Definitive view of the ISM in the Local Universe

Viviana Casasola
2020 Zenodo  
Understanding the interplay between the various components of the interstellar medium (ISM: dust, atomic and molecular gas) in galaxies of the Local Universe is of fundamental importance for studies of galactic formation and evolution. In the last decade, thanks in particular to Herschel, we made a considerable effort in the study of one of these components, the dust. In this framework, the European DustPedia project has been devised aimed at performing a complete characterization of dust in
more » ... ation of dust in the Local Universe. However, we need information on all the phases of the ISM to draw definitive conclusions on it. Nearby galaxies are characterized by an intricate system of correlations between their global properties. These correlations form the basis of the so-called 'scaling relations', which are fundamental providing a quantitative mean to characterize how physical properties of galaxies relate to each other. Galaxy scaling relations also provide a tool to study the internal physics of galaxies, as well as their formation and evolutionary histories in different galaxy populations. I present the main scaling relations computed using uniformly homogenized data of molecular and atomic gas, dust, metallicity, stellar mass, and morphology for a sample of ~450 nearby (z<0.01), late-type galaxies extracted from the DustPedia sample. These scaling relations have been tested under several physical assumptions (e.g., constant and metallicity-dependent CO-to-H2 conversion factor). Only such a large and coherent dataset of all phases of the ISM can provide a definitive view of the ISM in the Local Universe and permit to link it with that at high redshift, tracing its evolution. ALMA is revealing the molecular gas component and the dust at (sub-)millimeter wavelengths, while telescopes as JVLA and, in future, SKA detect the atomic gas component (the 21 cm emission line). Our approach therefore represents a example of synergy between current and future IR/(sub-)mm/cm facilities which allows us to discuss, through the ISM, our und [...]
doi:10.5281/zenodo.3629109 fatcat:nib3ojilg5gsheue3yiykvsqgi