A5092897262- High-pressure geophysics and materials
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Engineering and Material Science Research
- Galaxies: Formation, Evolution, Phenomena
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
Brera Astronomical Observatory
2024
University of Insubria
2023
Sgr A* is currently very faint. However, X-ray radiation reflected by the A complex, a group of nearby molecular clouds, suggests that it went through one or more periods high activity some hundreds years ago. We aim to determine whether previously proposed physical scenarios are consistent with observed variability over past 25 years, and characterize spatial distribution, shape, internal structure clouds. exploit full set XMM-Newton observations, extending studied dataset on at least 12...
Context . Sgr A ⋆ , the supermassive black hole at center of Milky Way, is currently very faint. However, X-ray radiation reflected by complex, a group nearby molecular clouds, suggests that it went through one or more periods high activity some hundreds years ago. Aims We aim to determine whether previously proposed physical scenarios are consistent with observed variability over past 25 years. Furthermore, we seek characterize spatial distribution, shape, and internal structure clouds....
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ($<10"$ FWHM) and broad spectral coverage (0.2-80 keV) with an effective area far superior to current facilities' (including XMM-Newton NuSTAR). These capabilities enable revolutionary new insights into variety of important astrophysical problems. We present scientific objectives simulations observations the Galactic Center (GC) Bulge. demonstrate unique powerful observatory for studying both point...
Large-scale magnetic fields are observed off the midplanes of disk galaxies, indicating that they harbour magnetised halos. These halos crucial to studies galaxy evolution, galactic-scale outflows, and feedback from star formation activity. Identifying halo Milky Way is challenging because potential contamination foreground emission arising in local spiral arms. Additionally, it unclear how our influenced by recently revealed large-scale structures such as X-ray emitting eROSITA Bubbles,...
Context. Sgr A ⋆ is the electromagnetic counterpart of accreting supermassive black hole in Galactic center. Its emission variable near-infrared (NIR) and X-ray wavelengths on short timescales (several minutes to a few hours). The NIR light curve displays red-noise variability, while exhibits bright flares that rise by many orders magnitude upon stable quiescent emission. Every flare associated with flux change, but opposite not always true. physical origin still under debate. Aims. We...
(Abridged) Sgr A$^\star$ is the electromagnetic counterpart of accreting supermassive black hole in Galactic center. Its emission variable near-infrared (NIR) and X-ray wavelengths on short timescales. The physical origin NIR flares still under debate. We introduce a model for production from an active region A$^\star$, where particle acceleration takes place intermittently. In contrast to other radiation models flares, not assumed be instantaneous. studied evolution distribution emitted...
Context. Molecular clouds in the Galactic center (GC) reprocess radiation from past outbursts of nearby high-energy sources, generating a bright Fe K α fluorescence at 6.4 keV. The closest to GC are only ≃1.5 pc Sgr A ⋆ , forming torus-like structure known as circumnuclear disk (CND). study emission can lead characterization illuminating source(s), reflecting clouds, and global geometry such system lying GC. Aims. primary purpose our is analyze possible signals arising CND. This signal would...
Molecular clouds in the Galactic center (GC) reprocess radiation from past outbursts of nearby high-energy sources, generating a bright Fe K-alpha fluorescence at 6.4 keV. The closest to GC are only $\simeq 1.5$ pc Sgr A*, forming torus-like structure known as circumnuclear disk (CND). study emission can lead characterization illuminating source(s), reflecting clouds, and global geometry such system lying GC. primary purpose our is analyze possible signals arising CND. This signal would...