Document Type
Article
Publication Date
1-29-2014
Abstract
We compile a sample of dispersion-supported and rotation-supported galaxies for which the dynamical mass enclosed at 500 pc can be measured. We find that this dynamical quantity increases only slowly with stellar mass (Mtotal(500 pc) ? M0.16 stars ) over ?9 decades in baryonic mass and ?3 in length scale, with a sudden upturn at the highest masses (Mstars - 1010 M-). This upturn occurs for the earliest types (S0 and Sa) of disk galaxies, and is consistent with the extra mass within 500 pc being predominantly stellar. This sudden change may be indicative of different bulge formation mechanisms between early- and late-type disks.We also compare the data to the results of recent galaxy formation simulations. These broadly track the observed trend, with some tendency to put too much mass in the inner 500 pc, depending on the details of each simulation.©2014. The American Astronomical Society. All rights reserved.
Keywords
galaxies: formation, galaxies: structure
Publication Title
Astrophysical Journal Letters
Rights
© The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material
Recommended Citation
The Inner Dynamical Mass Across Galaxy Morphology: A weak Scaling with Total Stellar Mass. Rachel Kuzio de Naray and Stacy S. McGaugh 2014 ApJL 782 L12
Manuscript Version
Final Publisher Version