraining the polarisation properties of extragalactic point sources is a relevant task not only because they are one main contaminants for primordial cosmic microwave background B-mode detection if tensor-to-scalar ratio lower than r = 0.001, but also better understanding radio-loud active galactic nuclei. We develop and train machine learning model based on convolutional neural network to learn how estimate flux density angle embedded in images knowing their positions. To network, we...
This paper is the third in a series on submillimeter galaxy magnification bias, focusing tomographic scenario. It refines methodology used to constrain halo occupation distribution model and cosmological parameters within flat $Λ$CDM model, using updated data. The study aims optimize CPU time, explore strategies for analyzing different redshift bins, assess impact of excluding GAMA15 field. approach involves dividing range into bins cross-correlation measurements between foreground galaxies....
Recovering the polarized cosmic microwave background (CMB) is crucial for shading light on Cosmic Inflation. Methods with different characteristics should be developed and optimized. We aim to use a neural network called CENN train it recovering E B modes of CMB. realistic simulations 256x256 pixel squared patches at 100, 143 217 GHz Planck channels, which contain CMB, thermal dust, synchrotron, PS noise. make several trainings sets: 30, 25 20 arcmin resolution same position in sky. After...
Constraining the polarisation properties of extragalactic point sources is a relevant task not only because they are one main contaminants for primordial cosmic microwave background B-mode detection if tensor-to-scalar ratio lower than r = 0.001, but also better understanding radio-loud active galactic nuclei. We develop and train machine learning model based on convolutional neural network to learn how estimate flux density angle embedded in images knowing their positions. To network, we...