A5106498107- 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
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Radioactive Decay and Measurement Techniques
- Relativity and Gravitational Theory
- Advanced Thermodynamic Systems and Engines
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Spacecraft and Cryogenic Technologies
- Statistical and numerical algorithms
- Spacecraft Design and Technology
National Institute for Astrophysics
2014-2024
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2024
Osservatorio Astronomico di Padova
2004-2022
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2009-2021
Osservatorio astronomico di Bologna
2021
Centre National de la Recherche Scientifique
2018-2020
National Astronomical Observatory of Japan
2020
Cardiff University
2020
High Energy Accelerator Research Organization
2020
École Normale Supérieure - PSL
2020
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
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...
The scientific performance of the Planck Low Frequency Instrument (LFI) after one year in-orbit operation is presented. We describe main optical parameters and discuss photometric calibration, white noise sensitivity, properties. A preliminary evaluation impact systematic effects For each parameters, we outline methods used to obtain them from flight data provide a comparison with pre-launch ground assessments, which are essentially confirmed in flight.
We present a system-level description of the Low Frequency Instrument (LFI) considered as differencing polarimeter, and evaluate its expected performance. The LFI is one two instruments on board ESA <i>Planck<i/> mission to study cosmic microwave background. It consists set 22 radiometers sensitive linear polarisation, arranged in orthogonally-oriented pairs connected 11 feed horns operating at 30, 44 70 GHz. In our analysis, generic Jones Mueller-matrix formulations for polarimetry are...
<i>Planck<i/> is a scientific satellite that represents the next milestone in space-based research related to cosmic microwave background, and many other astrophysical fields. was launched on 14 May of 2009 now operational. The uncertainty optical response its detectors key factor allowing achieve objectives. More than decade analysis measurements have gone into achieving required performances. In this paper, we describe main aspects optics are relevant science, estimated in-flight...
We describe the processing of data from Low Frequency Instrument (LFI) used in production Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss steps involved reducing telemetry packets to cleaned, calibrated, time-ordered (TOD) and frequency maps. Data are continuously calibrated using modulation temperature cosmic microwave background radiation induced by motion spacecraft. Noise properties estimated TOD which sky signal has been removed a generalized least...
The LSPE is a balloon-borne mission aimed at measuring the polarization of Cosmic Microwave Background (CMB) large angular scales, and in particular to constrain curl component CMB (B-modes) produced by tensor perturbations generated during cosmic inflation, very early universe. Its primary target improve limit on ratio scalar amplitudes down r = 0.03, 99.7% confidence. A second produce wide maps foreground our Galaxy synchrotron emission interstellar dust emission. These will be important...
We give the calibration and scientific performance parameters of Planck Low Frequency Instrument (LFI) measured during ground cryogenic test campaign. These characterise instrument response constitute our best pre-launch knowledge LFI performance. The shows excellent $1/f$ stability rejection instrumental systematic effects; noise that is most sensitive its kind. set will be updated flight operations through end mission.
Pelaksanaan program Perilaku Hidup Bersih dan Sehat (PHBS) di RA Al-Kautsar, Tangerang Selatan, yang dilaksanakan oleh mahasiswa Kuliah Kerja Nyata (KKN) Kelompok Synergi 29. Tujuan utama dari ini adalah untuk meningkatkan kesadaran pemahaman siswasiswi serta masyarakat mengenai pentingnya menjaga kesehatan kebersihan lingkungan. Melalui berbagai kegiatan, termasuk penyediaan fasilitas pendukung seperti wastafel portabel tempat sampah, pelaksanaan seminar orang tua guru, bertujuan...
The LFI radiometers use a pseudo-correlation design where the signal from sky is continuously compared with stable reference signal, provided by cryogenic load system. unit composed small pyramidal horns, one for each radiometer, 22 in total, facing absorbing targets, made of commercial resin ECCOSORB CR (TM), cooled to approximately 4.5 K. Horns and targets are separated gap allow thermal decoupling. Target horn optimized bands, centered at 70, 44 30 GHz. Pyramidal horns either machined...
The Planck satellite will observe the full sky at nine frequencies from 30 to 857 GHz. Temperature and polarization frequency maps made these observations are prime deliverables of mission. goal this paper is examine effects four realistic instrument systematics in GHz maps: non-axially-symmetric beams, sample integration, sorption cooler noise, pointing errors. We simulated one-year long detectors. timestreams contained cosmic microwave background (CMB) signal, foreground components (both...
The Low Frequency Instrument (LFI) is an array of pseudo-correlation radiometers on board the Planck satellite, ESA mission dedicated to precision measurements Cosmic Microwave Background. LFI covers three bands centred at 30, 44 and 70 GHz, with a goal bandwidth 20% central frequency. characterization broadband frequency response each radiometer necessary understand correct for systematic effects, particularly those related foreground residuals polarization measurements. In this paper we...
We describe the optical design and optimisation of Low Frequency Instrument (LFI), one two instruments onboard <i>Planck<i/> satellite, which will survey cosmic microwave background with unprecedented accuracy. The LFI covers 30–70 GHz frequency range an array cryogenic radiometers. Stringent requirements on angular resolution, sidelobes, main beam symmetry, polarization purity, feed orientation have been achieved. process was carried out by assuming ideal telescope according to using both...
We discuss the design and expected performance of STRIP (STRatospheric Italian Polarimeter), an array coherent receivers designed to fly on board LSPE (Large Scale Polarization Explorer) balloon experiment. The focal plane comprises 49 elements in Q band 7 W-band using cryogenic HEMT low noise amplifiers high waveguide components. In operation, will be cooled 20 K placed a $\sim 0.6$ meter telescope providing angular resolution $\sim1.5$ degrees. experiment aims at large scale, sensitivity...
[Abridged] The measurement of the polarization Cosmic Microwave Background radiation is one current frontiers in cosmology. In particular, detection primordial B-modes, could reveal presence gravitational waves early Universe. such component at moment most promising technique to probe inflationary theory describing very evolution We present updated performance forecast Large Scale Polarization Explorer (LSPE), a program dedicated CMB polarization. LSPE composed two instruments: Strip,...
The Planck Low Frequency Instrument (LFI) radiometers have been tested extensively during several dedicated campaigns. present paper reports the principal noise properties of LFI radiometers.
In this paper we discuss the linearity response of Planck-LFI receivers, with particular reference to signal compression measured on 30 and 44 GHz channels. article various sources present a model that accurately describes data during tests performed individual radiomeric chains. After discussing test results best parameter set representing receiver impact non in-flight calibration, which is shown be negligible.
The LSPE is a balloon-borne mission aimed at measuring the polarization of Cosmic Microwave Background (CMB) large angular scales, and in particular to constrain curl component CMB (B-modes) produced by tensor perturbations generated during cosmic inflation, very early universe. Its primary target improve limit on ratio scalar amplitudes down r = 0.03, 99.7% confidence. A second produce wide maps foreground our Galaxy synchrotron emission interstellar dust emission. These will be important...
70 GHz radiometer front-end and back-end modules for the Low Frequency Instrument of European Space Agency's Planck Mission were built tested. The operating principles design details mechanical structures are described along with key InP MMIC low noise amplifiers phase switches units. units tested in specially designed cryogenic vacuum chambers capable producing conditions required radiometers, specifically, a physical temperature 20 K modules, 300 4 reference signal sources. Test results...
ALMA has been operating since 2011, but not yet populated with the full suite of intended frequency bands. In particular, Band 2 (67-90 GHz) is final band in original definition to be approved for production. We aim produce a wideband, tuneable, sideband-separating receiver 28 GHz instantaneous bandwidth per polarisation sky range 67-116 GHz. Our design anticipates new requirements following recommendations 2030 Development Roadmap. The cryogenic cartridge designed compatible slot, where...
"This paper is part of the Prelaunch status LFI papers published on JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/jinst" This describes Planck Low Frequency Instrument tuning activities performed through ground test campaigns, from Unit to Satellite Levels. Tuning key achieve best possible instrument performance and parameters strongly depend thermal electrical conditions. For this reason has been repeated several times during tests it in flight before starting nominal operations....
The Stoner model predicts that a two-component Fermi gas at increasing repulsive interactions undergoes ferromagnetic transition. Using the random-phase approximation we study dynamical properties of interacting gas. For an atomic under harmonic confinement show transverse (spin-flip) susceptibility displays clear signature phase in magnon peak emerging from particle-hole continuum. spin susceptibilities could be experimentally explored via spin-dependent Bragg spectroscopy.