Research directions / Objectives

The research activities of the team are focused in the directions of Observational as well as Theoretical Astrophysics.

  1.      Observational Astrophysics

The observational efforts of the group are based on data obtained with Skinakas Observatory, Space observatories (e.g. Chandra, XMM-Newton, Hubble Space Telescope, Spitzer Space Telescope, Herschel Space Telescope), and other major ground-based telescopes.  The members of the team lead research programs in the following areas:

  •          X-ray emission from black holes  (characterization of variability and spectra as indicators of black-hole mass and physical processes in accreting material).
  •          Multi-wavelength emission from accreting X-ray pulsars  (connection between gas reservoir and accretion, interaction of pulsar magnetosphere and the accretion flow).
  •          X-ray emission from Anomalous X-ray pulsars (interpretation of their X-ray spectra in the context of accretion from a fall-back disk).
  •          Accreting binary populations in nearby galaxies (connection of accreting binaries and star-formation activity; the nature of Ultra-luminous X-ray sources; parameters influencing accreting binary formation and evolution).
  •          Mid-infrared properties of Luminous and Ultraluminous Infrared Galaxies (LIRGs/ULIRGs) (the nature of activity in the most luminous galaxies in the Universe).
  •          Star formation and stellar populations in Hickson Compact Groups.
  •          Multi-wavelength studies of interacting galaxies (the evolution of star-formation and nuclear activity along the merger sequence).
  •          Extragalactic large-scale jets (study of the polarization and the magnetic field structure in large scale jets emanating from accreting supermassive black holes).
  •          Interstellar magnetic fields (measurment of the interstellar magnetic field in our Galaxy by measuring the polarization of background sources).
  •          Detection of exoplanets (intensive monitoring with Skinakas of exoplanet candidates for the identification of exoplanets and measurements of their parameters).
  •      Theoretical Astrophysics

The theoretical efforts of the group are focused in the following areas:

  •          X-ray emission from accreting black-holes (modeling the physical processes in the accretion flow, and the resulting energy and Fourier spectra).
  •          Anomalous X-ray pulsars (modeling of the accretion flow onto X-ray pulsars; interpretation of observational results in the context of the fall-back disk model).
  •          Jets from accretion flows (emission mechanisms in astrophysical jets; spectrum, variability, and polarization of resulting emission).
  •          Dark matter (constraints on the nature of dark matter particles by modeling their high-energy signatures).
  •          Physical processes in star-formation.
  •          Modeling the Spectral Energy Distribution of Galaxies (deriving the physical connection between the interstellar medium and star formation in galaxies).
  •          Astrostatistics (Application of statistical methods in astrophysical problems).