High-Energy observations of Stellar-mass Compact Objects: from CVs to Ultraluminous X-Ray Sources

Progetto: Research project

Description

This project involves the majority of the Italian community working on stellar-mass compact objects,ranging from cataclysmic variables, to magnetars, pulsars, Galactic black-hole and neutron-starbinaries and Ultraluminous X-ray Sources in external galaxies. The project is based on a large amountof proprietary data from GO programs of all high-energy missions currently operative, plusinvolvement in additional international proposals and programs for exploitation of archival data. TheResearch Units of the project form a full network as there are numerous ongoing collaborations bothon observations and theory. The network has deep experience in data analysis at all wavelengths and intheir interpretation, as well as in the development of in-house software for the analysis of largedatabases and for periodic/aperiodic timing.

Layman's description

This project involves the majority of the Italian community working on stellar-mass compact objects,ranging from cataclysmic variables, to magnetars, pulsars, Galactic black-hole and neutron-starbinaries and Ultraluminous X-ray Sources in external galaxies. The main lines of research covered by this proposal are the following• Study of the properties of magnetars, and other isolated NS to understand the emissionmechanisms of their steady and bursting emission as well as the role of magnetic field evolutionin the context of different populations of NS, such as the enigmatic radio-quiet compact X-raysources at the centre of young SNR.• Study of NS and BH transient X-ray binaries over a large range of accretion rates, from brightoutburst phases to quiescent levels. The aims are a characterization of the properties of accretion indifferent regimes and their relation to the ejection of relativistic jets.• Study of the fast aperiodic variability of NS and BH binaries to test General Relativistic modelsand identify characteristic features related to the properties of the compact object.• Identification of new hard X-ray sources discovered with INTEGRAL and Swift, search for softX-ray counterparts and doing optical spectroscopy of candidate counterparts• Study of High Mass X-ray Binaries and Supergiant Fast X-ray Transients to understand the originof their outburst mechanism and the link with persistent sources, the low-luminosity persistent Besystems and the magnetic field of the NS accretor via the study of hard X-ray cyclotron spectralfeatures. Long-term variability of cyclotron resonant scattering features in accreting magnetizedneutron using INTEGRAL and Swift-BAT data • Study of the broad band spectra of Low Mass X-ray Binaries (LMXB) to explain the overallspectral evolution with a physical and self-consistent scenario; application of the Comptonizationmodel and comparison with other models; study of discrete features in the X-ray spectra ofLMXB, making use of the high-resolution instruments (Chandra, XMM-Newton) • Study of bursting NS binaries. Type-I bursts are powerful tracers of fundamental properties ofneutron stars, while the elusive type-II bursts can shed light on the properties of instabilities in theaccretion flow around a neutron star.• Study of the emission properties of ULXs in nearby galaxies. The fundamental goal is toinvestigate their spectral and variability properties in order to constrain accretion models anddetermine the mass of the black hole hosted in them.-We will analyse X-ray data to address these topics.

Key findings

Spazio
StatoAttivo
Data di inizio/fine effettiva3/1/188/31/19