Search Publications
The Supernova Legacy Survey: measurement of ΩM, ΩΛ and w from the first year data set
Sullivan, M.; Lidman, C.; Aldering, G. +39 more
We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of the 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degr…
A Direct Empirical Proof of the Existence of Dark Matter
Bradač, Maruša; Jones, Christine; Gonzalez, Anthony H. +4 more
We present new weak-lensing observations of 1E 0657-558 (z=0.296), a unique cluster merger, that enable a direct detection of dark matter, independent of assumptions regarding the nature of the gravitational force law. Due to the collision of two clusters, the dissipationless stellar component and the fluid-like X-ray-emitting plasma are spatially…
Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
Peterson, Bradley M.; Vestergaard, Marianne
We present four improved empirical relationships useful for estimating the central black hole mass in nearby AGNs and distant luminous quasars alike using either optical or UV single-epoch spectroscopy. These mass scaling relationships between line widths and luminosity are based on recently improved empirical relationships between the broad-line …
The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the Fundamental Plane of elliptical and lenticular galaxies
Krajnović, Davor; Emsellem, Eric; van de Ven, Glenn +12 more
We investigate the well-known correlations between the dynamical mass-to-light ratio (M/L) and other global observables of elliptical (E) and lenticular (S0) galaxies. We construct two-integral Jeans and three-integral Schwarzschild dynamical models for a sample of 25 E/S0 galaxies with SAURON integral-field stellar kinematics to about one effecti…
Long γ-ray bursts and core-collapse supernovae have different environments
Pian, E.; Ferguson, H. C.; Gull, T. R. +30 more
When massive stars exhaust their fuel, they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse also powers an even more brilliant relativistic explosion known as a long-duration γ-ray burst. One would then expect that these long γ-ray bursts and core-collapse super…
The SAURON project - V. Integral-field emission-line kinematics of 48 elliptical and lenticular galaxies
Bacon, Roland; Krajnović, Davor; Emsellem, Eric +10 more
We present the emission-line fluxes and kinematics of 48 representative elliptical and lenticular galaxies obtained with our custom-built integral-field spectrograph, SAURON, operating on the William Herschel Telescope. Hβ, [OIII]λλ4959,5007 and [NI]λλ5198,5200 emission lines were measured using a new procedure that simultaneously fits both the st…
The Hubble Ultra Deep Field
Ferguson, Henry C.; Koekemoer, Anton M.; Lucas, Ray A. +12 more
This paper presents the Hubble Ultra Deep Field (HUDF), a 1 million s exposure of an 11 arcmin2 region in the southern sky with the Advanced Camera for Surveys on the Hubble Space Telescope using Director's Discretionary Time. The exposure time was divided among four filters, F435W (B435), F606W (V606), F775W (i
The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +8 more
We present a detailed analysis of the morphology, isophotal parameters, and surface brightness profiles for 100 early-type members of the Virgo Cluster, from dwarfs (MB=-15.1 mag) to giants (MB=-21.8 mag), imaged in the g and z passbands using the Advanced Camera for Surveys on board the Hubble Space Telescope. Dust and compl…
The Sloan Lens ACS Survey. III. The Structure and Formation of Early-Type Galaxies and Their Evolution since z ~ 1
Treu, Tommaso; Koopmans, Léon V. E.; Bolton, Adam S. +2 more
We present a joint gravitational lensing and stellar-dynamical analysis of 15 massive field early-type galaxies selected from the Sloan Lens ACS (SLACS) Survey. The following numerical results are found: (1) A joint likelihood gives an average logarithmic density slope for the total mass density of <γ'>=2.01+0.02-0…
The ACS Virgo Cluster Survey. VIII. The Nuclei of Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +9 more
The ACS Virgo Cluster Survey is a Hubble Space Telescope program to obtain high-resolution imaging in widely separated bandpasses (F475W~g and F850LP~z) for 100 early-type members of the Virgo Cluster, spanning a range of ~460 in blue luminosity. We use this large, homogenous data set to examine the innermost structure of these galaxies and to cha…