Mbulge: A simulation study
نویسندگان
چکیده
The dynamical evolution of super star clusters (SSCs) moving in the background of dark matter halo has been investigated as a possible event causing the observed correlation between the mass of galactic bulge, Mbulge, and the mass of its central black hole, MBH . The involved physical processes are the sinking of SSCs due to the dynamical friction, and the stripping of SSCs on their way to the center. Model calculations show that only sinking of circumnuclear SSCs contribute to both the growth of the central object and the formation of the galactic bulge at the early stage. On the assumption of a universal density profile for the dark matter halo, and an isothermal model for the SSCs, our simulations have yielded the mass ratio of the central objects to the bulges formed this way to be about a few times 10, less than the observed median value for early type galaxies. It is, however, consistent with the observed mass ratio for disk spirals, implying that the proposed scenario might be a possible event for the formation of bulges and central black holes of late type galaxies and for MBH − Mbulge correlation of disk galaxies.
منابع مشابه
Black Hole – Bulge Relation for Narrow-Line Objects
It has been thought that narrow-line Seyfert 1 galaxies are likely to be in the early stages of the evolution of active galaxies. To test this suggestion, the ratios of the central massive black hole (MBH) mass to the bulge mass (Mbh/Mbulge) were estimated for 22 Narrow Line AGNs (NL AGNs). It is found that NL AGNs appear to have genuinely lower MBH/Bulge mass ratio (Mbh/Mbulge). The mean log(M...
متن کاملEvolution in the black hole mass–bulge mass relation: a theoretical perspective
We explore the growth of super-massive black holes and host galaxy bulges in the galaxy population using the Millennium Run ΛCDM simulation coupled with a model of galaxy formation. We find that, if galaxy mergers are the primary drivers for both bulge and black hole growth, then in the simplest picture one should expect the mBH – mbulge relation to evolve with redshift, with a larger black hol...
متن کاملHow Mergers May Affect the Mass Scaling Relations between Massive Black Holes, Galaxies, and Other Gravitationally Bound Systems
Supermassive black hole masses (BH, MBH) are strongly correlated with galaxy stellar bulge masses (Mbulge) and there are several ideas to explain the origin of this relationship. One possibility is by simple mass additions through galaxy mergers. Though unintuitive, this study shows that a linear BH-galaxy mass relation (MBH-Mgal), in which MBH-Mbulge is a special case, would emerge even if pri...
متن کاملOn the Linearity of the Black Hole - Bulge Mass Relation in Active and in Nearby Galaxies
Analysis of PG quasar observations suggests a nonlinear relation between the black hole mass, MBH, and the bulge mass, Mbulge, although a linear relation, as proposed for nearby galaxies, cannot be ruled out. New MBH values for nearby galaxies from Gebhardt et al., and Lbulge measurements for Seyfert 1 galaxies from Virani et al., are used here to obtain a more accurate value for the slope of t...
متن کاملRelationship of Black Holes to Bulges
Supermassive black holes appear to be uniquely associated with galactic bulges. The mean ratio of black hole mass to bulge mass was until recently very uncertain, with ground based, stellar kinematical data giving a value for 〈M•/Mbulge〉 roughly an order of magnitude larger than other techniques. The discrepancy was resolved with the discovery of the M• − σ relation, which simultaneously establ...
متن کامل