Anderson Caproni
A5046162611- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Astro and Planetary Science
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Scientific Measurement and Uncertainty Evaluation
- Particle physics theoretical and experimental studies
- X-ray Spectroscopy and Fluorescence Analysis
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Mechanics and Biomechanics Studies
- Spectroscopy and Laser Applications
- Ionosphere and magnetosphere dynamics
Universidade Cidade de São Paulo
2019-2025
TU Dortmund University
2023
University of Łódź
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
University of Turku
2023
Niels Brock
2023
University of Copenhagen
2023
Main Astronomical Observatory
2023
Taras Shevchenko National University of Kyiv
2023
National Academy of Sciences of Ukraine
2023
The Cherenkov Telescope Array, CTA, will be the major global observatory for very high energy gamma-ray astronomy over next decade and beyond. scientific potential of CTA is extremely broad: from understanding role relativistic cosmic particles to search dark matter. an explorer extreme universe, probing environments immediate neighbourhood black holes voids on largest scales. Covering a huge range in photon 20 GeV 300 TeV, improve all aspects performance with respect current instruments....
We provide an updated assessment of the power Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at TeV scale, via associated gamma-ray signal from pair-annihilating particles in region around Galactic centre. find that CTA will open a new window discovery potential, significantly extending range robustly testable models given standard cuspy profile density distribution. Importantly, even cored profile, projected sensitivity be sufficient probe various...
BL Lacertae is the prototype of Lac class active galactic nuclei, exhibiting intensive activity on parsec (pc) scales, such as intense core variability and multiple ejections jet components. In particular, in previous works existence precession motions pc-scale has been suggested. this work we revisit issue, investigating temporal changes observed right ascension declination offsets knots terms our relativistic jet-precession model. The seven free parameters model were optimized via a...
Abstract The recent discovery of a roughly simultaneous periodic variability in the light curves BL Lac object PG 1553+113 at several electromagnetic bands represents first case such odd behavior reported literature. Motivated by this, we analyzed 15 GHz interferometric maps parsec-scale radio jet to verify presence possible counterpart this variability. We used Cross-entropy statistical technique obtain structural parameters Gaussian components present source. kinematically identified seven...
Abstract Approximately one hundred sources of very-high-energy (VHE) gamma rays are known in the Milky Way, detected with a combination targeted observations and surveys. A survey entire Galactic Plane energy range from few tens GeV to TeV has been proposed as Key Science Project for upcoming Cherenkov Telescope Array Observatory (CTAO). This article presents status studies towards Survey (GPS). We build make publicly available sky model that combines data recent gamma-ray emitters...
The Perseus galaxy cluster is known to present multiple and misaligned pairs of cavities seen in X-rays, as well twisted kiloparsec-scale jets at radio wavelengths; both morphologies suggest that the active galactic nucleus (AGN) jet subject precession. In this work, we performed three-dimensional hydrodynamical simulations interaction between a precessing AGN warm intracluster medium plasma, whose dynamics are coupled Navarro–Frenk–White dark matter gravitational potential. inflates become...
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical instrumental backgrounds. We provide an updated assessment of the sensitivity Cherenkov Telescope Array (CTA) to such signals, based on observations Galactic centre region as well selected dwarf spheroidal galaxies. find current limits and detection prospects masses above 300 GeV will significantly...
Abstract We investigate active galactic nucleus (AGN) feedback from an intermediate-mass black hole at the center of a dwarf spheroidal galaxy, by performing isolated galaxy simulations using modified version GADGET-3 code. consider Leo II (PGC 34176) in Local Group as our simulation reference model. Beginning with seeds ranging 10 3 −10 6 M ⊙ , focus on comparing stellar/SN-only AGN+stellar/SN over 13.7 Gyr evolution. Our results indicate that low-mass AGN influences star formation history...
Abstract A wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low-mass high-mass binaries containing compact objects, isolated neutron stars exhibiting extreme variability as magnetars well pulsar wind nebulae. Although most them can up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. In this paper, we explore feasibility detecting new transients with Telescope Array Observatory...
VLBI observations have shown that the parsec-jet of 3C 345 is formed by several components, ejected from core with superluminal velocities and travelling along bent trajectories on plane sky. We interpret differences in velocity position angle among different features at formation time as result parsec-scale precession relativistic jet calculate aperture cone, between cone axis line sight Lorentz factor associated bulk motion. assumed a period 10.1 yr, which one B-band light curve long-term...
We show that it is possible to explain the physical origin of jet precession in active galactic nuclei (AGNs) through misalignment between rotation axes accretion disk and Kerr black hole. apply this scenario quasars, Seyfert galaxies also Galactic Center hole Sgr A*, for which signatures either or have been found. The formalism adopted parameterized by ratio period mass can be used put constraints properties as well spin those systems.
The Bardeen-Petterson general relativistic effect has been suggested as the mechanism responsible for precession in some accretion disk systems. Here we examine separately four mechanisms (tidal, irradiative, magnetic, and Bardeen-Petterson) that can lead to warping precession. We use a sample of eight X-ray binaries active galactic nuclei (AGNs) present signatures and/or their disks explore viability different mechanisms. For SMC X-1 4U 1907+09, all provide periods compatible with those...
Strong evidence for the presence of a warped Keplerian accretion disc in NGC4258 (M 106) has been inferred from kinematics water masers detected at sub-parsec scales. Assuming power-law and using constraints on parameters derived observational data, we have analyzed relativistic Bardeen-Petterson effect driven by Kerr black hole as potential physical mechanism responsible warping. We found that radius is comparable to or smaller than inner maser (independent allowed value spin parameter)....
Optical variability of 3C 120 is discussed in the framework jet precession. Specifically, we assume that observed long-term periodic produced by emission from an underlying with a time-dependent boosting factor driven The differences apparent velocities different superluminal components milliarcsec can also be explained precession model as being related to changes viewing angle. evolution has been used determine parameters model, which reproduce helical structure seen at large scales. Among...
If we assume that nuclei of extragalactic radio sources contain binary black hole systems, the two holes can eject VLBI components, in which case families different trajectories will be observed. Another important consequence a system is core associated with one hole, and if component ejected by second expects to able detect offset origin not core. The ejection components perturbed precession accretion disk motion around center gravity system. We modeled taking into account pertubations...
As is usual in dwarf spheroidal galaxies, today the Local Group galaxy Ursa Minor depleted of its gas content. How this lost still a matter debate. To study history loss Minor, we conducted first three-dimensional hydrodynamical simulations object, assuming that was driven by galactic winds powered only type II supernovae (SNe II). The initial setup and supernova (SN) rates used our are mainly constrained inferred star formation observed velocity dispersion Minor. After 3 Gyr evolution,...
A fundamental question regarding the evolution of dwarf spheroidal galaxies is identification key physical mechanisms responsible for gas depletion. Here, we focus on study stellar feedback in isolated galaxies, by performing numerical simulations using a modified version SPH code GADGET-3. The Milky Way satellite Leo II (PGC 34176) Local Group was considered as our default model galaxy. parameter space models explored to match observational constraints II, such residual mass, total mass...
In this paper we present observations of η Carinae in the 1.3 mm and 7 radio continuum, during 2003.5 low excitation phase. The expected minimum light curves was confirmed at both wavelengths probably due to a decrease number UV photons available ionize gas surrounding binary system. At very well defined peak superimposed on declining flux density. It presented maximum amplitude 29 June 2003 lasted for about 10 days. We show that its origin can be free-free emission from shock formed by...
We perform simulations for future Cherenkov Telescope Array (CTA) observations of RX~J1713.7$-$3946, a young supernova remnant (SNR) and one the brightest sources ever discovered in very-high-energy (VHE) gamma rays. Special attention is paid to explore possible spatial (anti-)correlations rays with emission at other wavelengths, particular X-rays CO/H{\sc i} emission. present series simulated images RX J1713.7$-$3946 CTA based on set observationally motivated models gamma-ray In these...
Abstract In this work, we report a radio galaxy with precessing jets, double-peaked emission lines and the presence of two compact components projected separation ∼6 parsec in very long baseline interferometry (VLBI) observations. The emission-line peak separations could be suggesting supermassive binary black hole (BBH) 6.3 parsec, matching VLBI results. kinematic jet precession model applied to jets J1328+2752 indicates that if it is BBH, accretion disk primary not coplanar system orbit,...
VLBA high spatial resolution observations of the disk structure active galactic nucleus (AGN) NGC 1068 have recently revealed that kinematics and geometry this AGN is well characterized by an outer H2O maser emission having a compact milliarcsecond- (parsec-) scale structure, which encircling thin rotating inner surrounding ~107 M☉ mass, likely black hole. A curious feature in source occurrence misalignment between parts disk, with galaxy's radio jet being orthogonal to disk. We interpret...
Theoretical ΛCDM cosmological models predict a much larger number of low mass dark matter haloes than has been observed in the Local Group galaxies.One possible explanation is increased difficulty detecting these if most visible lost at early evolutionary phases through galactic winds.In this work we study current triggering winds dwarf spheroidal galaxies (dSph) from supernovae, and study, based on 3D hydrodynamic numerical simulations, correlation loss rates important physical parameters...
Evidence of jet precession in many galactic and extragalactic sources has been reported the literature. Much this evidence is based on studies kinematics knots, which depends correct identification components to determine their respective proper motions position angles plane sky. Identification problems related fitting procedures, as well observations poorly sampled time, may influence follow-up consequently might contribute a misinterpretation data. In order deal with these limitations, we...
Abstract We present results from a non-cosmological, three-dimensional hydrodynamical simulation of the gas in dwarf spheroidal galaxy Ursa Minor . Assuming an initial baryonic-to-dark-matter ratio derived cosmic microwave background radiation, we evolved galactic distribution over 3 Gyr, taking into account effects types Ia and II supernovae. For first time, used our instantaneous supernovae rates chemical evolution model applied to spectroscopic observational data show that amount is lost...