TY - JOUR
T1 - z\sim2 dual AGN host galaxies are disky: stellar kinematics in the ASTRID Simulation
AU - Dadiani, Ekaterine
AU - Di Matteo, Tiziana
AU - Chen, Nianyi
AU - Lachance, Patrick
AU - Shen, Yue
AU - Chen, Yu Ching
AU - Croft, Rupert
AU - Ni, Yueying
AU - Bird, Simeon
N1 - Publisher Copyright:
© 2024, National University of Ireland Maynooth. All rights reserved.
PY - 2024
Y1 - 2024
N2 - We study dual AGN host galaxy morphologies at z = 2 using the ASTRID simulation, selecting black hole (BH) pairs with small separation (∆r < 30kpc), high mass (MBH,12 > 107 M⊙), and luminosity (Lbol,12 > 1043 erg/s). We kinematically decompose (using MORDOR) ~ 1000 dual AGN hosts into standard components-a ‘disk’ (thin and thick disk, pseudo-bulge) and ‘spheroids’ (bulge and stellar spheroidal halo) and define disk-dominated galaxies by the disk-to-total D/T ≥ 0.5. In ASTRID, 60.9±2.1% of dual AGN hosts (independent of separation) are disk-dominated, with the D/T distribution peaking at ~ 0.7. In dual-AGN hosts, the D/T increases from ~ 17% at M* ~ 109 M⊙ to 64% for M* ~ 1011.5 M⊙, and the pseudo-bulge is the dominant component of the disk fraction at the high mass end. Moreover, dual AGN hosts exhibit a higher fraction of disk/large pseudo-bulge than single-AGN hosts. The Disk-to-Total ratio is approximately constant with BH mass or AGN luminosity. We also create mock images of dual AGN host galaxies, employing morphological fitting software Statmorph to calculate morphological parameters and compare them with our kinematic decomposition results. Around 83.3±2.4% of galaxies display disk-like profiles, of which ~ 60.7±2.2% are kinematically confirmed as disks. Seŕsic indices and half-mass radii of dual AGN host galaxies align with observational measurements from HST at z ~ 2. Around 34% are identified as mergers from the Gini − M20 relation. We find two dual AGN hosted by galaxies that exhibit disk-like seŕsic index n12 < 1 and (D/T )12 > 0.5, which are in remarkable agreement with properties of recently discovered dual quasars in disk galaxies at z ~ 2.
AB - We study dual AGN host galaxy morphologies at z = 2 using the ASTRID simulation, selecting black hole (BH) pairs with small separation (∆r < 30kpc), high mass (MBH,12 > 107 M⊙), and luminosity (Lbol,12 > 1043 erg/s). We kinematically decompose (using MORDOR) ~ 1000 dual AGN hosts into standard components-a ‘disk’ (thin and thick disk, pseudo-bulge) and ‘spheroids’ (bulge and stellar spheroidal halo) and define disk-dominated galaxies by the disk-to-total D/T ≥ 0.5. In ASTRID, 60.9±2.1% of dual AGN hosts (independent of separation) are disk-dominated, with the D/T distribution peaking at ~ 0.7. In dual-AGN hosts, the D/T increases from ~ 17% at M* ~ 109 M⊙ to 64% for M* ~ 1011.5 M⊙, and the pseudo-bulge is the dominant component of the disk fraction at the high mass end. Moreover, dual AGN hosts exhibit a higher fraction of disk/large pseudo-bulge than single-AGN hosts. The Disk-to-Total ratio is approximately constant with BH mass or AGN luminosity. We also create mock images of dual AGN host galaxies, employing morphological fitting software Statmorph to calculate morphological parameters and compare them with our kinematic decomposition results. Around 83.3±2.4% of galaxies display disk-like profiles, of which ~ 60.7±2.2% are kinematically confirmed as disks. Seŕsic indices and half-mass radii of dual AGN host galaxies align with observational measurements from HST at z ~ 2. Around 34% are identified as mergers from the Gini − M20 relation. We find two dual AGN hosted by galaxies that exhibit disk-like seŕsic index n12 < 1 and (D/T )12 > 0.5, which are in remarkable agreement with properties of recently discovered dual quasars in disk galaxies at z ~ 2.
KW - Active Galactic Nuclei
KW - Cosmological Simulations
KW - High-Redshift
KW - Morphology
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U2 - 10.33232/001c.124451
DO - 10.33232/001c.124451
M3 - Article
AN - SCOPUS:85207190379
SN - 2565-6120
VL - 7
JO - Open Journal of Astrophysics
JF - Open Journal of Astrophysics
ER -