The art of measuring galaxy physical properties скачать в хорошем качестве

The art of measuring galaxy physical properties

Camilla Pacifici (STScI, USA) One of the most common approaches to measure stellar masses and other physical parameters for galaxies is spectral energy distribution (SED) fitting. This consists of comparing the light from galaxies with templates for which we know the physical parameters and extract the best template match or probability distribution functions of the parameters associated with such templates. Many years ago, when we were looking predominately at local galaxies and the observations consisted of a few photometric bands, SED fitting was considered a relatively simple job. In recent years, ground-based and space telescopes have given us a whole new set of information, with both photometry and spectroscopy for a large number of galaxies at all redshifts. Such quantity and quality of data require more and more advanced tools to make the most of the observations. Here is when SED fitting becomes a complicated job, or an Art! I will present to you the various ingredients and complexities that go into state-of-the-art SED fitting tools, what parameters we can now measure, and how we can assess the uncertainties in the modeling approach. July 10, 2023