Linking galaxy structural properties and star formation activity to black hole activity with IllustrisTNG
Name
1809.05588.pdf
Description
Accepted version
Size
3.96 MB
Format
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Checksum (MD5)
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Author(s)
Habouzit, Mélanie
Genel, Shy
Somerville, Rachel S
Kocevski, Dale
Hirschmann, Michaela
Dekel, Avishai
Choi, Ena
Nelson, Dylan
Pillepich, Annalisa
Hernquist, Lars
Date Issued
January 16, 2019
Journal
Monthy Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Citation
Habouzit, Mélanie, et al. “Linking Galaxy Structural Properties and Star Formation Activity to Black Hole Activity with IllustrisTNG.” Monthly Notices of the Royal Astronomical Society, 484, 4 (April 2019): 4413–43. © 2019 The Authors
Version
Author's final manuscript
Abstract
We study the connection between active galactic nuclei (AGN) and their host galaxies through cosmic time in the large-scale cosmological IllustrisTNG simulations. We first compare BH properties, i.e. the hard X-ray BH luminosity function, AGN galaxy occupation fraction, and distribution of Eddington ratios, to available observational constraints. The simulations produce a population of BHs in good agreement with observations, but we note an excess of faint AGN in hard X-ray (L[subscript x] ∼ 10[superscript 43-44] rm erg/s), and a lower number of bright AGN (L[subscript x] > 110[superscript 44] rm erg/s), a conclusion that varies quantitatively but not qualitatively with BH luminosity estimation method. The lower Eddington ratios of the 10[superscript 9] M[subscript ⊙] BHs compared to observations suggest that AGN feedback may be too efficient in this regime. We study galaxy star formation activity and structural properties, and design sample-dependent criteria to identify different galaxy types (star-forming/quiescent, extended/compact) that we apply both to the simulations and observations from the candels fields. We analyse how the simulated and observed galaxies populate the specific star formation rate - stellar mass surface density diagram. A large fraction of the z = 0 M{subscript *] > 10[superscript 11] M[subscript ⊙] quiescent galaxies first experienced a compaction phase (i.e. reduction of galaxy size) while still forming stars, and then a quenching event. We measure the dependence of AGN fraction on galaxies' locations in this diagram. After correcting the simulations with a redshift and AGN luminosity-dependent model for AGN obscuration, we find good qualitative and quantitative agreement with observations. The AGN fraction is the highest among compact star-forming galaxies (16-20% at z ∼1.5-2), and the lowest among compact quiescent galaxies (6-10 rm per cent at z ∼ 1.5-2). Key words: galaxies: formation - galaxies: evolution - methods: numerical
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/10.1093/mnras/stz102
