355 citations · 7k across the 87 of their papers we have counts for
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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…
The Metallicity of the Redshift 4.16 Quasar BR2248-1242
Craig Warner, Fred Hamann, Joseph C. Shields +3
We estimate the metallicity in the broad emission-line region of the redshift z=4.16 quasar, BR2248-1242, by comparing line ratios involving nitrogen to theoretical predictions. BR…
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…
Emission-Line Properties of z > 4 Quasars
Anca Constantin, Joseph C. Shields, Fred Hamann +2
We present results of a program of high signal-to-noise spectroscopy for 44 QSOs at redshifts > 4 using the MMT and Keck observatories. The quasar spectra cover 1100 -- 1700 A in t…