Orateur
Description
Galaxies in voids have experienced a different environment than non-void galaxies during their entire existence. Their properties are possibly different from non-void galaxies, however, systematic studies have been missing for a long time. The Legacy Survey CAVITY (Calar Alto Void Treasury Integral-field Survey) aims to fill this gap. It will observe about 300 carefully selected void galaxies with the PMAS integral field spectrograph at the Calar Alto 3.5m telescope which will allow to derive the star formation histories, ionised gas properties and dynamical mass, including the amount of dark matter.
In order to fully characterise and understand void galaxies, in particular how star formation proceeds, we need to know its molecular gas content. To fill this gap, we are observing a sample of $\sim$ 130 CAVITY galaxies with the EMIR receiver at the IRAM 30m telescope in Pico Veleta targeting the CO(1-0) and CO(2-1) lines. The data will allow us to derive the SFE (=SFR/molecular gas mass), molecular-to-atomic gas mass ratio and molecular-to-stellar mass ratio. Comparing the combined results from the CO(1-0) and CO(2-1) and, once available, IFU data with non-void galaxies will allow us to better understand the influence that the low-density environment has on the molecular gas content and the process of star formation.
The analysis of the CO data is in full progress and we will present first results.
