Formation and Assembly History of Stellar Components in Galaxies as a Function of Stellar and Halo Mass

Jaehyun Lee, Sukyoung K. Yi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Galaxy mass assembly is an end product of structure formation in the ΛCDM cosmology. As an extension of Lee & Yi, we investigate the assembly history of stellar components in galaxies as a function of halo environments and stellar mass using semi-analytic approaches. In our fiducial model, halo mass intrinsically determines the formation and assembly of the stellar mass. Overall, the ex situ fraction slowly increases in central galaxies with increasing halo mass but sharply increases for . A similar trend is also found in satellite galaxies, which implies that mergers are essential to build stellar masses above . We also examine the time evolution of the contribution of mass growth channels. Mergers become the primary channel in the mass growth of central galaxies when their host halo mass begins to exceed . However, satellite galaxies seldom reach the merger-dominant phase despite their reduced star-formation activities due to environmental effects.

Original languageEnglish
Article number161
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 2017 Feb 20

Bibliographical note

Funding Information:
We thank Rory Smith for his constructive comments and proofreading. We acknowledge the support from the National Research Foundation of Korea (NRF-2014R1A2A1A01003730). Numerical simulations were performed using the KISTI supercomputer under the programme of KSC-2014-G2-003.

Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved..

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Formation and Assembly History of Stellar Components in Galaxies as a Function of Stellar and Halo Mass'. Together they form a unique fingerprint.

Cite this