Synthetic JWST/MIRI fluxes and magnitudes

Using the rich Spitzer-IRS spectroscopic data set and spectral classifications from the Surveying the Agents of Galaxy Evolution (SAGE)-Spectroscopic survey of more than 1000 objects in the Magellanic Clouds, the Grid of Red Supergiant and Asymptotic Giant Branch Star Model (GRAMS; Sargent+ 2011ApJ...728...93S and Srinivasan+ 2011, J/A+A/532/A54), and the grid of YSO models by Robitaille+ (2006ApJS..167..256R), we calculate the expected flux densities and colors in the MIRI broadband filters for prominent infrared stellar populations.

We use these fluxes to explore the JWST/MIRI colors and magnitudes for composite stellar population studies of Local Volume galaxies. MIRI color classification schemes are presented; these diagrams provide a powerful means of identifying young stellar objects, evolved stars, and extragalactic background galaxies in Local Volume galaxies with a high degree of confidence. Finally, we examine which filter combinations are best for selecting populations of sources based on their JWST colors.