A5056024859- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Astro and Planetary Science
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Spectroscopy and Chemometric Analyses
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Astronomical and nuclear sciences
- Radiation Detection and Scintillator Technologies
Astronomical Observatory of Rome
2016-2025
National Institute for Astrophysics
2016-2025
Universidad Autónoma de Madrid
2022-2023
Consejo Superior de Investigaciones Científicas
2022
Istituto di Astrofisica Spaziale e Fisica cosmica di Palermo
2022
Brera Astronomical Observatory
2004-2022
Authorised Association Consortium
2015-2021
Agenzia Spaziale Italiana
2019
Universidade de São Paulo
2019
National Institute of Optics
2018
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
Gamma-ray burst (GRB) emission is believed to originate in highly relativistic fireballs. Currently, only lower limits were securely set the initial fireball Lorentz factor Gamma_0. We aim provide a direct measure of The early-time afterglow light curve carries information about Gamma_0, which determines time peak. have obtained early observations near-infrared afterglows GRB 060418 and 060607A with REM robotic telescope. For both events, peak could be clearly singled out, allowing firm...
Models and observations suggest that both the power effects of AGN feedback should be maximised in hyper-luminous (LBol > 1047 erg s-1) quasars, i.e. objects at brightest end luminosity function. In this paper, we present first results a multiwavelength observing programme, focusing on sample WISE/SDSS selected (WISSH) broad-line quasars z ≈ 1.5–5. The WISSH project has been designed to reveal most energetic AGN-driven outflows, estimate their occurrence peak quasar activity, extend study...
The 'Magnificent Seven' (M7) are a group of radio-quiet isolated neutron stars discovered in the soft X-rays through their purely thermal surface emission. Owing to large inferred magnetic fields (B ≈ 1013 G), radiation from these sources is expected be substantially polarized, independently mechanism actually responsible for A observed polarization degree (PD) is, however, only if quantum-electrodynamic (QED) effects present magnetized vacuum around star. detection strong linearly polarized...
We have undertaken a multi-band observing program aimed at obtaining complete census of winds in sample WISE/SDSS selected hyper-luminous (WISSH) QSOs z~2-4. analyzed the rest-frame optical (LBT/LUCI and VLT/SINFONI) UV (SDSS) spectra 18 randomly WISSH to measure SMBH mass study properties both NLR BLR traced by blueshifted/skewed [OIII] CIV emission lines, respectively. These are powered with masses $\ge$10$^9$ Msun accreting 0.4<$\lambda_{Edd}$<3.1. found existence two sub-populations...
The reionization of the Universe is one most important topics present day astrophysical research. plausible candidates for process are star-forming galaxies, which according to predictions majority theoretical and semi-analytical models should dominate HI ionizing background at z~3. We aim measuring Lyman continuum escape fraction, key parameters compute contribution galaxies UV background. have used ultra-deep U-band imaging (U=30.2mag 1sigma) by LBC/LBT in CANDELS/GOODS-North field, as...
Multi-messenger astronomy received a great boost following the discovery of kilonova AT2017gfo, optical counterpart gravitational wave source GW170817 associated with short gamma-ray burst GRB 170817A. AT2017gfo was first that could be extensively monitored in time both photometrically and spectroscopically. Previously, only few candidates have been observed against glare afterglows. In this work, we aim to search fingerprints AT2017gfo-like emissions optical/NIR light curves 39 GRBs known...
The ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Project led by the Italian National Institute for Astrophysics (INAF) is developing and will deploy at Observatorio del Teide mini-array (ASTRI Mini-Array) composed of nine telescopes similar to small-size dual-mirror Schwarzschild-Couder telescope (ASTRI-Horn) currently operating on slopes Mt. Etna in Sicily. Mini-Array surpass current Cherenkov array differential sensitivity above few tera-electronvolt (TeV), extending...
The ASTRI Mini-Array (MA) is an INAF project to build and operate a facility study astronomical sources emitting at very high-energy in the TeV spectral band. MA consists of group nine innovative Imaging Atmospheric Cherenkov telescopes. telescopes will be installed Teide Astronomical Observatory Instituto de Astrofisica Canarias (IAC) Tenerife (Canary Islands, Spain) on basis host agreement with INAF. Thanks its expected overall performance, better than those current telescopes' arrays for...
Abstract Black hole (BH) X-ray binaries (XRBs) are ideal targets to study the connection between accretion inflow and jet outflow. Here we present quasi-simultaneous, multiwavelength observations of Galactic BH system MAXI J1820+070, throughout its 2018–2019 outburst. Our data set includes coverage from radio through bands 17 different instruments/telescopes, encompasses 19 epochs over a 7 month period, resulting in one most well-sampled sets XRB outburst date. With our data, compile model...
Aims. With an observed and rest-frame duration of < 2s 0.5s, respectively, GRB090426 could be classified as a short GRB. The prompt detection, both from space ground-based telescopes, bright optical counterpart to this GRB offered unique opportunity complete detailed study. Methods. Based on extensive observational campaign, we obtained the spectrum afterglow GRB090426, measuring its redshift obtaining information about medium in which event took place. We completed follow-up observation...
Sources at the brightest end of QSO luminosity function during peak epoch star formation and black hole accretion (z~2-4, i.e. Cosmic noon) are privileged sites to study feeding & feedback cycle massive galaxies. We perform first systematic cold gas properties in most luminous QSOs, by characterising their host-galaxies environment. analyse ALMA, NOEMA JVLA observations FIR continuum, CO [CII] emission lines eight QSOs ($L_{\rm Bol}>3\times10^{47}$ erg/s) from WISSH sample z~2.4-4.7. report...
The existence of luminous quasars (QSOs) at the epoch reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳10 9 M ⊙ challenges models early SMBH formation and growth. To shed light on nature these sources, we started a multiwavelength program based sample 18 HYPerluminous Epoch ReionizatION (HYPERION). These are QSOs whose SMBHs must have had most rapid mass growth during first gigayear Universe therefore acquired largest their respective...
We performed a detailed spectroscopic analysis of three extremely metal-poor RR Lyrae stars, exploring uncharted territories at these low metallicities for this class stars. Using high-resolution spectra acquired with HARPS-N TNG, UVES VLT, and PEPSI LBT, employing Non-Local Thermodynamic Equilibrium (NLTE) spectral synthesis calculations, we provide abundance measurements Fe, Al, Mg, Ca, Ti, Mn, Sr. Our findings indicate that the stars have [Fe/H] = -3.40 \pm 0.05, -3.28 0.02, -2.77 0.05 HD...
CSL-1 (Capodimonte--Sternberg--Lens Candidate, No.1) is an extragalactic double source detected in the OAC-DF (Osservatorio Astronomico di Capodimonte - Deep Field). It can be interpreted either as chance alignment of two identical galaxies at z=0.46 or first case gravitational lensing by a cosmic string. Extensive modeling shows fact that strings are only type lens which (at least low angular resolution) produce undistorted images background source. We propose experimentum crucis to...
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during late stages its afterglow. The light curve shows a rebrightening occurring ~25 days after GRB. analysis VLT spectrum bump (27 GRB) reveals suggestive resemblance with prototypical type-Ic SN 1994I, about ~10 past maximum light. Particularly we have measured strong, broad absorption feature at 3770 A, which identified Ca II blueshifted by ~14400 km/s, thus indicating that supernova (SN)...
We present optical and near-infrared observations of the afterglow gamma-ray burst GRB 050904. derive a photometric redshift z = 6.3, estimated from presence Lyman break falling between I J filters. This is by far most distant known to date. Its isotropic-equivalent energy 3.4x10^53 erg in rest-frame 110-1100 keV band. Despite high redshift, both prompt emission are not peculiar with respect other GRBs. find J-band light curve at t_b 2.6 +- 1.0 d (observer frame). If we assume this jet...
Aims. We present the characteristics and some early scientific results of first instrument at Large Binocular Telescope (LBT), Camera (LBC). Each LBT telescope unit will be equipped with similar prime focus cameras. The blue channel is optimized for imaging in bands red VRIz bands. corrected field-of-view each camera approximately 30 arcmin diameter, chip area equivalent to a 2323 arcmin2 field. In this paper we also commissioning channel.
We present deep, wide-field g and r photometry of the transition type dwarf galaxy Leo T, obtained with blue arm Large Binocular Telescope. The data confirm presence both very young (<1 Gyr) as well much older (>5 stars. study structural properties old stellar populations by preferentially selecting either population based on their color magnitude. is significantly more concentrated than population, half-light radii 104+-8 148+-16 pc respectively, centers are slightly offset....