Globular Cluster — Bulge connection: Population synthesis models with multiple populations

Recent analyses of Lee et al. (2018, 2019) have confirmed that Galactic bulge consists of stellar populations originated from Milky Way globular clusters (MWGCs). Motivated by this, here we present the evolutionary population synthesis (EPS) for the Galactic bulge and early-type galaxies (ETGs) with...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2019-05, Vol.14 (S351), p.277-280
Main Authors: Chung, Chul, Lee, Young-Wook, Lim, Dongwook, Hong, Seungsoo, Kim, Jenny J., Kang, Yijung, Yoon, Suk-Jin
Format: Article
Language:English
Subjects:
Astronomical models
Astronomy
Celestial bodies
Galactic bulge
Galactic clusters
Galactic evolution
Galaxies
Globular clusters
Light elements
Milky Way
Stellar populations
Synthesis
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Summary:Recent analyses of Lee et al. (2018, 2019) have confirmed that Galactic bulge consists of stellar populations originated from Milky Way globular clusters (MWGCs). Motivated by this, here we present the evolutionary population synthesis (EPS) for the Galactic bulge and early-type galaxies (ETGs) with the realistic treatment of individual variations in light elements observed in the MWGCs. We have utilized our model with GC-origin populations to explain the CN spread observed in ETGs, and the results show remarkable matches with the observations. We further employ our model to estimate the age of ETGs, which are considered as good analogs for the MW bulge. We find that, without the effect of our new treatments, EPS models will almost always underestimate the true age of ETGs. Our analysis indicates that the EPS with GC-origin populations is an essential constraint in determining the ETG formation epoch and is closely related to understanding the evolution of the Universe.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921319007038