Research Topics

photo AGN

Active Galactic Nuclei

Active Galactic Nuclei (AGNs) are the manifestation of accretion of material onto the supermassive black-holes (from several millions to several billions times the mass of the Sun) found in the centers of galaxies. The result of this accretion is the production of intense radiation over the whole electromagnetic spectrum and often the ejection…

image for Extrasolar Planetary Systems

Extrasolar Planetary Systems

Several thousand planetary systems around other stars have been discovered and characterized around pre-main-sequence and main-sequence stars, encompassing many sub-disciplines such as planet formation, circumstellar disks, dynamics, atmospheric chemistry, demographics, astrobiology, and even the search for techosignatures.  Our focus is on…

NGC 5257 AND NGC 5258

Galaxies

Galaxies are the places where stars form and live their lives. They exhibit a wide variety of morphologies and colours which in general terms reflect their past history. Hence studies of galaxies provide information on the formation of stars over the history of the Universe and the growth of the super-massive black holes residing in their…

cluster

Large-scale structure and Cosmology

The properties of the largest structure in the Universe (galaxy clusters and superclusters) respond to the contents of the Universe - dark matter and dark energy. For this reason, the properties of these largest structures on the largets possible non-expanding scale (the so-called turnaround scale, which is the boundary between a structure and…

polarimetry

Polarimetry

The Institute of  Astrophysics hosts a world-class center for polarimetric studies of point sources in the optical, featuring cutting-edge, innovative instruments, international collaborations with world-leading groups in Instrumentation, Observations, and Theory, and a wide variety of applications, including studies of extragalactic jets, the…

Orion

Star Formation

The process of the formation of stars, the building blocks of galaxies, from rarified gas lies at the foundation of modern astrophysics. Star formation is a complex physical process, which has operated over most of cosmic time and is not yet fully understood. While the study of star formation is a fundamental and exciting topic on its own, the…

Medusa SN remnant / IC443

Supernova remnants

Massive stars end their lives with spectacular explosions (supernovae). These explosions enrich the interstellar material with the heavy elements produced in the stars during their lifetime. In addition the strong shock waves of the explosion heat the surrounding interstellar medium to temperatures ranging from ~103 to 107 degrees. Therefore,…

shower

Ultra-high-energy cosmic rays

Ultra-high-energy cosmic rays are the highest-energy, rarest charged particles in the Universe. They pack the energy of an aggressively served tennis ball in a single subatomic particle. Their flux at the highest energies is as low as one particle per square kilometer per century! Their sources and their composition remain among the greatest…

HMXRB

X-ray-Binaries

X-ray binaries are stellar systems consisting of a star and a stellar remnant such as black-hole, neutron star or a white dwarf. When material from the star (or donor) is falling onto the stellar remnant (or compact object) it is heated to temperatures of several million degrees and produces copious X-ray emission. In this process we may also…