SIMBAD references

2016ApJ...818..172G - Astrophys. J., 818, 172 (2016/February-3)

Does the intermediate-mass black hole in LEDA 87300 (RGG 118) follow the near-quadratic MBH-MSpheroidRelation?


Abstract (from CDS):

The mass scaling relation between supermassive black holes and their host spheroids has previously been described by a quadratic or steeper relation at low masses (105 < Mbh/M≲ 107). How this extends into the realm of intermediate-mass black holes (102 < Mbh/M< 105) is not yet clear, although for the barred Sm galaxy LEDA 87300, Baldassare et al. recently reported a nominal virial mass of Mbh= 5x104 M residing in a ''spheroid'' of stellar mass equal to 6.3x108 M. We point out, for the first time, that LEDA 87300 therefore appears to reside on the near-quadratic Mbh-Msph,*relation. However, Baldassare et al. modeled the bulge and bar as the single spheroidal component of this galaxy. Here we perform a 3-component bulge+bar+disk decomposition and find a bulge luminosity which is 7.7 times fainter than the published ''bulge'' luminosity. After correcting for dust, we find that Mbulge= 0.9x108 Mand Mbulge/Mdisk= 0.04–which is now in accord with ratios typically found in Scd-Sm galaxies. We go on to discuss slight revisions to the stellar velocity dispersion (40±11 km/s) and black hole mass (Mbh = 2.9–2.3+6.7 x 104f2.3 M) and show that LEDA 87300 remains consistent with the Mbh-σ relation, and also the near-quadratic Mbh-Msph,* relation when using the reduced bulge mass. LEDA 87300 therefore offers the first support for the rapid but regulated (near-quadratic) growth of black holes, relative to their host bulge/spheroid, extending into the domain of intermediate-mass black holes.

Abstract Copyright:

Journal keyword(s): black hole physics - galaxies: elliptical and lenticular, cD - galaxies: individual: LEDA 087300 - galaxies: nuclei - galaxies: photometry - galaxies: structure

Simbad objects: 13

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