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, September 20th, 2017
I will present my phenomenological model for AGN at z ~ 0 which is based on the Eddington ratio distribution function. My results show that black hole growth at z ~ 0 can be described by two Eddington ratio distribution functions: one for X-ray and one for radio AGN. The distributions vary in shape, however they are both mass independent. This implies that more massive galaxies are neither more likely to host AGN nor to host high accretion rate AGN. I will show how my results relate to quenching and discuss how this simple, but intuitive model can be used to study further characteristics of the AGN phenomenon. Besides AGN feedback, major galaxy mergers are often considered as a possible cause for quenching. To investigate the impact of major merger quenching I use the stellar mass functions of visually selected major merger and post merger galaxies. I will show that major mergers are unlikely to be a significant quenching pathway, neither at z ~ 0 nor within the last 5 Gyrs. Furthermore, I will discuss how major mergers affect the Eddington ratio distribution function.
Conference • 12:00 AM, October 9th - 12th, 2017
This NExScI meeting will gather experts in the field to understand community needs for follow-up ground-based high resolution imaging and spectroscopic observations in the era of K2 and TESS and leading into JWST, PLATO, and WFIRST. Register by Aug 18, 2017.
Science Talk • 12:15 PM, October 11th, 2017 • IPAC Morrisroe large conference room