2026-10-02T10:17:05Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/79702024-09-10T17:54:08Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Dullo, Bililign
author
Gil De Paz, Armando
author
Knapen, Johan H.
2023-06-17T09:01:42Z
2023-06-17T09:01:42Z
2021-02
0004-637X
10.3847/1538-4357/abceae
https://hdl.handle.net/20.500.14352/7970
http://dx.doi.org/10.3847/1538-4357/abceae
https://iopscience.iop.org/https://arxiv.org/abs/2012.04471v1
We investigate the nature of the relations between black hole (BH) mass (M_(BH)) and the central velocity dispersion (σ) and, for core-S´ersic galaxies, the size of the depleted core (R_(b)). Our sample of 144 galaxies with dynamically determined M_(BH) encompasses 24 core-Sérsic galaxies, thought to be products of gas-poor mergers, and reliably identified based on high-resolution HST imaging. For core-S´ersic galaxies—i.e., combining normal-core (R_(b) < 0.5 kpc) and large-core galaxies (R_(b) ˃̰ 0.5 kpc), we find that M_(BH) correlates remarkably well with R_(b) such that M_(BH) ∝ R^(1.20±0.14)_(b) (rms scatter in log M_(BH) of ∆_(rms) ∼ 0.29 dex), confirming previous works on the same galaxies except three new ones. Separating the sample into S´ersic, normal-core and large-core galaxies, we find that S´ersic and normal-core galaxies jointly define a single log-linear M_(BH) − σ relation M_(BH) ∝ σ^(4.88±0.29) with ∆_(rms) ∼ 0.47 dex, however, at the high-mass end large-core galaxies (four with measured M_(BH)) are offset upward from this relation by (2.5 − 4) × σ_(s), explaining the previously reported steepening of the M_(BH) − σ relation for massive galaxies. Large-core spheroids have magnitudes M_(V) ˂̰ −23.50 mag, half-light radii R_(e) ˃̰ 10 kpc and are extremely massive M * ˃̰ 10^(12)Mꙩ. Furthermore, these spheroids tend to host ultramassive BHs (M_(BH) ˃̰ 10^(10)Mꙩ) tightly connected with their R_(b) rather than σ. The less popular M_(BH) – R_(b) relation exhibits ∼ 62% less scatter in log M_(BH) than the M_(BH – σ) relations. Our findings suggest that large-core spheroids form via multiple major ‘dry’ merger events involving super/ultramassive BHs, consistent with the flattening of the σ – L_(V) relation observed at M_(V) ˂̰ −23.5 mag.
eng
Ultramassive black holes in the most massive galaxies: M_(BH – σ) versus M_(BH) – R_(B)
journal article
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https://docta.ucm.es/bitstreams/8435631b-d7ba-460d-a0ee-a9ca2d52d263/download
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dullo02preprint.pdf
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95223b2d036699875862908704ff1e70
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dullo02preprint.pdf.txt