Maandagavond 27 november 2017 organiseert de sterrenvereniging Astra Alteria de lezing “Galaxies and super-massive black holes”. De lezing wordt verzorgd door de heer Davide Lena; de voertaal is Engels. De lezing start om 20.00 uur en vindt plaats in Hotel Hof van Putten, Harderwijkerstraat 14, 3881 EH Putten. De lezing is gratis voor leden van Astra Alteria; niet leden betalen € 6,00.
During this meeting I will give a general introduction on the subject of “galaxies”, then I will focus on their nuclear regions, where super-massive black holes reside, and I will give a brief overview of my research work.
Stars are not scattered uniformly throughout the vastity of the Universe, rather they are found in large associations known as galaxies: celestial bodies composed of stars, gas, dust, rocks, planets. Galaxies are themselves an heterogeneous class of bodies, their sizes and masses varying over several orders of magnitudes. Some of them, as the ultra-compact galaxies, with radii of only a few parsecs, are so small that distinguishing them from mere star clusters is not trivial. Others, often residing at the center of galaxy clusters, are so large to include several thousands of billions of stars, extending up to one megaparsec (comparable with the distance separating Putten from the Andromeda galaxy). I will give an overview of these systems highlighting the stunning differences that show up in this class of astronomical objects.
In the second part of my talk I will zoom-in on galactic nuclei, where supermassive black holes reside. Their masses are larger than a million times the mass of the sun. Although they account for a tiny fraction of the galaxy mass, they can influence its evolution! I will discuss the evidence for the existence of these exotic objects. Finally I will give a brief overview of my work - which evolves around the interplay between galactic nuclei and super-massive black holes.
A brief version of my CV