The sequence of spiral arm classes: Observational signatures of persistent spiral density waves in grand-design galaxies
| Autor: | Bittner, A., Gadotti, D. A., Elmegreen, B. G., Athanassoula, E., Elmegreen, D. M., Bosma, A., Munoz-Mateos, J. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1017/S1743921319008160 |
| Popis: | We investigate how the properties of spiral arms relate to other fundamental galaxy properties. To this end, we use previously published measurements of those properties, and our own measurements of arm-interarm luminosity contrasts for a large sample of galaxies, using 3.6$\mu$m images from the Spitzer Survey of Stellar Structure in Galaxies. Flocculent galaxies are clearly distinguished from other spiral arm classes, especially by their lower stellar mass and surface density. Multi-armed and grand-design galaxies are similar in most of their fundamental parameters, excluding some bar properties and the bulge-to-total luminosity ratio. Based on these results, we discuss dense, classical bulges as a necessary condition for standing spiral wave modes in grand-design galaxies. We further find a strong correlation between bulge-to-total ratio and bar contrast, and a weaker correlation between arm and bar contrasts. Comment: 4 pages, 3 figures, to appear in Galactic Dynamics in the Era of Large Surveys, M. Valluri & J. A. Sellwood (eds.) |
| Databáze: | arXiv |
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