A5028840631- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Relativity and Gravitational Theory
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Radioactive Decay and Measurement Techniques
- Statistical and numerical algorithms
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Astro and Planetary Science
- Advanced Differential Geometry Research
- Quantum Electrodynamics and Casimir Effect
Universidad de Oviedo
2012-2021
National Institute for Astrophysics
2014-2021
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2018-2021
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2021
Instituto de Física de Cantabria
2011-2017
Universidad de Cantabria
1993-2017
Consejo Superior de Investigaciones Científicas
1993-2017
Unidades Centrales Científico-Técnicas
2012-2017
Institute for Space Astrophysics and Planetology
2015-2016
Cavendish Hospital
2005
We present the Planck Sky Model (PSM), a parametric model for generation of all-sky, few arcminute resolution maps sky emission at submillimetre to centimetre wavelengths, in both intensity and polarisation. Several options are implemented cosmic microwave background, Galactic diffuse (synchrotron, free-free, thermal spinning dust, CO lines), H-II regions, extragalactic radio sources, dusty galaxies, kinetic Sunyaev-Zeldovich signals from clusters galaxies. Each component is simulated by...
We present detailed predictions of the contributions various source populations to counts at frequencies tens GHz. New evolutionary models are worked out for flat-spectrum radio quasars, BL Lac objects, and steep-spectrum sources. Source characterized by spectra peaking high frequencies, such as extreme GPS sources, ADAF/ADIOS sources early phases γ-ray burst afterglows also dealt with. The different star-forming galaxies (normal spirals, starbursts, high-z detected SCUBA MAMBO surveys,...
We present predictions for the counts of extragalactic sources, contributions to fluctuations and their angular power spectrum in each channel foreseen Planck Surveyor (formerly COBRAS/SAMBA) mission. The contribution owing clustering both radio far-IR sources is found be generally small comparison with Poisson term; however relative importance increases may eventually become dominant if are identified subtracted down faint flux limits. central frequency bands expected 'clean': at high...
We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard gamma-ray bands. Our unique set has allowed us demonstrate that selection method strongly influences results, producing biases cannot be ignored. Almost all BL Lac objects have been detected by Fermi-LAT, whereas ~40% of flat-spectrum radio quasars (FSRQs) radio, X-ray selected are still below detection limit even after integrating 27 months...
We propose a new detection technique in the plane based on an isotropic wavelet family. This family is naturally constructed as extension of Gaussian-Mexican Hat Wavelet pair and for that reason we call it Mexican Family (MHWF). show performance these wavelets when dealing with extragalactic point sources cosmic microwave background (CMB) maps: very important issue within most general problem component separation sky. Specifically, flat two-dimensional simulations sky comprising all...
We present models to predict high frequency counts of extragalactic radio sources using physically grounded recipes describe the complex spectral behaviour blazars, that dominate mm-wave at bright flux densities. show simple power-law spectra are ruled out by high-frequency (nu>100 GHz) data. These data also strongly constrain featuring breaks predicted classical physical for synchrotron emission produced in jets blazars (Blandford & Konigl 1979; 1981). A model dealing with as a single...
We combine Planck High Frequency Instrument data at 857, 545, 353 and 217 GHz with from Wide-field Infrared Survey Explorer (WISE), Spitzer, IRAS Herschel to investigate the properties of a well-defined, flux-limited sample local star-forming galaxies. A 545 flux density limit was chosen so that is 80 per cent complete this frequency, resulting contains total 234 local, dust emission star formation via various models calculate mass function. Although single-component-modified blackbodies fit...
view Abstract Citations (146) References (61) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discrete Source Contributions to Small-Scale Anisotropies of the Microwave Background Franceschini, A. ; Toffolatti, L. Danese, de Zotti, G. We have computed temperature fluctuations microwave background due unresolved, randomly distributed sources, for a wide interval angular scales (from few arcseconds several tens degrees) and wavelengths ranging from centimeters...
We implement an independent component analysis (ICA) algorithm to separate signals of different origin in sky maps at several frequencies. Owing its self-organizing capability, it works without prior assumptions on either the frequency dependence or angular power spectrum various signals; rather, learns directly from input data how identify statistically components, assumption that all but, most, one components have non-Gaussian distributions. applied ICA simulated patches four frequencies...
It is the aim of this paper to introduce use isotropic wavelets detect and determine flux point sources appearing in cosmic microwave background (CMB) maps. The most suitable wavelet filtered with a Gaussian beam 'Mexican Hat'. An analytical expression coefficient obtained presence source provided used detection estimation methods presented. For illustration method applied two simulations (assuming Planck mission characteristics) dominated by CMB (100 GHz) dust (857 GHz), as these will be...
We present a method to simulate the polarization properties of extragalactic radio sources at microwave frequencies. Polarization measurements nearly 2 × 106 1.4 GHz are provided by NVSS survey. Using this catalogue and GB6 survey, we study distribution degree both steep- flat-spectrum sources. find that is anticorrelated with flux density for former population, while no correlation detected latter. The available high-frequency data exploited determine frequency dependence degrees. such...
We have used the MHW2 filter to obtain estimates of flux densities at WMAP frequencies a complete sample 2491 sources, mostly brighter than 500 mJy 5 GHz, distributed over whole sky excluding strip around Galactic equator (|b| ≤ 5°). After having detected 933 sources ≥3 σ level in filtered maps—our New Extragalactic Point Source Catalogue (NEWPS3 σ)—we are left with 381 ≥5 least one channel, 369 which constitute our NEWPS5 catalog. It is remarkable note that 98 (i.e., 26%) "new," they not...
We present predictions on the angular power spectrum of CMB fluctuations due to extragalactic point sources (EPS) by using a method for simulating realistic 2D distributions clustered EPS. Both radio and far--IR selected source populations are taken into account. To analyze different clustering scenarios, we exploit spectra EPS, $P(k)$, estimated either data coming from currently available surveys or means theoretical predictions. By adopting number counts predicted Toffolatti et al. (1998)...
We present an estimation of the point source (PS) catalogue that could be extracted from forthcoming ESA Planck mission data. have applied Spherical Mexican Hat Wavelet (SMHW) to simulated all-sky maps include cosmic microwave background (CMB), Galactic emission (thermal dust, free–free and synchrotron), thermal Sunyaev–Zel'dovich effect PS emission, as well instrumental white noise. This work is extension one presented in Vielva et al. developed algorithm focused on a fast local optimal...
We study the detection of extragalactic point sources in two-dimensional flat simulations for all frequencies forthcoming ESA's Planck mission. In this work we have used most recent available templates microwave sky: as diffuse Galactic components and Sunyaev-Zel'dovich clusters ``Plank Reference Sky Model''; sources, our - which comprise source populations relevant frequency interval are based on up-to-date cosmological evolution models sources. To consistently compare capabilities...
The Planck Early Release Compact Source Catalogue (ERCSC) has offered the first opportunity to accurately determine luminosity function of dusty galaxies in very local Universe (i.e. distances ≲100 Mpc), at several (sub-)millimetre wavelengths, using blindly selected samples low-redshift sources, unaffected by cosmological evolution. This project, however, requires careful consideration a variety issues including choice appropriate flux density measurement, separation from radio sources and...
Recent polarimetric surveys of extragalactic radio sources (ERS) at frequencies<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo> </mml:mo><mml:mi>ν</mml:mi><mml:mo>≳</mml:mo><mml:mn>1</mml:mn></mml:math> GHz are reviewed. By exploiting all the most relevant data we study frequency dependence polarization properties ERS between 1.4 and 86 GHz. For flat-spectrum median (mean) fractional increases from 1.5% (2–2.5%) to 2.5–3% (3–3.5%) at<mml:math...
An estimation of the number and amplitude (in flux) extragalactic point sources that will be observed by Planck Mission is presented in this paper. The study based on Mexican Hat wavelet formalism introduced Cayón et al. Simulations at observing frequencies are analysed, taking into account all possible cosmological, Galactic emissions together with noise. With technique used work, produce a catalogue above following flux values: 1.03 Jy (857 GHz), 0.53 (545 0.28 (353 0.24 (217 0.32 (143...
view Abstract Citations (86) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interpretation of Deep Counts Radio Sources Danese, L. ; de Zotti, G. Franceschini, A. Toffolatti, A new determination the local radio luminosity function galaxies allows it to be concluded that unevolving low-luminosity sources cannot account for observed flattening normalized differential source counts below mJy levels. Nor can this feature produced by evolving...
We present a maximum-entropy method (MEM) and ‘Mexican hat’ wavelet (MHW) joint analysis to recover the different components of microwave sky from simulated observations by ESA Planck Surveyor satellite in small patch . This combined allows one improve CMB, Sunyaev–Zel'dovich Galactic foregrounds separation achieved MEM technique alone. In particular, reconstructed CMB map is free any bright point-source contamination. The also produces catalogues at each frequency that are more complete...
We present results on spectral index distributions, number counts, redshift distribution and other general statistical properties of extragalactic point sources in the New Extragalactic WMAP Point Source 5σ (NEWPS) sample.The flux calibrations at all Wilkinson Microwave Anisotropy Probe channels have been reassessed both by comparison with ground-based observations through estimates effective beam areas.The two methods yield consistent correction factors.A search NASA Data base (NED) has...
In this work we apply the stacking technique to estimate average fractional polarisation from 30 353 GHz of a primary sample 1560 compact sources - essentially all radio detected in Planck all-sky map and listed second version Catalogue Compact Sources (PCCS2). We divide our two subsamples according whether lay (679 sources) or not (881 inside sky region defined by Galactic mask (fsky ~ 60 per cent) area around Magellanic Clouds. find that is approximately constant (with frequency) both...
In the presence of strong clustering, low-resolution surveys measure summed contributions groups sources within beam. The counts bright intensity peaks are therefore shifted to higher flux levels compared individual detected with high-resolution instruments. If beam-width corresponds a sizable fraction clustering size, as in case Planck/HFI, one actually detects fluxes clumps sources. We argue that distribution clump luminosities can be modelled terms two- and three-point correlation...
We discuss the effects on CMB, CIB, and thermal SZ effect due to peculiar motion of an observer with respect CMB rest frame, which induces boosting effects. investigate scientific perspectives opened by future space missions, focussing CORE proposal. The improvements in sensitivity offered a mission like CORE, together its high resolution over wide frequency range, will provide more accurate estimate dipole. extension polarization cross-correlations enable robust determination purely...