Schrabback, Tim, Hartlap, Jan, Joachimi, Benjamin, Kilbinger, Martin, Simon, Patrick, Benabed, Karim, ...
We present a tomographic cosmological weak lensing analysis of the HST COSMOS Survey. Applying our lensing-optimized data reduction, principal component interpolation for the ACS PSF, and improved...
GAMA: towards a physical understanding of galaxy formation (2009)
Driver, Simon P., Norberg, Peder, Baldry, Ivan K., Bamford, Steven P., Hopkins, Andrew M., Liske, Jochen, ...
The Galaxy And Mass Assembly (GAMA) project is the latest in a tradition of large galaxy redshift surveys, and is now underway on the 3.9m Anglo-Australian Telescope at Siding Spring Observatory....
Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing (2009)
Bridle, Sarah, Balan, Sreekumar T., Bethge, Matthias, Gentile, Marc, Harmeling, Stefan, Heymans, Catherine, ...
We present the results of the GREAT08 Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by...
Kinematics at the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation (2009)
Howard, Christian D., Rich, R. Michael, Clarkson, Will, Mallery, Ryan, Kormendy, John, De Propris, Roberto, ...
We present new results from BRAVA, a large scale radial velocity survey of the Galactic bulge, using M giant stars selected from the Two Micron All Sky Survey catalogue as targets for the Cerro...
ASTRO-WISE An Astronomical Wide-Field Imaging System for Europe (2008)
Edwin A. Valentijn, Konrad Kuijken
www.astro-wise.org Abstract. With the new one square degree high resolution wide field imagers coming on-line in the near future, such as the 268 Mpix OmegaCAM at ESO’s VST and the 360 Mpix MegaCAM...
Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing (2008)
Bridle, Sarah, Shawe-Taylor, John, Amara, Adam, Applegate, Douglas, Balan, Sreekumar T., Berge, Joel, ...
The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant galaxies can be used...
Microlensing by cosmic strings (2008)
Kuijken, Konrad, Siemens, Xavier, Vachaspati, Tanmay
We consider the signature and detectability of gravitational microlensing of distant quasars by cosmic strings. Because of the simple image configuration such events will have a characteristic...
Extragalactic Planetary Nebula Kinematics with the WHT (2007)
Aaron J. Romanowsky, Nigel G. Douglas, Magda Arnaboldi, Konrad Kuijken
In spiral galaxies, the observability to large radii of cold gas disks has facilitated a general understanding of the distribution of mass in their outer parts. Elliptical galaxies, being gas poor,...
Microlensing by Cosmic Strings (2007)
Kuijken, Konrad, Siemens, Xavier, Vachaspati, Tanmay
We consider the signature and detectability of gravitational microlensing of distant quasars by cosmic strings. Because of the simple image configuration such events will have a characteristic light...
Astro-WISE: Chaining to the Universe (2007)
Valentijn, Edwin A., McFarland, John P., Snigula, Jan, Begeman, Kor G., Boxhoorn, Danny R., Rengelink, Roeland, ...
The recent explosion of recorded digital data and its processed derivatives threatens to overwhelm researchers when analysing their experimental data or when looking up data items in archives and...
Evidence of a Metal Rich Galactic Bar from the Vertex Deviation of the Velocity Ellipsoid (2006)
Soto, Mario, Rich, R. Michael, Kuijken, Konrad
We combine radial velocities, proper motions, and low resolution abundances for a sample of 315 K and M giants in the Baade's Window (l,b)=(0.9,-4) Galactic bulge field. The velocity ellipsoid of...
GaaP: PSF- and aperture-matched photometry using shapelets (2006)
We describe a new technique for measuring accurate galaxy colours from images taken under different seeing conditions. The method involves two ingredients. First we define the...
The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses (2006)
Massey, Richard, Heymans, Catherine, Berge, Joel, Bernstein, Gary, Bridle, Sarah, Clowe, Douglas, ...
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for the next generation of wide-field surveys. We...
The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations (2006)
Heymans, Catherine, Van Waerbeke, Ludovic, Bacon, David, Berge, Joel, Bernstein, Gary, Bertin, Emmanuel, ...
The Shear Testing Programme (STEP) is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In...
Accurate measurement of gravitational shear from images of distant galaxies is one of the most direct ways of studying the distribution of mass in the universe. We describe an implementation of a...
MACHOs in M31? Absence of evidence but not evidence of absence (2005)
Widrow, Lawrence M., Cseresnjes, Patrick, Kuijken, Konrad, Crotts, Arlin P. S., Bergier, Alexander, ...
We present results of a microlensing survey toward the Andromeda Galaxy (M31) carried out during four observing seasons at the Isaac Newton Telescope (INT). This survey is part of the larger...
HST Imaging of MEGA Microlensing Candidates in M31 (2005)
Cseresnjes, Patrick, Crotts, Arlin P. S., Bergier, Alex, Baltz, Edward A., Gyuk, Geza, ...
We investigate $HST$/ACS and WFPC2 images at the positions of five candidate microlensing events from a large survey of variability in M31 (MEGA). Three closely match unresolved sources, and two...
The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations (2005)
Heymans, Catherine, Van Waerbeke, Ludovic, Bacon, David, Berge, Joel, Bernstein, Gary, Bertin, Emmanuel, ...
The Shear TEsting Programme, STEP, is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In...
The deepest near-infrared view of the universe (2005)
Labbe, Ivo, Franx, Marijn, Rudnick, Gregory, Förster Schreiber, Natascha, Daddi, Emanuele, Van Dokkum, Peter, ...
The Luminosity-Size and Mass-Size Relations of Galaxies out to z similar to 3 (2004)
Trujillo, Ignacio, Rudnick, Gregory, Rix, Hans-Walter, Labbé, Ivo, Franx, Marijn, Daddi, Emanuele, ...
The luminosity-size and mass-size relations of galaxies out to z ~ 3 (2004)
Trujillo, Ignacio, Rudnick, Gregory, Rix, Hans-Walter, Labbé, Ivo, Franx, Marijn, Daddi, Emanuele, ...
The luminosity-size and mass-size distributions of galaxies out to z~3 are presented. We use very deep near-infrared images of the Hubble Deep Field-South in the Js, H, and Ks bands, taken as part of...
Stellar Kinematics of the Bulge from HST Proper Motion Measurements (2003)
I report on an ongoing programme of proper motion measurements in the Galactic Bulge, using HST images. As a first application, the data are used to derive the vertical gravitational acceleration on...
The Abundance of Low-luminosity Lyman alpha Emitters at High Redshift (2003)
Santos, Michael R., Ellis, Richard S., Kneib, Jean-Paul, Richard, Johan, Kuijken, Konrad
We derive the luminosity function of high-redshift Lyman alpha emitting sources from a deep, blind, spectroscopic survey that utilized strong-lensing magnification by intermediate-redshift clusters...
A Dearth of Dark Matter in Ordinary Elliptical Galaxies (2003)
Romanowsky, Aaron J., Douglas, Nigel D., Arnaboldi, Magda, Kuijken, Konrad, Merrifield, Michael R., Napolitano, Nicola R., ...
The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies have been studied using the Planetary Nebula Spectrograph. The galaxies' velocity dispersion profiles are found...
Model-independent measurements of bar pattern speeds (2003)
Gerssen, Joris, Kuijken, Konrad, Merrifield, Michael R.
The pattern speed in one of the fundamental parameters that determines the structure of barred galaxies. This quantity is usually derived from indirect methods or by employing model assumptions. The...
The Luminosity-Size and Mass-Size Relations of Galaxies out to z~3 (2003)
Trujillo, Ignacio, Rudnick, Gregory, Rix, Hans-Walter, Labbe, Ivo, Franx, Marijn, Daddi, Emanuele, ...
The luminosity-size and stellar mass-size distributions of galaxies out to z~3 is presented. We use very deep near-infrared images of the Hubble Deep Field South in the J_s, H, and K_s bands, taken...
The basic equations and geometry of gravitational lensing are described, as well as the most important contexts in which it is observed in astronomy: strong lensing, weak lensing and microlensing.
Labbé, Ivo, Frankx, Marijn, Rudnick, Gregory, Förster Schreiber, Natascha M., Rix, Hans-Walter, Moorwood, Alan, ...
Labbé, Ivo, Franx, Marijn, Rudnick, Gregory, Moorwood, Alan, Förster-Schreiber, Natascha, Rix, Hans-Walter, ...
Labbé, Ivo, Franx, Marijn, Rudnick, Gregory, Schreiber, Natascha M., Förster Schreiber, Natascha M., Rix, Hans-Walter, ...
We present deep near-infrared (NIR) Js-, H-, and Ks-band ISAAC imaging of the Wide Field Planetary Camera 2 (WFPC2) field of the Hubble Deep Field South (HDF-S). The 2.5 arcmin; times;2.5 arcmin;...
Large disklike galaxies at high redshift (2003)
Labbé, Ivo, Rudnick, Gregory, Franx, Marijn, Daddi, Emanuele, Van Dokkum, Pieter G., Förster Schreiber, Natascha M., ...
Using deep near-infrared imaging of the Hubble Deep Field-South with the Infrared Spectrometer and Array Camera on the Very Large Telescope, we find six large disklike galaxies at redshifts...
Labbe, Ivo, Franx, Marijn, Rudnick, Gregory, Moorwood, Alan F. M., Foerster Schreiber, Natascha, Rix, Hans-Walter, ...
Modern Techniques in Galaxy Kinematics: Results from Planetary Nebula Spectroscopy (2002)
Romanowsky, Aaron J., Douglas, Nigel G., Kuijken, Konrad, Arnaboldi, Magda, Gerssen, Joris, Merrifield, Michael R.
We have observed planetary nebulae (PNe) in several early-type galaxies using new techniques on 4- to 8-meter-class telescopes. We obtain the first large data sets (~ 100 velocities each) of PN...
Kuijken, Konrad, Rich, R. Michael
We report proper motion dispersions for stars in the direction of two fields of the Galactic bulge, using HST/WFPC2 images taken six years apart. Our two fields are Baade's Window (l,b)=(1.13,-3.77)...
The dynamics of S0 galaxies and their Tully-Fisher relation (2001)
Mathieu, Anne, Merrifield, Michael, Kuijken, Konrad
This paper investigates the detailed dynamical properties of a relatively homogeneous sample of disc-dominated S0 galaxies, with a view to understanding their formation, evolution and structure. By...
Hoekstra, Henk, Franx, Marijn, Kuijken, Konrad, Van Dokkum, Pieter G.
We have detected the weak lensing signal induced by the cluster of galaxies MS 2053-04 (z=0.58) from a two-colour mosaic of 6 HST WFPC2 images. The best fit singular isothermal sphere model to the...
Ellis, Richard, Santos, Mike, Kneib, Jean-Paul, Kuijken, Konrad
We discuss the physical nature of a remarkably faint pair of Lyman alpha-emitting images discovered close to the giant cD galaxy in the lensing cluster Abell 2218 (z=0.18) during a systematic survey...
Microlensing in M31; Preliminary lightcurves from MEGA (2001)
De Jong, Jelte, Sackett, Penny D., Kuijken, Konrad, Uglesich, Robert, Crotts, Arlin, Sutherland, Will
One of the possible astrophysical solutions to the galactic dark matter problem is the presence of a significant amount of ``dark'' compact objects (MACHOs) in galactic dark matter halos. MEGA...
Rudnick, Gregory, Franx, Marijn, Rix, Hans-Walter, Moorwood, Alan, Kuijken, Konrad, Van Starkenburg, Lottie, ...
We present the first results from the Faint Infra-Red Extragalactic Survey (FIRES) of the Hubble Deep Field South. Using a combination of deep near infrared data obtained with ISAAC at the VLT with...
Kuijken, Konrad, Garcia, Inigo
This review addresses recent developments in the field of disk galaxy warps. Both results from a new HI survey of edgeon disk galaxies, and of simulations of the interaction between a disk+halo and...
Search for High Proper Motion White Dwarfs (2000)
De Jong, Jelte, Kuijken, Konrad, Neeser, Mark
Recent results of microlensing surveys, show that 10-20% of the dark halo mass of the Milky Way consists of compact objects. The masses of these compact objects range from 0.1 to 1 solar mass. New...
Mass and mass-to-light ratio of galaxy groups from weak lensing (1999)
Hoekstra, Henk, Franx, Marijn, Kuijken, Konrad
We have measured for the first time the weak lensing signal due to groups of galaxies. The groups are at intermediate redshifts, and have been identified in the CNOC2 field survey, which was kindly...
Weak weak lensing: correcting weak shear measurements accurately for PSF anisotropy (1999)
We have developed a new technique for weak lensing analysis, with which the effect of the point spread function (PSF) on small galaxy images can be corrected for accurately. Rather than relying on...
Hidden Bars and Boxy Bulges (1999)
Merrifield, Michael R., Kuijken, Konrad
It has been suggested that the boxy and peanut-shaped bulges found in some edge-on galaxies are galactic bars viewed from the side. We investigate this hypothesis by presenting emission-line spectra...
The Kinematics of Galactic Stellar Disks (1998)
Merrifield, Michael R., Kuijken, Konrad
The disks of galaxies are primarily stellar systems, and fundamentally dynamical entities. Thus, to fully understand galactic disks, we must study their stellar kinematics as well as their...
The Maximum Optical Depth Towards Bulge Stars From Axisymmetric Models of the Milky Way (1997)
It has been known that recent microlensing results towards the bulge imply mass densities that are surprisingly high given dynamical constraints on the Milky Way mass distribution. We derive the...
Interactions Between Massive Dark Halos And Warped Disks (1996)
The normal mode theory for warping of galaxy disks, in which disks are assumed to be tilted with respect to the equator of a massive, flattened dark halo, assumes a rigid, fixed halo. However,...
A Search for Counter-Rotating Stars in S0 Galaxies (1996)
Kuijken, Konrad, Fisher, David, Merrifield, Michael R.
We have obtained high signal-to-noise spectra along the major axes of 28 S0 galaxies in order to search for the presence of disk stars on retrograde orbits. Full line-of-sight velocity distributions...
Observational Evidence for a Bar in the Milky Way (1995)
Evidence from a variety of sources points towards the existence of a bar in the central few kpc of the Galaxy. The measurements roughly agree on the direction of the bar major axis, but other...
Abelian Higgs Hair for Black Holes (1995)
Achucarro, Ana, Gregory, Ruth, Kuijken, Konrad
We find evidence for the existence of solutions of the Einstein and Abelian Higgs field equations describing a black hole pierced by a Nielsen-Olesen vortex. This situation falls outside the scope of...
Gravitational redshift in the NGC 4258 disk? (1995)
Smette, Alain, Kuijken, Konrad
The recent observations of high-velocity maser emissions in NGC 4258 by Myoshi et al provide strong evidence for a central object of mass 3.6 10**7 solar masses in the nucleus of this galaxy based on...
The pattern speed of the bar in NGC 936 (1995)
Merrifield, Michael R., Kuijken, Konrad
We have used the Tremaine-Weinberg method to measure the angular speed of rotation for the bar in the SB0 galaxy NGC 936. With this technique, the bar's pattern speed, Omega_p, can be derived from...
Nearly Self-Consistent Disk-Bulge-Halo Models for Galaxies (1995)
Kuijken, Konrad, Dubinski, John
We describe methods for setting up self-consistent disk-bulge-halo galaxy models. The bulge and halo distribution functions (\df) are functions of $E$ and $L_z$ only. The halo's flattening and...
ESTABLISHING THE CONNECTION BETWEEN PEANUT-SHAPED BULGES AND GALACTIC BARS (1995)
Kuijken, Konrad, Merrifield, Michael R.
It has been suggested that the peanut-shaped bulges seen in some edge-on disk galaxies are due to the presence of a central bar. Although bars cannot be detected photometrically in edge-on galaxies,...
The Settling of Warped Disks in Oblate Dark Halos (1994)
Dubinski, John, Kuijken, Konrad
When a galaxy forms, the disk may initially be tilted with respect to a flattened dark halo. The misalignment between the disk and the halo is a common explanation for galactic disk warps, since in...
An Axisymmetric Distribution Function for the Galactic Bulge (1994)
We describe a method for parameterizing two-integral distribution functions, based on triangular tesselations of the integral plane. We apply the method to the axisymmetric isotropic rotator model...
Lowered Evans Models: Analytic Distribution Functions of Oblate Halo Potentials (1993)
Kuijken, Konrad, Dubinski, John
We describe an analytic distribution function of a finite, oblate stellar system that is useful for the practical modelling of dark halos. The function is determined by lowering Evans's (1993)...