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Outflow-Dominated Emission from the Quiescent Massive Black Holes in NGC 4621 and NGC 4697
J. M. Wrobel, Y. Terashima, L. C. Ho
The nearby elliptical galaxies NGC 4621 and NGC 4697 each host a supermassive black hole with a mass more than 1e8 Solar masses. Analysis of archival Chandra data and new NRAO Very…
The Black Hole Mass and Extreme Orbital Structure in NGC1399
Karl Gebhardt, Tod R. Lauer, Jason Pinkney +12
The largest galaxies, and in particular central galaxies in clusters, offer unique insight into understanding the mechanism for the growth of nuclear black holes. We present Hubble…
A supermassive binary black hole with triple disks
Kimitake Hayasaki, Shin Mineshige, Luis C. Ho
Hierarchical structure formation inevitably leads to the formation of supermassive binary black holes (BBHs) with a sub-parsec separation in galactic nuclei. However, to date there…
The radio properties of type II quasars
Dharam Vir Lal, Luis C. Ho
Quasars (of type I) are the luminous analogs of type I Seyfert galaxies. Within the framework of unified models of active galaxies, the population of quasars of type II recently di…
Radio Emission from the Intermediate-mass Black Hole in the Globular Cluster G1
James S. Ulvestad, Jenny E. Greene, Luis C. Ho
We have used the Very Large Array (VLA) to search for radio emission from the globular cluster G1 (Mayall-II) in M31. G1 has been reported by Gebhardt et al. to contain an intermed…
Nuclear Star Clusters (Nuclei) in Spiral Galaxies and Connection to Supermassive Black Holes
Roeland P. van der Marel, Joern Rossa, Carl Jakob Walcher +4
HST observations have revealed that compact sources exist at the centers of many, maybe even most, galaxies across the Hubble sequence. These sources are called "nuclei" or also "n…