M. Galeazzi
A5047798451- Superconducting and THz Device Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Particle Detector Development and Performance
- Solar and Space Plasma Dynamics
- Physics of Superconductivity and Magnetism
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Superconducting Materials and Applications
- Astronomical Observations and Instrumentation
- Thermal Radiation and Cooling Technologies
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Advanced Thermoelectric Materials and Devices
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Particle accelerators and beam dynamics
University of Miami
2014-2024
Trieste Astronomical Observatory
2024
University of Maryland, Baltimore County
2024
American Orchid Society
2009-2023
Goddard Space Flight Center
2003-2016
Dublin Institute For Advanced Studies
2016
RIKEN
2014
Japan Aerospace Exploration Agency
2010
Ehime University
2010
University of Wisconsin–Madison
1999-2009
This White Paper, submitted to the recent ESA call for science themes define its future large missions, advocates need a transformational leap in our understanding of two key questions astrophysics: 1) How does ordinary matter assemble into scale structures that we see today? 2) do black holes grow and shape Universe? Hot gas clusters, groups intergalactic medium dominates baryonic content local Universe. To understand astrophysical processes responsible formation assembly these structures,...
A high spectral resolution observation of the diffuse X-ray background in 60-1000 eV energy range has been made using an array 36 1 mm2 microcalorimeters flown on a sounding rocket. Detector ranged from 5 to 12 FWHM, and composite spectrum ~1 sr centered at l = 90°, b +60° was obtained with net ~9 eV. The target area includes bright keV regions but avoids Loop I North Polar Spur. Lines C VI, O VII, VIII are clearly detected intensities 5.4 ± 2.3, 4.8 0.8, 1.6 0.4 photons cm-2 s-1 sr-1,...
Most of the baryons from galaxies have been "missing" and several studies attempted to map circumgalactic medium (CGM) in their quest. We report on X-ray observations made with Chandra X-Ray Observatory probing warm-hot phase CGM our Milky Way at about 106 K. detect O vii viii absorption lines z = 0 extragalactic sight measure accurate column densities using both Kα Kβ vii. then combine these measurements emission Galactic halo literature derive density path length CGM. show that is massive,...
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe performing high-resolution, high-throughput spectroscopy with moderate angular resolution. covers very wide energy range from 0.3 keV to 600 keV. allows combination band (5-80 keV) provided multilayer coating, focusing hard mirrors imaging detectors, high energy-resolution soft (0.3-12...
Abstract High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of faint unidentified emission line reported in several low-resolution studies various massive systems, such as galaxies and clusters, including Perseus cluster. We have analyzed first-light observation The for based on XMM-Newton signal from large cluster sample under dark matter decay scenario is too be detectable data. However, previously 3.5 keV flux anomalously high compared sample-based...
The Hitomi SXS spectrum of the Perseus cluster, with $\sim$5 eV resolution in 2-9 keV band, offers an unprecedented benchmark atomic modeling and database for hot collisional plasmas. It reveals both successes challenges current codes. latest versions AtomDB/APEC (3.0.8), SPEX (3.03.00), CHIANTI (8.0) all provide reasonable fits to broad-band spectrum, are close agreement on best-fit temperature, emission measure, abundances a few elements such as Ni. For Fe abundance, APEC measurements...
Both heliophysics and planetary physics seek to understand the complex nature of solar wind's interaction with system obstacles like Earth's magnetosphere, ionospheres Venus Mars, comets. Studies this objective are frequently conducted help single or multipoint in situ electromagnetic field particle observations, guided by predictions both local global numerical simulations, placed context observations from far extreme ultraviolet (FUV, EUV), hard X-ray, energetic neutral atom imagers (ENA)....
Abstract The Lunar Environment heliospheric X-ray Imager (LEXI) is a wide field-of-view soft telescope developed to study solar wind-magnetosphere coupling. LEXI part of the Blue Ghost 1 mission comprised 10 payloads be deployed on lunar surface. monitors dayside magnetopause position and shape as function time by observing X-rays (0.1–2 keV) emitted from wind charge-exchange between exospheric neutrals high charge-state plasma in magnetosheath. Measurements are used test temporal models...
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe via suite four instruments, covering very wide energy range, from 0.3 keV to 600 keV. These instruments include high-resolution, high-throughput spectrometer sensitive over 0.3-2 with high spectral resolution Delta E < 7 eV, enabled micro-calorimeter array located focal plane thin-foil...
The Hitomi (ASTRO-H) mission is the sixth Japanese X-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. aimed to provide highest energy resolution ever achieved at E > 2 keV, using microcalorimeter instrument, cover wide range spanning four decades in from soft X-rays gamma-rays. After successful launch on 2016 February 17, spacecraft lost its function March 26, but commissioning phase for about month provided valuable...
Thanks to its high spectral resolution (~5 eV at 6 keV), the Soft X-ray Spectrometer (SXS) on board Hitomi enables us measure detailed structure of spatially resolved emission lines from highly ionized ions in galaxy clusters for first time. In this series papers, using SXS we have measured velocities gas motions, metallicities and multi-temperature core Perseus cluster. Here, show that when inferring physical properties line emissivities systems like Perseus, resonant scattering (RS) effect...
The present paper investigates the temperature structure of X-ray emitting plasma in core Perseus cluster using 1.8--20.0 keV data obtained with Soft Spectrometer (SXS) onboard Hitomi Observatory. A series four observations were carried out, a total effective exposure time 338 ks and covering central region $\sim7'$ diameter. SXS was operated an energy resolution $\sim$5 eV (full width at half maximum) 5.9 keV. Not only fine structures K-shell lines He-like ions but also transitions from...
ABSTRACT Diffuse X-rays from the Local Galaxy ( DXL ) is a sounding rocket mission designed to quantify and characterize contribution of Solar Wind Charge eXchange (SWCX) X-ray Background study properties Hot Bubble (LHB). Based on results mission, we quantified removed SWCX diffuse background measured by ROSAT All Sky Survey. The “cleaned” maps were used investigate physical LHB. Assuming thermal ionization equilibrium, highly uniform temperature distributed around kT = 0.097 keV ± 0.013...
The standard non-equilibrium theory of noise in ideal bolometers and microcalorimeters fails to predict the performance real devices due additional effects that become important at low temperature. In this paper we extend include most these effects, find operating 60 mK can be quantitatively predicted. We give a simple method for doing necessary calculations, borrowing block diagram formalism from electronic control theory.
We analyzed two XMM-Newton observations in the direction of high density, latitude, neutral hydrogen cloud MBM20 and a nearby low density region that we called Eridanus hole. The is at distance evaluated between 100 200 pc from Sun its sufficiently to shield about 75% foreground emission 3/4 keV energy band.The combination makes possible an evaluation OVII OVIII both for component due Local Bubble,and background one, primary galactic halo.The are good agreement with each other ROSAT same...
Three recent results related to the heliosphere and local interstellar medium (ISM) have provided an improved insight into distribution conditions of material in solar neighborhood. These are measurement magnetic field outside by Voyager 1, mapping three-dimensional structure neutral surrounding Local Cavity using extensive ISM absorption line reddening data, a sounding rocket flight which observed heliospheric helium focusing cone X-rays robust estimate contribution wind charge exchange...
We describe the development, launch into space, and initial results from a prototype wide field-of-view soft X-ray imager that employs lobster-eye optics targets heliophysics, planetary, astrophysics science. The sheath transport observer for redistribution of mass is first instrument using this type launched space provides proof-of-concept future flight instruments capable imaging structures such as terrestrial cusp, entire dayside magnetosheath outside magnetosphere, comets, Moon, solar...
Abstract We present the results from Hitomi Soft Gamma-ray Detector (SGD) observation of Crab nebula. The main part SGD is a Compton camera, which in addition to being spectrometer, capable measuring polarization gamma-ray photons. nebula one brightest X-ray/gamma-ray sources on sky, and only source polarized X-ray photons have been detected. observed during initial test phase Hitomi. performed data analysis observation, background estimation, Monte Carlo simulations, successfully detected...
We analyzed Suzaku and Chandra observations of the soft diffuse X-ray background toward four sightlines with goal characterizing emission from Milky Way circumgalactic medium (CGM). identified two thermal components CGM, one at a uniform temperature $\rm kT = 0.176\pm0.008 ~keV$ other temperatures ranging between 0.65-0.90~ keV$. The lower component is consistent Galaxy's virial ($ \sim10^{6}~ K$). hotter are similar to that recently discovered ($\rm \sim 10^{7}~ K$; Das et al.) in sightline...
We assess the possibility to detect and characterize physical state of missing baryons at low redshift by analyzing X-ray absorption spectra Gamma Ray Burst [GRB] afterglows, measured a micro calorimeters-based detector with 3 eV resolution 1000 cm2 effective area capable fast re-pointing, similar that on board recently proposed satellites EDGE XENIA. For this purpose we have analyzed mock extracted from different hydrodynamical simulations used model properties Warm Hot Intergalactic Medium...
The next generation X-ray observatory ASTRO-H will open up a new dimension in the study of galaxy clusters by achieving for first time spectral resolution required to measure velocities intracluster plasma, and extending at same coverage energies well beyond 10 keV. This white paper provides an overview capabilities exploring gas motions including their cosmological implications, physics AGN feedback, dynamics cluster mergers as associated high-energy processes, chemical enrichment medium,...