A5105928633- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Advanced X-ray and CT Imaging
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Orthopedic Surgery and Rehabilitation
- Nuclear physics research studies
Leibniz Association
2024
Purdue University Fort Wayne
2023
University of Miami
2007-2018
Goddard Space Flight Center
2016
Dublin Institute For Advanced Studies
2016
American Orchid Society
2013-2014
Osaka University
2014
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2011
Roma Tre University
2009-2011
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2006
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...
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 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,...
The amount of detected baryons in the local universe is at least a factor 2 smaller than that measured high redshift. It believed significant fraction current "hiding" hot filamentary structure filling intergalactic space, warm-hot medium (WHIM). We found evidence missing WHIM by detecting their signature on angular correlation diffuse X-ray emission with XMM-Newton satellite. Our result indicates 12% ± 5% total energy range 0.4–0.6 keV due to filaments. statistical significance our...
We assess the possibility to detect warm-hot intergalactic medium (WHIM) in emission and characterize its physical conditions spatial distribution through spatially resolved X-ray spectroscopy, framework of recently proposed DIOS, EDGE, Xenia, ORIGIN missions, all which are equipped with microcalorimeter-based detectors. For this purpose we analyze a large set mock spectra, extracted from cosmological hydrodynamical simulation. These spectra searched for features showing both OVII K alpha...
The number of detected baryons in the universe at z < 0.5 is much smaller than predicted by standard big bang nucleosynthesis and detailed observation Lyα forest redshift = 2. Hydrodynamic simulations indicate that a large fraction expected to be "warm-hot" (105-107 K) filamentary gas, distributed intergalactic medium. This if it exists, should observable only soft X-ray UV bands. Using predictions particular hydrodynamic model, we simulated flux as function energy 0.1-2 keV band due...
ABSTRACT DXL ( Diffuse X-ray emission from the Local Galaxy ) is a sounding rocket mission designed to estimate contribution of solar wind charge eXchange (SWCX) diffuse background and help determine properties Hot Bubble. The detectors are large area thin-window proportional counters with spectral response that similar PSPC used in ROSAT All Sky Survey (RASS). A direct comparison RASS data for same part sky viewed quite different vantage points system, assumption approximate isotropy wind,...
Hydrodynamic simulations predict that a significant fraction of the gas in current Universe is form high temperature, highly ionized plasma emitting and absorbing primarily soft X-ray UV bands, dubbed Warm-Hot Intergalactic Medium (WHIM). Its signature should be observable red-shifted emission absorption lines from elements. To determine expected WHIM band we used output large scale hydrodynamic SPH simulation to generate images spectra with angular resolution 14'' energy 1 eV. The biggest...
Recent analyses of the fluctuations soft diffuse X-ray background (DXB) have provided indirect detection a component consistent with elusive warm-hot intergalactic medium (WHIM). In this work we use theoretical predictions obtained from hydrodynamical simulations to investigate angular correlation properties WHIM in emission and assess possibility next-generation missions. Our results indicate that signal is generally weak but dominates function DXB outside virialized regions. Its possible...
We use numerical simulations to predict the soft X-ray ([0.4–0.6] keV) and Sunyaev–Zel'dovich (SZ) signal (at 150 GHz) from a large-scale structure in universe then compute two-point statistics study spatial distribution time evolution of signals. The average predicted for warm-hot intergalactic medium (WHIM) is good agreement with observational constraints that set it at about 10% total diffuse background. characteristic angle computed autocorrelation function order some arcminutes becomes...
ABSTRACT We analyzed data from a shadow observation of the high density molecular cloud MBM36 ( l ∼ 4°, b 35°) with Suzaku . is located in region that emits relatively weakly 3/4 keV band compared to surrounding North Polar Spur (NPS)/Loop 1 structure and Galactic Bulge (GB). The contrast between low targets area allows one separate local distant contributors soft diffuse X-ray background, providing much better characterization individual components single pointing observations. identify two...
Looking at the region connecting two clusters is a promising way to identify and study Warm–Hot Intergalactic Medium. Observations show that spectrum of bridge between A3556 A3558 has stronger soft X-ray emission than nearby region. Suzaku observations could not discriminate origin extra emission. In this work we analyze dedicated Chandra observation same target point sources characterize background in bridge. We find count number much higher average field population (using CDFS 4 Ms as...
The backbone of the large-scale structure Universe is determined by processes on a cosmological scale and gravitational interaction dominant dark matter. However, mobile baryon population shapes appearance these structures. Theory predicts that most baryons reside in vast unvirialized filamentary structures connect galaxy groups clusters, but observational evidence currently lacking. Because majority are supposed to exist large-scale, hot dilute gaseous phase, X-rays provide ideal tool...
Abstract We studied the spectral signature of different components diffuse X-ray background (DXB), including Local Hot Bubble, solar wind charge exchange, galactic halo, and typically unresolved point sources (galaxies active nuclei), in direction Chandra Deep Field South using 4 Ms XMM-Newton survey Source Catalog. In this paper, we present our results showing how contribute to DXB below 1 keV. particular, have found that ∼6% emission at <?CDATA $\tfrac{3}{4}$?> <mml:math...
We present a mission designed to address two main themes of the ESA Cosmic Vision Programme: Evolution Universe and its Violent phenomena. ESTREMO/WFXRT is based on innovative instrumental observational approaches, out mainstream observatories progressively increasing area, i.e.: Observing with fast reaction transient sources, like GRB, at their brightest levels, thus allowing high resolution spectroscopy. surveying through X-ray telescope wide field view sensitivity extended cluster Warm...
Shadow observations are the only way to observe emission from galactic halo (GH) and/or circumgalactic medium (CGM) free of any foreground contamination local hot bubble (LHB) and solar wind charge exchange (SWCX). We analyzed data a shadow observation in direction high latitude, neutral hydrogen cloud MBM 16 with \Suzaku. found that all can be accounted for by LHB SWCX, plus power law associated unresolved point sources. The GH/CGM is negligible or inexistent our observation, upper limits...
Looking at the region connecting two clusters is a promising way to identify and study Warm-Hot Intergalactic Medium. Observations show that spectrum of bridge between A3556 A3558 has stronger soft X-ray emission than nearby region. Suzaku observations could not discriminate origin extra emission. In this work we analyze dedicated Chandra observation same target point sources characterize background in bridge. We find count number much higher average field population (using CDFS~4~Ms as...
This white paper addresses selected new (to X-ray astronomy) physics and data analysis issues that will impact ASTRO-H SWG observations as a result of its high-spectral-resolution microcalorimeter, the focussing hard optics corresponding detectors, low background soft gamma-ray detector. We concentrate on atomic nuclear physics, including basic bound-bound bound-free transitions well scattering radiative transfer. The major topic categories include charge exchange, solar system sources,...