Astrophys. J., 817, 21 (2016/January-3)
Supermassive black holes and their host spheroids. II. The red and blue sequence in the MBH-M*,sphDiagram.
SAVORGNAN G.A.D., GRAHAM A.W., MARCONI A. and SANI E.
Abstract (from CDS):
In our first paper, we performed a detailed (i.e., bulge, disks, bars, spiral arms, rings, halo, nucleus, etc.) decomposition of 66 galaxies, with directly measured black hole masses, MBH, imaged at 3.6µm with Spitzer. Our sample is the largest to date and, for the first time, the decompositions were checked for consistency with the galaxy kinematics. We present correlations between MBH and the host spheroid (and galaxy) luminosity, Lsph(and Lgal), and also stellar mass, M*,sph. While most previous studies have used galaxy samples that were overwhelmingly dominated by high-mass, early-type galaxies, our sample includes 17 spiral galaxies, half of which have MBH < 107M☉ and allows us to better investigate the poorly studied low-mass end of the MBH-M*,sph correlation. The bulges of early-type galaxies follow MBH ∝ M*,sph1.04±0.10 and define a tight red sequence with intrinsic scatter ≡(MBH/M*,sph) = 0.43 ± 0.06 dex and a median MBH/M_*, sph_ ratio of 0.68±0.04%, i.e., a ± 2 σ range of 0.1%-5%. At the low-mass end, the bulges of late-type galaxies define a much steeper blue sequence, with MBH ∝ M*,sph2–3 and MBH/M*,sph equal to 0.02% at MBH ≈ 106 M☉ We additionally report that (1) our Sérsic galaxy sample follows MBH ∝ M*,sph1.48±0.20 a less steep sequence than previously reported; (2) bulges with Sérsic index nsph < 2 argued by some to be pseudo-bulges, are not offset to lower MBH from the correlation defined by the current bulge sample with nsph > 2; and (3) Lsphand Lgalcorrelate equally well with MBH, in terms of intrinsic scatter, only for early-type galaxies–once reasonable numbers of spiral galaxies are included, the correlation with Lsphis better than that with Lgal.
black hole physics - galaxies: bulges - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: structure
erratum vol. 821, art. 134 (2016)
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