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- Centre National de la Recherche ScientifiqueFR348 papers
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18 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…
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…
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…
Discovery of Ghost Cavities in Abell 2597's X-ray Atmosphere
B. R. McNamara, M. W. Wise, P. E. J. Nulsen +10
A Chandra image of the central 100 kpc of the Abell 2597 cluster of galaxies shows bright, irregular, X-ray emission within the central dominant cluster galaxy (CDG), and two low s…
Interaction of Radio Lobes with the Hot Intracluster Medium: Driving Convective Outflow in Hydra A
P. E. J. Nulsen, L. P. David, B. R. McNamara +3
The radio lobes of Hydra A lie within cavities surrounded by a rim of enhanced X-ray emission in the intracluster gas. Although the bright rim appears cooler than the surrounding g…