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Initial Mass Function Variability (or Not) among Low-velocity Dispersion, Compact Stellar Systems

  • Authors: Alexa Villaume, Jean Brodie, Charlie Conroy, Aaron J. Romanowsky, and Pieter van Dokkum

2017 The Astrophysical Journal Letters 850 L14.

  • Provider: AAS Journals

Caption: Figure 4.

Comparison of ﹩{({\text{}}{\rm{M}}/{\rm{L}})}_{\mathrm{dyn}}﹩ (gray) to ﹩{({\text{}}{\rm{M}}/{\rm{L}})}_{* }﹩ values for M31 GCs (left; purple), M59-UCD3 (middle; red), and M32 (right; green). In each panel we show the metallicity-dependent ﹩{({\text{}}{\rm{M}}/{\rm{L}})}_{* }﹩ predicted from SSPs with Kroupa IMF and solar-scaled abundance patterns. The ages of the SSPs (orange line) were chosen to approximate the inferred ages from our full-spectrum fitting. Our inferred ﹩{({\text{}}{\rm{M}}/{\rm{L}})}_{* }﹩ values for M59-UCD3 and M32 are consistent with available ﹩{({\text{}}{\rm{M}}/{\rm{L}})}_{\mathrm{dyn}}﹩ measurements. There remain inconsistencies between the dynamical and stellar measurements at high metallicity for the M31 GCs.

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