4.2k citations · 53.7k across the 547 of their papers we have counts for
12 papers · 2 filters
AGNs and Starbursts: What Is the Real Connection?
Luis C. Ho
It is now widely believed that the growth of massive black holes is closely linked to the formation of galaxies, but there have been few concrete constraints on the actual physical…
Is the Broad-Line Region Clumped or Smooth? Constraints from the H alpha Profile in NGC 4395, the Least Luminous Seyfert 1 Galaxy
Ari Laor, Aaron J. Barth, Luis C. Ho +1
The origin and configuration of the gas which emits broad lines in Type I active galactic nuclei is not established yet. The lack of small-scale structure in the broad emission-lin…
The Radio Quiescence of Active Galaxies with High Accretion Rates
Jenny E. Greene, Luis C. Ho, James S. Ulvestad
We present 6 cm Very Large Array observations of the Greene & Ho (2004) sample of 19 low-mass active galaxies with high accretion rates. This is one of the only studies of a unifor…
Probing the Coevolution of Supermassive Black Holes and Quasar Host Galaxies
Chien Y. Peng, Chris D. Impey, Luis C. Ho +2
At low redshift, there are fundamental correlations between the mass of supermassive black holes (MBH) and the mass (Mbulge) and luminosity of the host galaxy bulge. We investigate…
M82, Starbursts, Star Clusters, and the Formation of Globular Clusters
Eric Keto, Luis C. Ho, K. Y. Lo
We observed the nearby starburst galaxy M82 in CO in the higher frequency (2--1) transition to achieve an angular resolution below 1 arc second or 17 pc at the target. We resolved…
Mass distribution of spiral galaxies from characteristics of spiral structure: Constraints on galaxy formation models
Marc S. Seigar, Aaron J. Barth, James Bullock +1
Recently, it has been shown that a correlation exists between the rate of shear and the spiral arm pitch angle in disk galaxies. The rate of shear depends upon the shape of the rot…
An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations
Karl Gebhardt, R. Michael Rich, Luis C. Ho
We present dynamical models for the massive globular cluster G1. The goal is to measure or place a significant upper limit on the mass of any central black hole. Whether or not glo…
Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. I. A Reverberation-Based Measurement of the Black Hole Mass
Bradley M. Peterson, Misty C. Bentz, Louis-Benoit Desroches +8
A reverberation-mapping program on NGC 4395, the least-luminous known Seyfert 1 galaxy, undertaken with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, yiel…
Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b
J. S. Bloom, J. X. Prochaska, D. Pooley +25
The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB…
"Low-state" Black Hole Accretion in Nearby Galaxies
Luis C. Ho
I summarize the main observational properties of low-luminosity AGNs in nearby galaxies to argue that they are the high-mass analogs of black hole X-ray binaries in the "low/hard"…
The Afterglows of Ultraluminous Quasars
Jian-Min Wang, Ye-Fei Yuan, Luis C. Ho
Quasars represent a brief phase in the life-cycle of most massive galaxies, but the evolutionary connection between central black holes and their host galaxies remains unclear. Whi…
Extreme X-ray Behavior of the Low-Luminosity Active Nucleus in NGC 4395
Edward C. Moran, Michael Eracleous, Karen M. Leighly +4
We present the results of a 17 ks Chandra ACIS-S observation of the nearby dwarf spiral galaxy NGC 4395. Chandra affords the first high-quality, broadband X-ray detection of the ac…