SIMBAD references

2012ApJ...755..163D - Astrophys. J., 755, 163 (2012/August-3)

Sizing up partially depleted galaxy cores.


Abstract (from CDS):

We have modeled the inner surface brightness profiles of 39 alleged "core" galaxies with the core-Sérsic model, and provide new physical parameters for the largest ever sample of "core" galaxies fit with this model. When present, additional nuclear components were simultaneously modeled and the typical root-mean-square scatter of the fits (out to ∼10'') is 0.02 mag/arcsec2. Model-independent estimates of each core's break radius are shown to agree with those from the core-Sérsic model, and a comparison with the Nuker model is provided. We found an absence of cores in what amounts to 18% of the sample, which are reclassified here as Sérsic galaxies with low values of n ( ≲ 4) and thus shallow inner profile slopes. In general, galaxies with n < 3 and σ < 183 km/s do not have depleted cores. We derive updated relations between core-Sérsic break radii, their associated surface brightness, bulge luminosity, central velocity dispersion, and predicted black hole mass for galaxies with depleted cores. With the possible exception of NGC 584, we confirm that the inner negative logarithmic profile slopes γ are ≲ 0.3 for the "core" galaxies, and 0 > γ > -0.1 for six of these. Finally, the central stellar mass deficits are found to have values typically within a factor of four of the expected central black hole mass.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: nuclei - galaxies: photometry - galaxies: structure

Simbad objects: 45

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