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| Main Author: | |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.08076 |
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Table of Contents:
- Stellar mass and specific angular momentum are two properties of a galaxy that are directly related to its formation history, and hence morphology. In this work, the tight planar relationship between stellar specific angular momentum (j*), mass (M*) and mean effective surface brightness (mu_eff) that was recently constrained using ALFALFA galaxies is measured more accurately using galaxies from the Simba cosmological simulation. The distribution of 179 Simba galaxies in log(j*)-log(M*)-mu_eff space is shown to be very tightly planar with j* proportional to M*^0.694 and the distribution of perpendicular distances between the galaxies and the plane being approximately Gaussian with rms=0.057 dex. The parameterised distribution is used with existing j* and mu_eff measurements of 3607 ALFALFA galaxies and 84 SPARC galaxies to reliably predict their published stellar masses to within ~0.1 to 0.2 dex over several decades of stellar mass. Thus, this work presents a new method of easily generating accurate galaxy stellar mass estimates for late-type galaxies and provides a new measurement of the fundamental link between galaxy morphology, mass and angular momentum.