IPAC at Caltech partners with NASA, NSF, JPL and the world-wide research community to advance exploration of our Universe. Beginning with the IRAS mission in 1985 and spanning to Spitzer today, we have enabled transformative research of the infrared sky. We provide science operations, user support, data services, and scientific vision to maximize discovery with observatories both in space and on the ground. We share these discoveries with the public through education outreach programs and award-winning media. Our diverse community of active researchers is dedicated and essential to fulfilling this mission.
Science Talk • 12:15 PM, March 21st, 2018
The densest and the fluffiest galaxies // Nearly 100 years ago, Hubble formulated a classification system for galaxies that remains definitive, along with the addition of dwarf galaxies. However, since the start of the 21st century, several new varieties of stellar system have been recognized that do not fit in neatly with the standard taxonomy -- including in particular the ultracompact dwarfs (UCDs) and the ultra-diffuse galaxies (UDGs). I will present an overview of these enigmatic stellar systems, along with their interrelations, and new discoveries about their stellar populations and dark matter content.