Institute of Astronomy

A fundamental relation between the metallicity, gas content, and stellar mass of local galaxies

SpeakerTalk DateTalk Series
Matt Bothwell (Cavendish/KICC)5 February 2014Institute of Astronomy Seminars


Recent results have suggested that the well known mass-metallicity relation has a strong dependence on the star formation rate, to the extent that a three dimensional fundamental metallicity relation exists which links the three parameters with minimal scatter. In this talk, I describe work using a large sample of local galaxies observed in atomic hydrogen from the ALFALFA survey to demonstrate, for the first time, that a similar fundamental relation (the HI-FMR) also exists between stellar mass, gas-phase metallicity, and HI mass. This latter relation is likely more fundamental, driving the relation between metallicity, SFR and mass.