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Journal Articles The Astrophysical Journal Year : 2020

Quenching as a Contest between Galaxy Halos and Their Central Black Holes

Zhu Chen
  • Function : Author
S. M. Faber
  • Function : Author
David C. Koo
  • Function : Author
Rachel S. Somerville
  • Function : Author
Joel R. Primack
  • Function : Author
Avishai Dekel
  • Function : Author
Aldo Rodríguez-Puebla
Yicheng Guo
  • Function : Author
Guillermo Barro
  • Function : Author
Dale D. Kocevski
  • Function : Author
A. van der Wel
  • Function : Author
Joanna Woo
  • Function : Author
Eric F. Bell
  • Function : Author
Jerome J. Fang
  • Function : Author
Henry C. Ferguson
  • Function : Author
Mauro Giavalisco
  • Function : Author
Fangzhou Jiang
  • Function : Author
Susan Kassin
  • Function : Author
Lin Lin
  • Function : Author
F. S. Liu
  • Function : Author
Yifei Luo
  • Function : Author
Zhijian Luo
  • Function : Author
Camilla Pacifici
  • Function : Author
Viraj Pandya
  • Function : Author
Samir Salim
  • Function : Author
Chenggang Shu
  • Function : Author
Sandro Tacchella
  • Function : Author
Bryan A. Terrazas
  • Function : Author
Hassen M. Yesuf
  • Function : Author

Abstract

Existing models of galaxy formation have not yet explained striking correlations between structure and star formation activity in galaxies, notably the sloped and moving boundaries that divide star-forming from quenched galaxies in key structural diagrams. This paper uses these and other relations to "reverse engineer" the quenching process for central galaxies. The basic idea is that star-forming galaxies with larger radii (at a given stellar mass) have lower black hole (BH) masses due to lower central densities. Galaxies cross into the green valley when the cumulative effective energy radiated by their BH equals ∼4× their halo gas-binding energy. Because larger-radii galaxies have smaller BHs, one finds that they must evolve to higher stellar masses in order to meet this halo energy criterion, which explains the sloping boundaries. A possible cause of radii differences among star-forming galaxies is halo concentration. The evolutionary tracks of star-forming galaxies are nearly parallel to the green-valley boundaries, and it is mainly the sideways motions of these boundaries with cosmic time that cause galaxies to quench. BH scaling laws for star-forming, quenched, and green-valley galaxies are different, and most BH mass growth takes place in the green valley. Implications include the radii of star-forming galaxies are an important second parameter in shaping their BHs; BHs are connected to their halos but in different ways for star-forming, quenched, and green-valley galaxies; and the same BH-halo quenching mechanism has been in place since z ∼ 3. We conclude with a discussion of BH-galaxy coevolution and the origin and interpretation of BH scaling laws.

Dates and versions

insu-03718040 , version 1 (08-07-2022)

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Cite

Zhu Chen, S. M. Faber, David C. Koo, Rachel S. Somerville, Joel R. Primack, et al.. Quenching as a Contest between Galaxy Halos and Their Central Black Holes. The Astrophysical Journal, 2020, 897, ⟨10.3847/1538-4357/ab9633⟩. ⟨insu-03718040⟩
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