Search Publications
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…
Spitzer MIPS Infrared Imaging of M31: Further Evidence for a Spiral-Ring Composite Structure
Barmby, P.; Krause, O.; Gordon, K. D. +16 more
New images of M31 at 24, 70, and 160 µm taken with the Multiband Imaging Photometer for Spitzer (MIPS) reveal the morphology of the dust in this galaxy. This morphology is well represented by a composite of two logarithmic spiral arms and a circular ring (radius ~10 kpc) of star formation offset from the nucleus. The two spiral arms appear t…
The XMM Cluster Survey: A Massive Galaxy Cluster at z = 1.45
Conselice, Christopher J.; Hilton, Matt; Stanford, S. A. +14 more
We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z=1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical spectroscopy shows that six galaxies within a ~60" diameter region lie at z=1.45+/-0.01. Model fits to the X-ray spec…
The Detailed Star Formation History in the Spheroid, Outer Disk, and Tidal Stream of the Andromeda Galaxy
Ferguson, Henry C.; Brown, Thomas M.; Rich, R. Michael +5 more
Using HST ACS, we have obtained deep optical images reaching stars well below the oldest main-sequence turnoff in the spheroid, tidal stream, and outer disk of Andromeda. We have reconstructed the star formation history in these fields by comparing their color-magnitude diagrams to a grid of isochrones calibrated to Galactic globular clusters obse…