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2019ApJ...886...80D - Astrophys. J., 886, 80-80 (2019/December-1)

The most massive galaxies with large depleted cores: structural parameter relations and black hole masses.


Abstract (from CDS):

Luminous spheroids (MV <= -21.50 ± 0.75 mag) contain partially depleted cores with sizes (Rb) typically 0.02-0.5 kpc. However, galaxies with Rb > 0.5 kpc are rare and poorly understood. Here, we perform detailed decompositions of the composite surface brightness profiles, extracted from archival Hubble Space Telescope and ground-based images, of 12 extremely luminous "large-core" galaxies that have Rb > 0.5 kpc and MV <= -23.50 ± 0.10 mag, fitting a core-Sersic model to the galaxy spheroids. Using 28 "normal-core" (i.e., Rb < 0.5 kpc) galaxies and one "large-core" (i.e., Rb > 0.5 kpc) galaxy from the literature, we constructed a final sample of 41 core-Sersic galaxies. We find that large-core spheroids (with stellar masses M* >= 1012M) are not simple high-mass extensions of the less luminous normal-core spheroids having M* ∼ 8 x 1010-1012M. While the two types follow the same strong relations between the spheroid luminosity LV and Rb (Rb∝LV^1.38±0.13^), and the spheroid half-light radius Re (Re∝LV^1.08±0.09^, for ellipticals plus Brightest Cluster Galaxies), we discover a break in the core-Sersic σ-LV relation occurring at MV ∼ -23.50 ± 0.10 mag. Furthermore, we find a strong log-linear Rb-MBH relation for the 11 galaxies in the sample with directly determined supermassive black hole (SMBH) masses MBH-3/11 galaxies are large-core galaxies-such that Rb∝MBH^0.83±0.10^. However, for the large-core galaxies the SMBH masses estimated from the MBH-σ and core-Sersic MBH-L relations are undermassive, by up to a factor of 40, relative to expectations from their large Rb values, confirming earlier results. Our findings suggest that large-core galaxies harbor overmassive SMBHs (MBH >= 1010M), considerably (∼3.7-15.6σ and ∼0.6-1.7σ) larger than expectations from the spheroid σ and L, respectively. We suggest that the Rb-MBH relation can be used to estimate SMBH masses in the most massive galaxies.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Supermassive black holes - cD galaxies - Elliptical galaxies - Lenticular galaxies - Galaxy photometry - Galaxy nuclei - Galaxy structure

Simbad objects: 34

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