Correlations between Black Holes and Host Galaxies in the Illustris and IllustrisTNG Simulations
Name
Li_2020_ApJ_895_102.pdf
Description
Published version
Size
2.55 MB
Format
Adobe PDF
Checksum (MD5)
1c6d825885d3f9c19cffe38e05a8193e
Author(s)
Li, Yuan
Habouzit, Melanie
Genel, Shy
Somerville, Rachel
Terrazas, Bryan A
Bell, Eric F
Pillepich, Annalisa
Nelson, Dylan
Weinberger, Rainer
Rodriguez-Gomez, Vicente
Date Issued
2020
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Version
Final published version
Abstract
© 2020. The American Astronomical Society. All rights reserved. We study black hole-host galaxy correlations, and the relation between the overmassiveness (the distance from the average M BH-σ relation) of supermassive black holes (SMBHs) and the star formation histories of their host galaxies in the Illustris and TNG100 simulations. We find that both simulations are able to produce black hole scaling relations in general agreement with observations at z = 0, but with noticeable discrepancies. Both simulations show an offset from the observations for the M BH-σ relation, and the relation between M BH and the Sérsic index. The relation between M BH and stellar mass M ∗ is tighter than the observations, especially for TNG100. For massive galaxies in both simulations, the hosts of overmassive SMBHs (those above the mean M BH-σ relation) tend to have larger Sérsic indices and lower baryon conversion efficiency, suggesting a multidimensional link between SMBHs and the properties of their hosts. In Illustris, the hosts of overmassive SMBHs have formed earlier and have lower present-day star formation rates, in qualitative agreement with the observations for massive galaxies with σ > 100 km s-1. For low-mass galaxies, such a correlation still holds in Illustris but does not exist in the observed data. For TNG100, the correlation between SMBH overmassiveness and star formation history is much weaker. The hosts of overmassive SMBHs generally have consistently larger star formation rates throughout history. These galaxies have higher stellar mass as well, due to the strong M BH-M ∗ correlation. Our findings show that simulated SMBH scaling relations and correlations are sensitive to features in the modeling of SMBHs.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/1538-4357/AB8F8D
