Search Publications
Chandra and XMM-Newton Observations of a Sample of Low-Redshift FR I and FR II Radio Galaxy Nuclei
Hardcastle, M. J.; Birkinshaw, M.; Worrall, D. M. +2 more
We present spectral results from Chandra and XMM-Newton observations of a sample of 22 low-redshift (z<0.1) radio galaxies and consider whether the core emission originates from the base of a relativistic jet, or an accretion flow, or contains contributions from both. We find correlations between the unabsorbed X-ray, radio, and optical fluxes …
Hubble Space Telescope and Ground-based Observations of Type Ia Supernovae at Redshift 0.5: Cosmological Implications
Filippenko, Alexei V.; Garnavich, Peter; Riess, Adam G. +26 more
We present observations of the Type Ia supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshift z~0.5. They were discovered in early 1999 with the 4.0 m Blanco telescope at Cerro Tololo Inter-American Observatory by the High-z Supernova Search Team (HZT) and subsequently followed with many ground-based telescopes. SNe 1999Q and 1999U we…
Early and Rapid Merging as a Formation Mechanism of Massive Galaxies: Empirical Constraints
Conselice, Christopher J.
We present the results of a series of empirical computations regarding the role of major mergers in forming the stellar masses of modern galaxies based on measured galaxy merger and star formation histories from z~0.5 to 3. We reconstruct the merger history of normal field galaxies from z~3 to z~0 as a function of initial mass using published pair…
The Nitrogen Chemistry of Titan's Upper Atmosphere Revealed
Yelle, R. V.; Vuitton, V.; Anicich, V. G.
Titan's atmosphere is unique because dissociation of N2 and CH4, the primary atmospheric constituents, provides the H, C, and N atoms necessary for the synthesis of complex organic molecules. The first steps in the synthesis of organic molecules occur in the upper atmosphere where energetic photons and electrons dissociate N<…
A Survey of Galaxy Kinematics to z~1 in the TKRS/GOODS-N Field. I. Rotation and Dispersion Properties
Weiner, Benjamin J.; Faber, S. M.; Willmer, Christopher N. A. +7 more
We present kinematic measurements of a large sample of galaxies from the Team Keck Redshift Survey in the GOODS-N field. We measure line-of-sight velocity dispersions from integrated emission for 1089 galaxies with median redshift 0.637 and spatially resolved kinematics for a subsample of 380 galaxies. This is the largest sample of galaxies to z~1…
Cosmic Evolution of Black Holes and Spheroids. I. The MBH-σ Relation at z = 0.36
Treu, Tommaso; Malkan, Matthew A.; Blandford, Roger D. +1 more
We test the evolution of the correlation between black hole mass and bulge velocity dispersion (MBH-σ), using a carefully selected sample of 14 Seyfert 1 galaxies at z=0.36+/-0.01. We measure velocity dispersion from stellar absorption lines around Mg b (5175 Å) and Fe (5270 Å) using high-S/N Keck spectra and estimate black hole mass fr…
The Large-Scale and Small-Scale Clustering of Lyman Break Galaxies at 3.5<=z<=5.5 from the GOODS Survey
Ouchi, Masami; Dickinson, Mark; Ferguson, Henry C. +4 more
We report on the angular correlation function of Lyman break galaxies (LBGs) at z~4 and 5 from deep samples obtained from the Great Observatories Deep Origins Survey (GOODS). As for LBGs at z~3, the shape of w(θ) of the GOODS LBGs is well approximated by a power law with a slope β~0.6 at angular separation θ>=10". The clustering strength of the…
The Rest-Frame Far-Ultraviolet Morphologies of Star-forming Galaxies at z ~ 1.5 and 4
Ferguson, Henry C.; Giavalisco, Mauro; Lotz, Jennifer M. +2 more
We apply a new approach to quantifying galaxy morphology and identifying galaxy mergers to the rest-frame far-ultraviolet images of 82 z~4 Lyman break galaxies (LBGs) and 55 1.2<z<1.8 emission-line galaxies in the GOODS and Ultra Deep Field survey. We compare the distributions of the Gini coefficient (G), the second-order moment of the brigh…
From Supermassive Black Holes to Dwarf Elliptical Nuclei: A Mass Continuum
Harris, William E.; Wehner, Elizabeth H.
Considerable evidence suggests that supermassive black holes reside at the centers of massive galactic bulges. At a lower galactic mass range, many dwarf galaxies contain extremely compact nuclei that structurally resemble massive globular clusters. We show that both these types of central massive objects (CMOs) define a single unbroken relation b…
Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems
Henry, Todd J.; Mason, Brian D.; Jao, Wei-Chun +4 more
We present results of a reconnaissance for stellar companions to all 131 radial velocity-detected candidate extrasolar planetary systems known as of 2005 July 1. Common proper-motion companions were investigated using the multiepoch STScI Digitized Sky Surveys and confirmed by matching the trigonometric parallax distances of the primaries to compa…