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2020ApJ...903...97S - Astrophys. J., 903, 97-97 (2020/November-2)

Defining the (black hole)-spheroid connection with the discovery of morphology-dependent substructure in the MBH-nsph and MBH-Re,sph diagrams: new tests for advanced theories and realistic simulations.

SAHU N., GRAHAM A.W. and DAVIS B.L.

Abstract (from CDS):

For 123 local galaxies with directly measured black hole masses (MBH), we provide the host spheroid's Sersic index (nsph), effective half-light radius (Re,sph), and effective surface brightness (µe), obtained from careful multicomponent decompositions, and we use these to derive the morphology-dependent MBH-nsph and MBH-Re,sph relations. We additionally present the morphology-dependent M*,sph-nsph and M*,sph-Re,sph relations. We explored differences due to early-type galaxies (ETGs) versus late-type galaxies (LTGs), Sersic versus core-Sersic galaxies, barred versus non-barred galaxies, and galaxies with and without a stellar disk. We detect two different MBH-nsph relations due to ETGs and LTGs with power-law slopes 3.95 ± 0.34 and 2.85 ± 0.31. We additionally quantified the correlation between MBH and the spheroid's central concentration index, which varies monotonically with the Sersic index. Furthermore, we observe a single, near-linear M*,sph-Re,sph^1.08±0.04^ relation for ETGs and LTGs, which encompasses both classical and alleged pseudobulges. In contrast, ETGs and LTGs define two distinct MBH-Re,sph relations with Δ_rms| BH_∼0.60dex (cf. ∼0.51 dex for the MBH-σ relation and ∼0.58 dex for the MBH-M*,sph relation), and the ETGs alone define two steeper MBH-Re,sph relations, offset by ∼1 dex in the logMBH direction, depending on whether they have a disk or not and explaining their similar offset in the MBH-M*,sph diagram. This trend holds using 10%, 50%, or 90% radii. These relations offer pivotal checks for simulations trying to reproduce realistic galaxies, and for theoretical studies investigating the dependence of black hole mass on basic spheroid properties.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy evolution - Supermassive black holes - Galaxy structure - Galaxy bulges - Galaxy spheroids - Early-type galaxies - Late-type galaxies - Spiral galaxies - Scaling relations - Black Hole physics

Simbad objects: 126

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2021.04.15-05:08:40

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