4.2k citations · 53.7k across the 547 of their papers we have counts for
17 papers · 2 filters
An HST Census of Nuclear Star Clusters in Late-Type Spiral Galaxies: I. Observations and Image Analysis
Torsten Boeker, Seppo Laine, Roeland P. van der Marel +4
We present new HST I-band images of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties…
Extreme X-ray Behavior in the Low-Luminosity Active Nucleus of NGC 4395
E. C. Moran, M. Eracleous, K. M. Leighly +4
We present the results of a 17 ks Chandra observation of the nearby dwarf spiral galaxy NGC 4395, focusing on the X-ray properties of the moderate-mass black hole that resides in i…
Limits on the Mass of the Central Black Hole in 16 Nearby Bulges
Marc Sarzi, Hans-Walter Rix, Joseph C. Shields +6
We report upper limits on the masses of black holes that can be present in the centers of 16 nearby galaxy bulges. These limits for our statistically complete sample were derived f…
Measuring Black Hole Masses Using Ionized Gas Kinematics
Aaron J. Barth, Marc Sarzi, Luis C. Ho +5
We describe techniques for measuring the central masses of galaxies using emission-line kinematics observed with the Hubble Space Telescope. For accurate results, it is necessary t…
An Efficient Strategy to Select Targets for Gas-Dynamical Measurements of Black Hole Masses Using the Hubble Space Telescope
Luis C. Ho, Marc Sarzi, Hans-Walter Rix +4
Gas-dynamical studies using the Hubble Space Telescope are an integral component for future progress in the search for massive black holes in galactic nuclei. Here we present an ex…
Nuclear Cusps and Cores in Early-type Galaxies As Relics of Binary Black Hole Mergers
Swara Ravindranath, Luis C. Ho, Alexei V. Filippenko
We present an analysis of the central cusp slopes and core parameters of early-type galaxies using a large database of surface brightness profiles obtained from Hubble Space Telesc…
Nonstandard Central Engines in Nearby Galaxies
Luis C. Ho
We argue that nearby galaxy nuclei contain massive black holes that are fueled by low radiative efficiency accretion flows.
The Population of AGNs in Nearby Galaxies
Luis C. Ho
This contribution reviews the properties of nuclear activity in nearby galaxies, with emphasis on results obtained from current optical surveys and multiwavelength follow-up observ…
The Super Star Cluster NGC 1569-A Resolved on Sub-Parsec Scales with Hubble Space Telescope Spectroscopy
Dan Maoz, Luis C. Ho, Amiel Sternberg
We present 3000--10000 Ang HST/STIS long-slit spectroscopy of the bright super star cluster A (SSC-A) in the dwarf starburst galaxy NGC 1569. The 0.05" HST angular resolution allow…
Central Structural Parameters of Early-Type Galaxies as Viewed with HST/NICMOS
Swara Ravindranath, Luis C. Ho, Chien Y. Peng +2
We present surface photometry for the central regions of a sample of 33 early-type (E, S0, and S0/a) galaxies observed at 1.6 microns (H band) using the Hubble Space Telescope (HST…
Statistical Properties of Radio Emission from the Palomar Seyfert Galaxies
James S. Ulvestad, Luis C. Ho
We have carried out an analysis of the radio and optical properties of a statistical sample of 45 Seyfert galaxies from the Palomar spectroscopic survey of nearby galaxies. We find…
The Soft X-ray Properties of Nearby Low-Luminosity Active Galactic Nuclei and their Contribution to the Cosmic X-ray Background
Eve L. Halderson, Edward C. Moran, Alexei V. Filippenko +1
We have examined ROSAT soft X-ray observations of a complete, distance-limited sample of Seyfert and LINER galaxies. X-ray data are available for 46 out of 60 such objects which li…
The Inner Light Year of the Nearest Seyfert 1 Nucleus in NGC 4395
J. M. Wrobel, C. D. Fassnacht, L. C. Ho
The NRAO VLBA was used at 1.4 GHz to image the inner 550 mas (23 lt-years) of the nearest known Seyfert 1 nucleus, in the Sm galaxy NGC 4395. One continuum source was detected, wit…
An Ultraviolet through Infrared Look at Star Formation and Super Star Clusters in Two Circumnuclear Starburst Rings
Dan Maoz, Aaron J. Barth, Luis C. Ho +2
We present broad-band (U, V, I,and H) and narrow-band(H-alpha+[N II] and Paschen-alpha) images of the circumnuclear starburst rings in two nearby spiral galaxies, NGC 1512 and NGC…
Radio Continuum Survey of an Optically-Selected Sample of Nearby Seyfert Galaxies
Luis C. Ho, James S. Ulvestad
We have used the Very Large Array (VLA) to conduct a survey for radio continuum emission in the sample of 52 Seyfert nuclei selected from the optical spectroscopic galaxy catalog o…
The Central Regions of Early-Type Galaxies Hosting Active Galactic Nuclei as Viewed with HST/NICMOS
Swara Ravindranath, Luis C. Ho, Chien Y. Peng +2
We present preliminary results from surface photometry of a sample of early-type galaxies observed with NICMOS on board HST in the F160W (H-band) filter. Dust is found to occur mos…
Nuclear Luminosities and Radio Loudness of Seyfert Nuclei
Luis C. Ho, Chien Y. Peng
Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei (AGNs). We question this widely held assumption by showing that the distribution of the r…