A5058299635- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Particle physics theoretical and experimental studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Relativity and Gravitational Theory
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Remote Sensing in Agriculture
- Ionosphere and magnetosphere dynamics
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2016-2025
University of Salento
2016-2025
Institute of Astronomy and Space Physics
2021-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2021-2023
Universidad Nacional de La Plata
2021-2023
University of Buenos Aires
2021-2023
Instituto de Tecnologías en Detección y Astropartículas
2021-2023
National University of General San Martín
2021-2023
National Technological University
2021-2023
Pierre Auger Observatory
2021-2023
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
Euclid will be the first space mission to survey most of extragalactic sky in 0.95-2.02 $\mu$m range, a 5$\sigma$ point-source median depth 24.4 AB mag. This unique photometric data set find wide use beyond Euclid's core science. In this paper, we present accurate computations Y_E, J_E and H_E passbands used by Near-Infrared Spectrometer Photometer (NISP), associated system. We pay particular attention passband variations field view, accounting among others for spatially variable filter...
Recently, Zakharov et al. (2005a, New Astron., 10, 479) considered the possibility of evaluating spin parameter and inclination angle for Kerr black holes in nearby galactic centers by using future advanced astrometrical instruments. A similar approach which uses characteristic properties gravitational retro-lensing images can be followed to measure charge a Reissner-Nordström hole. Indeed, spite fact that their formation might problematic, charged are objects intensive investigations. From...
Recently, gravitational microlensing has been investigated in the framework of weak field limit fourth order gravity theory. However, solar system data (i.e. planetary periods and light bending) can be used to put strong constraints on parameters this class theories. We find that these must very close those corresponding Newtonian
We investigate the ability of Euclid telescope to detect galaxy-scale gravitational lenses. To do so, we perform a systematic visual inspection $0.7\,\rm{deg}^2$ ERO data towards Perseus cluster using both high-resolution VIS $I_{\scriptscriptstyle\rm E}$ band, and lower resolution NISP bands. inspect every extended source brighter than magnitude $23$ in with $41$ expert human classifiers. This amounts $12\,086$ stamps $10^{\prime\prime}\,\times\,10^{\prime\prime}$. find $3$ grade A $13$ B...
The Dark Energy Camera (DECam) is a wide-field instrument mounted on the 4m V. Blanco Telescope (CTIO). Its impressive technical characteristics makes it one of most suitable ground-based telescope for production accurate stellar photometry even towards crowded regions such as Magellanic Clouds. We analysed DECam images acquired from February 2018 to January 2020 Small Cloud. performed PSF by using SExtractor and PSFEx tools producing comprehensive photometric catalogue in SDSS system,...
The existence of dark matter (DM) at scales a few parsecs down to $\ensuremath{\simeq}{10}^{\ensuremath{-}5}\text{ }\text{ }\mathrm{pc}$ around the centers galaxies and, in particular, Galactic Center region has been considered literature. Under assumption that such DM clump, principally constituted by nonbaryonic (like weakly interacting massive particles) does exist center our galaxy, study $\ensuremath{\gamma}$-ray emission from allows us constrain both mass and size this sphere. Further...
On 2011 August 11, INTEGRAL discovered the hard X-ray source IGR J17361-4441 near centre of globular cluster NGC 6388. Follow up observations with Chandra showed position transient was inconsistent dynamical centre, and thus not related to its possible intermediate mass black hole. The a peculiar spectrum (Gamma \approx 0.8) no evidence QPOs, pulsations, type-I bursts, or radio emission. Based on peak luminosity, classified as very faint transient, most likely low-mass binary. We re-analysed...
Several stars orbit around a black hole candidate of mass $3.7\times 10^6$ M$_{\odot}$, in the region Galactic Center (GC). Looking for General Relativistic (GR) periastron shifts is limited by existence stellar cluster that would modify orbits due to classical effects might mask GR effect. Only if one knows parameters (its and core radius) it possible unequivocally deduce expected then test them. In this paper shown observation proper motion Sgr A$^*$, $v_{Sgr A^*} = (0.4\pm 0.9)$ km...
We study the possibility to detect extrasolar planets in M31 through pixel-lensing observations. Using a Monte Carlo approach, we select physical parameters of binary lens system, star hosting planet, and calculate light curve taking into account finite source effects. Indeed, their inclusion is crucial since sources microlensing events are mainly giant stars. Light curves with detectable planetary features selected by looking for significant deviations from corresponding Paczy\'{n}ski...
As the Kepler mission has done for hot exoplanets, ESA Euclid and NASA Roman missions have potential to create a breakthrough in our understanding of demographics cool including unbound, or "free-floating", planets (FFPs). In this study, we demonstrate complementarity two propose joint-surveys better constrain mass distance microlensing events. We first that an early brief survey (7 h) fields will allow measurement large fraction events relative proper motions lens magnitudes. Then, study...
The emission of gravitational waves from a system massive objects interacting on hyperbolic orbits is studied in the quadrupole approximation. Analytic expressions are derived for radiation luminosity, total energy output and amplitude. An estimation expected number events towards different targets (i.e. globular clusters center Galaxy) also given. In particular, dense stellar cluster at galactic center, rate up to one event per year obtained.
Context. This paper reports on an XMM-Newton observation of the Seyfert 1 Galaxy Mrk 335 performed as a target opportunity when source was in unusually low flux state.
We present an updated analysis of the M31 pixel lensing candidate event OAB-N2 previously reported by Calchi Novati et al. Here we take advantage new data both astrometrical and photometrical. For astrometry: using archival 4 m KPNO Hubble Space Telescope/WFPC2 perform a detailed source whose result, although not fully conclusive on magnitude determination, is confirmed following light curve photometry analysis. photometry: first, unpublished WeCAPP allow us to confirm OAB-N2, only as viable...
We present a deep (~5.8 days) 0.3-2 keV high-resolution spectrum of NGC1365, collected with the reflection grating spectrometer (RGS) on board XMM-Newton. The is dominated by strong recombination lines He- and H-like transitions from carbon to silicon, as well L FeXVII. continuum strong, especially in 10 20 Angstrom, range. Formal fits require two optically thin, collisionally ionised plasma components, temperatures ~300 ~640 eV. However, they leave bulk forbidden components He-alpha OVII...
In the next future, astrometric microlensing will offer a new channel for investigating nature of both lenses and sources involved in gravitational event. The effect, corresponding to shift position multiple image centroid with respect source star location, is expected occur on scales from micro-arcoseconds milli-arcoseconds depending characteristics lens-source system. Here, we consider different classes events (single/binary lens acting single/binary source) also accounting additional...
In recent years free-loating planets (FFPs) have drawn a great interest among astrophysicists. Gravitational microlensing is unique and exclusive method for their investigation which may allow obtaining precious information about mass spatial distribution. The planned Euclid space-based observatory will be able to detect substantial number of events caused by FFPs towards the Galactic bulge. Making use synthetic population algorithm, we investigate possibility detecting finite source effects...
We consider the effects induced by presence of hot and cold spots on source star in light curves simulated microlensing events due to either single or binary lenses taking into account rotation orbital motion lens system. Our goal is study anomalies these curves.
This paper is a follow-up of previous about the M 82 galaxy and its halo based on Planck observations. As in case 82, substantial north-south east-west temperature asymmetry also found for 81 galaxy, extending up to galactocentric distances 1.5°. The almost frequency independent can be interpreted as Doppler-induced effect related rotation and/or triggered by gravitational interaction galaxies within Group. Along with analogous study several nearby edge-on spiral galaxies, cosmic microwave...
The transient event labelled as TCP J05074264+2447555 recently discovered towards the Taurus region was quickly recognized to be an ongoing microlensing on a source located at distance of only 700–800 pc from Earth. Here, we show that observations with high sampling rate close time maximum magnification revealed features imply presence binary lens system very low-mass ratio components. We present complete description system, which host Earth-like planet most likely mass 9.2 ± 6.6 M⊕....
We report a measurement of the energy spectrum cosmic rays above $2.5{\times} 10^{18}$ eV based on $215,030$ events. New results are presented: at about $1.3{\times} 10^{19}$ eV, spectral index changes from $2.51 \pm 0.03 \textrm{ (stat.)} 0.05 (sys.)}$ to $3.05 (stat.)}\pm 0.10\textrm{ (sys.)}$, evolving $5.1\pm0.3\textrm{ 0.1\textrm{ beyond $5{\times} while no significant dependence features declination is seen in accessible range. These can be reproduced models with energy-dependent mass...