Welcome to two new postdocs who will work on AGN at PUC: Tim Hewlett and Giacomo Venturi!
An international team of researchers, including Ezequiel Treister (PUC), Claudio Ricci (UDP) and Lia Sartori (PUC/ETH), performed the largest survey of the cores of nearby galaxies in near-infrared light, using high-resolution images taken by NASA's Hubble Space Telescope and the W. M. Keck Observatory in Hawaii. The Hubble observations represent over 20 years' worth of snapshots from its vast archive. The team discovered that a large number of AGNs, especially those with high luminosities, are generated by collisions between galaxies.
The near-IR high-resolution observations used to perform this work permitted to look through the thick layers of gas and dust that cover these regions. The study, led by Michael Koss (Eureka Scientific Inc.), was published today on Nature.
Left: Images from the SDSS catalog of some of the galaxies of the sample, with the nuclei obscured by gas and dust. Right: Infrared images, obtained by the Keck Observatory, of the nuclei of these galaxies that show that they are merging.