A5048309868- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Ionosphere and magnetosphere dynamics
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Atmospheric Ozone and Climate
- Neutrino Physics Research
- Astronomy and Astrophysical Research
- Geomagnetism and Paleomagnetism Studies
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Dust and Plasma Wave Phenomena
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Vehicle emissions and performance
- Molecular Spectroscopy and Structure
- Wind and Air Flow Studies
- Particle physics theoretical and experimental studies
Durham University
2023
Universidade de São Paulo
2014-2023
TU Dortmund University
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
Within ten nearby (d < 450 pc) Gould belt molecular clouds we evaluate statistically the relative orientation between magnetic field projected on plane of sky, inferred from polarized thermal emission Galactic dust observed by Planck at 353 GHz, and gas column density structures, quantified gradient density, NH. The selected regions, covering several degrees in size, are analysed an effective angular resolution 10′ FWHM, thus sampling physical scales 0.4 to 40 pc nearest cloud. densities...
Polarimetry is extensively used as a tool to trace the interstellar magnetic field projected on plane of sky. Moreover, it also possible estimate intensity from polarimetric maps based Chandrasekhar-Fermi method. In this work, we present results for turbulent, isothermal, three-dimensional simulations sub/supersonic and sub/super-Alfvénic cases. With cubes, assuming perfect grain alignment, created synthetic different orientations mean with respect line sight (LOS). We show that dispersion...
We present a number of statistical tools for obtaining studying turbulence in molecular clouds and diffuse interstellar medium. For our tests we used three-dimensional 512 cube compressible MHD isothermal simulations performed different sonic Alfvenic Mach numbers. introduce the bispectrum, new tool studies medium which, unlike an ordinary power spectrum turbulence, preserves phase information stochastic field. show that bispectra 3D density field column densities, available from...
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...
The amplification and maintenance of the observed magnetic fields in ICM are usually attributed to turbulent dynamo action. This is generally derived employing a collisional MHD model. However, ion mean free path between collisions order dynamical scales, thus requiring collisionless description. Unlike simulations, our study uses an anisotropic plasma pressure with respect direction local field, which brings within parameter space where instabilities should take place. Within adopted model...
Turbulence is ubiquitous in the insterstellar medium and plays a major role several processes such as formation of dense structures stars, stability molecular clouds, amplification magnetic fields, re-acceleration diffusion cosmic rays. Despite its importance, interstellar turbulence, alike turbulence general, far from being fully understood. In this review we present basics physics, focusing on statistics structure energy cascade. We explore physics compressible incompressible turbulent...
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...
Over the last few years it became clear that turbulent magnetic reconnection and magnetized turbulence are inseparable. It was not only shown is responsible for violating frozen-in condition in turbulence, but also stochastic 3D generates by itself. The actual mechanism this driving still unknown. Processes such tearing mode or Kelvin-Helmholtz, among other plasma instabilities, could generate from irregular current sheets. We address nature of process consider a relative role...
Abstract Magnetic reconnection is a process that changes magnetic field topology in highly conducting fluids. Within the standard Sweet–Parker model, this would be too slow to explain observations (e.g., solar flares). In reality, must ubiquitous as astrophysical fluids are magnetized and motions of fluid elements necessarily entail crossing frozen-in lines reconnection. presence turbulence, independent microscopic plasma properties may much faster than previously thought, proposed Lazarian...
ABSTRACT A deep survey of the Large Magellanic Cloud at ∼0.1–100 TeV photon energies with Cherenkov Telescope Array is planned. We assess detection prospects based on a model for emission galaxy, comprising four known emitters, mock populations sources, and interstellar galactic scales. also detectability 30 Doradus SN 1987A, constraints that can be derived nature dark matter. The will allow fine spectral studies N 157B, 132D, LMC P3, C, half dozen other sources should revealed, mainly...
In this work, considering the impact of a supernova remnant (SNR) with neutral magnetized cloud we derived analytically set conditions that are favourable for driving gravitational instability in and thus star formation. Using these conditions, have built diagrams SNR radius, RSNR, versus initial density, nc, constrain domain parameter space where formation is allowed. This work an extension to previous study performed without magnetic fields (Melioli et al. 2006, hereafter Paper I). The...
NGC 1275, the central galaxy in Perseus cluster, is host of gigantic hot bipolar bubbles inflated by active galactic nucleus (AGN) jets observed radio as A. It presents a spectacular Hα-emitting nebulosity surrounding with loops and filaments gas extending to over 50 kpc. The origin still unknown, but probably correlates mechanism responsible for giant buoyant bubbles. We present 2.5 three-dimensional magnetohydrodynamical (MHD) simulations region cluster which turbulent energy, possibly...
Continuing our series of papers on the three-dimensional (3D) structure and accurate distances planetary nebulae (PNe), we present here results obtained for PN NGC 40. Using data from different sources wavelengths, construct 3D photoionization models derive physical quantities ionizing source nebular gas. The procedure, discussed in detail previous papers, consists use codes constrained by observational to structure, chemical characteristics, star parameters objects simultaneously fitting...
In the past few decades detailed observations of radio and X-ray emission from massive binary systems revealed a whole new physics present in such systems. Both thermal non-thermal components this indicate that most radiation at these bands originates shocks. O B-type stars Wolf–Rayet (WR) supersonic winds that, when colliding, emit largely due to free–free radiation. The emissions are synchrotron inverse Compton processes, respectively. case, magnetic fields expected play an important role...
Turbulence is ubiquitous in the interstellar medium (ISM) of Milky Way and other spiral galaxies. The energy source for this turbulence has been much debated with many possible origins proposed. universality turbulence, its reported large-scale driving, that it occurs also starless molecular clouds, challenges models invoking any stellar source. A more general process needed to explain observations. In work, we study role galactic arms. This accomplished by means three-dimensional...
We simulate the spectral behaviour of non-transient gamma-ray binaries using archival observations as a reference. With this we test CTA capability to measure sources' parameters and detect variability on various time scales. review known properties theoretical models that have been used describe their timing characteristics. show is capable studying these sources scales comparable characteristic For most binaries, unprecedented sensitivity will allow evolution be studied scale short 30 min....
The exact nature of eta Carinae is still an open issue. In this paper we assume a binary system to explain the strong X-ray emission, but also take into account that, near periastron and because highly eccentric orbit, wind emerging from accumulates behind shock can mimic shell-like ejection event. For process be effective, at secondary star should located between observer, solving discrepancy orbital parameters derived ground space based observations. We show as moves in its shell cools...
Theoretical and observational studies on the turbulence of interstellar medium developed fast in past decades. The theory supersonic magnetized turbulence, as well understanding projection effects observed quantities, are still progress. In this work we explore characterization turbulent cascade its damping from spectral line profiles. We address difference ion neutral velocities by clarifying nature partially ionized. provide theoretical arguments favor explanation larger Doppler broadening...
In recent years, we have experienced increasing interest in the understanding of physical properties collisionless plasmas, mostly because large number astrophysical environments (e.g. intracluster medium (ICM)) containing magnetic fields that are strong enough to be coupled with ionized gas and characterized by densities sufficiently low prevent pressure isotropization respect line direction. Under these conditions, a new class kinetic instabilities arises, such as firehose mirror...
We present an extensive analysis of the 850 μm polarization maps SCUBA Polarimeter Legacy (SCUPOL) Catalogue produced by Matthews et al., focusing exclusively on molecular clouds and star-forming regions. For sufficiently sampled regions, we characterize depolarization properties turbulent-to-mean magnetic field ratio each region. Similar sets parameters are calculated from two-dimensional synthetic dust-emission with three-dimensional magnetohydrodynamics (MHD) numerical simulations scaled...
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,...