Séminaire Doctoral / Seminar PhD |
| « The morphologies of galaxies tell the story of their evolution » |
|
Louis Quilley |
| In 1926, Edwin Hubble classified galaxies according to the shapes and features he observed. If the Hubble sequence remains the gold-standard of galaxy morphology, the usual evolutionary picture of star-forming spirals merging into passive ellipticals did not encompass the whole diversity of morphological types. Using SourceXtractor++, I decompose 4458 nearby galaxies from the EFIGI catalog as a bulge and a disk, to characterize more quantitatively their morphologies. In the color-mass plane, I bring to light a continuous sequence of subsequent Hubble types, which appears governed by the bulge-to-total luminosity and mass ratios, as well as the disk color. The Hubble sequence can then be considered as an inverse sequence of galaxy physical evolution. |
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vendredi 16 décembre 2022 - 16:00 Salle du Conseil, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |