The initial mass function of early-type galaxies (2009)
Treu, T., Auger, M. W., Koopmans, L. V. E., Gavazzi, R., Marshall, P. J., Bolton, A. S.
We determine an absolute calibration of the initial mass function (IMF) of early-type galaxies, by studying a sample of 56 gravitational lenses identified by the SLACS Survey. Under the assumption of...
The Sloan Lens ACS Survey. IX. Colors, Lensing and Stellar Masses of Early-type Galaxies (2009)
Auger, M. W., Treu, T., Bolton, A. S., Gavazzi, R., Koopmans, L. V. E., Marshall, P. J., ...
We present the current photometric dataset for the Sloan Lens ACS (SLACS) Survey, including HST photometry from ACS, WFPC2, and NICMOS. These data have enabled the confirmation of an additional 15...
Suyu, S. H., Marshall, P. J., Auger, M. W., Hilbert, S., Blandford, R. D., Koopmans, L. V. E., ...
Strong gravitational lens systems with measured time delays between the multiple images provide a method for measuring the ``time-delay distance'' to the lens, and thus the Hubble constant. We...
Bradač, M., Treu, T., Applegate, D., Gonzalez, A. H., Clowe, D., Forman, W., ...
The gravitational potential of clusters of galaxies acts as a cosmic telescope allowing us to find and study galaxies at fainter limits than otherwise possible and thus probe closer to the epoch of...
Can dry merging explain the size evolution of early-type galaxies? (2009)
Nipoti, C., Treu, T., Auger, M. W., Bolton, A. S.
The characteristic size of early-type galaxies (ETGs) of given stellar mass is observed to increase significantly with cosmic time, from redshift z>2 to the present. A popular explanation for this...
McKean, J. P., Auger, M. W., Koopmans, L. V. E., Vegetti, S., Czoske, O., Fassnacht, C. D., ...
The gravitational lens system CLASS B2108+213 has two radio-loud lensed images separated by 4.56 arcsec. The relatively large image separation implies that the lensing is caused by a group of...
Detection of a Dark Substructure through Gravitational Imaging (2009)
Vegetti, S., Koopmans, L. V. E., Bolton, A., Treu, T., Gavazzi, R.
We report the detection of a dark substructure through direct gravitational imaging - undetected in the HST-ACS F814W image - in the gravitational lens galaxy of SLACS SDSSJ0946+1006 (the "Double...
The Distribution of Dark Matter Over 3 Decades in Radius in the Lensing Cluster Abell 611 (2009)
Newman, A. B., Treu, T., Ellis, R. S., Sand, D. J., Richard, J., Marshall, P. J., ...
We present a detailed analysis of the baryonic and dark matter distribution in the lensing cluster Abell 611 (z=0.288), with the goal of determining the dark matter profile over an unprecedented...
The Quasar SDSS J105041.35+345631.3: Black Hole Recoil or Extreme Double-Peaked Emitter? (2009)
Shields, G. A., Rosario, D. J., Smith, K. L., Bonning, E. W., Salviander, S., Kalirai, J. S., ...
The quasar SDSS J105041.35+345631.3 (z = 0.272) has broad emission lines blueshifted by 3500 km/s relative to the narrow lines and the host galaxy. Such an object may be a candidate for a recoiling...
Koopmans, L. V. E., Bolton, A., Treu, T., Czoske, O., Auger, M. W., Barnabe, M., ...
Based on 58 SLACS strong-lens early-type galaxies with direct total-mass and stellar-velocity dispersion measurements, we find that inside one effective radius massive elliptical galaxies with M_eff...
TU, H., Gavazzi, R., Limousin, M., Cabanac, R., Marshall, P. J., Fort, B., ...
SL2SJ02176-0513 is a remarkable lens for the presence of two multiply-imaged systems at different redshifts lensed by a foreground massive galaxy at $z_{\rm lens}=0.656$: a bright cusp arc at $z_{\rm...
Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction (2009)
Suyu, S. H., Marshall, P. J., Blandford, R. D., Fassnacht, C. D., Koopmans, L. V. E., McKean, J. P., ...
Strong gravitational lensing is a powerful technique for probing galaxy mass distributions and for measuring cosmological parameters. Lens systems with extended source-intensity distributions are...
Stars and dark matter in the spiral gravitational lens 2237+0305 (2008)
Trott, C. M., Treu, T., Koopmans, L. V. E., Webster, R. L.
We construct a mass model for the spiral lens galaxy 2237+0305, at redshift z_l=0.04, based on gravitational-lensing constraints, HI rotation, and new stellar-kinematic information, based on data...
Treu, T., Gavazzi, R., Gorecki, A., Marshall, P. J., Koopmans, L. V. E., Bolton, A. S., ...
We study the relation between the internal structure of early-type galaxies and their environment using 70 strong gravitational lenses from the Sloan ACS Lens Survey. The Sloan database is used to...
Nipoti, C., Treu, T., Bolton, A. S.
Massive early-type galaxies are observed to lie on the Mass Plane (MP), a two-dimensional manifold in the space of effective radius R_e, projected mass M_p (measured via strong gravitational lensing)...
Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction (2008)
Suyu, S. H., Marshall, P. J., Blandford, R. D., Fassnacht, C. D., Koopmans, L. V. E., McKean, J. P., ...
Strong gravitational lensing is a powerful technique for probing galaxy mass distributions and for measuring cosmological parameters. We present a pixelated approach to modeling simultaneously the...
Treu, T., Malkan, M. A., Blandford, R.
We measure the evolution of the correlation between black hole mass and host spheroid velocity dispersion over the last 6 billion years, by studying three carefully selected samples of active...
We present measurements of the Fundamental Plane (FP) parameters (the e#ective radius, the mean e#ective surface brightness, and the central velocity dispersion) of six field elliptical galaxies at...
Galaxy in the Test Image of the Hubble Deep Field South (2007)
T. Treu, M. Stiavelli, S. A. Baum, G. Bernstein, B. S. Blacker, C. M. Carollo
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Sand, D. J., Treu, T., Ellis, R. S., Smith, G. P., Kneib, J-P
(abridged) We utilize existing imaging and spectroscopic data for the galaxy clusters MS2137-23 and Abell 383 to present improved measures of the distribution of dark and baryonic material in the...
Marshall, P. J., Treu, T., Melbourne, J., Gavazzi, R., Bundy, K., Ammons, S. M., ...
We combine high-resolution images in four optical/infra-red bands, obtained with the laser guide star adaptive optics system on the Keck Telescope and with the Hubble Space Telescope, to study the...
Bundy, K., Treu, T., Ellis, R. S.
We examine the properties of a morphologically-selected sample of 0.4
Variability of Moderate Luminosity Active Galactic Nuclei at z=0.36 (2007)
Treu, T., Malkan, M. A., Ferry, M. A., Misch, T.
We monitored 13 moderate luminosity active galactic nuclei at z=0.36 to measure flux variability, explore feasibility of reverberation mapping, and determine uncertainties on estimating black hole...
Rodighiero, G., Gruppioni, C., Civano, F., Comastri, A., Franceschini, A., Mignoli, M., ...
We exploit very deep mid-IR (MIR) and X-ray observations by Spitzer and Chandra in the GOODS North to identify signs of hidden (either starburst or AGN) activity in spheroidal galaxies between z~0.3...
A panoramic mid-infrared survey of two distant clusters (2006)
Geach, J. E., Smail, Ian, Ellis, R. S., Moran, S. M., Smith, G. P., Treu, T., ...
We present panoramic Spitzer MIPS 24 μm observations, covering ~9 × 9 Mpc^2 (25' × 25') fields around two massive clusters, Cl 0024+16 and MS 0451-03, at z = 0.39 and z = 0.55, respectively,...
A Panoramic Mid-infrared Survey of Two Distant Clusters (2006)
Geach, J. E., Smail, Ian, Ellis, R. S., Moran, S. M., Smith, G. P., Treu, T., ...
(abridged) We present panoramic Spitzer MIPS 24um observations covering 9x9Mpc (25'x25') fields around two massive clusters, Cl0024+16 and MS0451-03, at z=0.39 and z=0.55. Our observations cover a...
A Panoramic Mid-infrared Survey of Two Distant Clusters (2006)
Geach, J. E., Smail, Ian, Ellis, R. S., Moran, S. M., Smith, G. P., Treu, T., ...
(abridged) We present panoramic Spitzer MIPS 24um observations covering 9x9Mpc (25'x25') fields around two massive clusters, Cl0024+16 and MS0451-03, at z=0.39 and z=0.55. Our observations cover a...
Fassnacht, C. D., McKean, J. P., Koopmans, L. V. E., Treu, T., Blandford, R. D., Auger, M. W., ...
We report the serendipitous discovery of two strong gravitational lens candidates (ACS J160919+6532 and ACS J160910+6532) in deep images obtained with the Advanced Camera for Surveys on the Hubble...
Stern, D., Van Dokkum, P. G., Nugent, P., Sand, D. J., Bloom, J. S., Ellis, R. S., ...
We report the discovery of a transient source in the central regions of galaxy cluster Abell 267.
Koopmans, L. V. E., Treu, T., Bolton, A. S., Burles, S., Moustakas, L. A.
(Abridged) We present a joint gravitational lensing and stellar dynamical analysis of fifteen massive field early-type galaxies, selected from the Sloan Lens (SLACS) Survey. The following numerical...
A Panoramic Mid-infrared Survey of Two Distant Clusters (2006)
Geach, J. E., Smail, Ian, Ellis, R. S., Moran, S. M., Smith, G. P., Treu, T., ...
(abridged) We present panoramic Spitzer MIPS 24um observations covering 9x9Mpc (25'x25') fields around two massive clusters, Cl0024+16 and MS0451-03, at z=0.39 and z=0.55. Our observations cover a...
A Panoramic Mid-infrared Survey of Two Distant Clusters (2006)
Geach, J. E., Smail, Ian, Ellis, R. S., Moran, S. M., Smith, G. P., Treu, T., ...
(abridged) We present panoramic Spitzer MIPS 24um observations covering 9x9Mpc (25'x25') fields around two massive clusters, Cl0024+16 and MS0451-03, at z=0.39 and z=0.55. Our observations cover a...
Treu, T., Ellis, R. S., Liao, T. X., Van Dokkum, P. G., Tozzi, P., Coil, A., ...
We present a comprehensive catalog of high signal-to-noise spectra obtained with the DEIMOS spectrograph on the Keck II telescope for a sample of F850LP
Sand, D. J., Treu, T., Ellis, R. S., Smith, G. P.
We present the results of a systematic search for gravitationally-lensed arcs in clusters of galaxies located in the Hubble Space Telescope Wide Field and Planetary Camera 2 data archive. By...
Keck Spectroscopy of distant GOODS Spheroidal Galaxies: Downsizing in a Hierarchical Universe (2005)
Treu, T., Ellis, R. S., Liao, T. X., Van Dokkum, P. G.
We analyze the evolution of the Fundamental Plane for 141 field spheroidal galaxies in the redshift range 0.2
CLASS B2108+213: A new wide separation gravitational lens system (2004)
McKean, J. P., Browne, I. W. A., Jackson, N. J., Koopmans, L. V. E., Norbury, M. A., Treu, T., ...
We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz...
Wide field imaging of distant clusters (2004)
Wide field imaging is key to understanding the build-up of distant clusters and their galaxy population. By focusing on the so far unexplored outskirts of clusters, where infalling galaxies first hit...
A unique small-scale gravitational arc in A1201. (2003)
Edge, A. C., Smith, G. P., Sand, D. J., Treu, T., Ebeling, H., Allen, S. W., ...
We present a snapshot Hubble Space Telescope (HST) image of the galaxy cluster A1201 (z=0.169), revealing a tangential arc 2 from the brightest cluster galaxy (BCG). Keck Echelle Spectrograph and...
Nipoti, C., Stiavelli, M., Ciotti, L., Treu, T., Rosati, P.
The X-ray cluster C0337-2522 at redshift $z=0.59$ hosts in its core a group of five elliptical galaxies. Using N-body simulations we show that a multiple merging event among the five galaxies is...
The dark matter halos of spheroidal galaxies and clusters of galaxies (2003)
Treu, T., Koopmans, L. V. E., Sand, D. J., Smith, G. P., Ellis, R. S.
We describe the first results from two observational projects aimed at measuring the amount and spatial distribution of dark matter in distant early-type galaxies (E/S0s) and clusters of galaxies. At...
The Dark Matter Distribution in the Central Regions of Galaxy Clusters (2003)
Sand, D. J., Treu, T., Smith, G. P., Ellis, R. S.
Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters...
The Dark Matter Distribution in the Central Regions of Galaxy Clusters (2003)
Sand, Dj, Treu, T., Gp, Smith, Ellis, Rs
Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters...
The Dark Matter Distribution in the Central Regions of Galaxy Clusters (2003)
Sand, Dj, Treu, T., Gp, Smith, Ellis, Rs
Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters...
The Lenses Structure & Dynamics (LSD) Survey aims at studying the internal structure of luminous and dark matter - as well as their evolution - of field early-type (E/SO) galaxies to z~1. In...
The Formation of Early-Type Galaxies: Observations to z=1 (2003)
How does the number density of early-type galaxies (E+S0) evolve with redshift? What are their star formation histories? Do their mass density profile and other structural properties evolve with...
The Hubble Constant from the Gravitational Lens B1608+656 (2003)
Koopmans, L. V. E., Treu, T., Fassnacht, C. D., Blandford, R. D., Surpi, G.
We present a refined gravitational lens model of the four-image lens system B1608+656 based on new and improved observational constraints: (i) the three independent time-delays and flux-ratios from...
Galactic cannibalism in the galaxy cluster C0337-2522 at z=0.59 (2003)
Nipoti, C., Stiavelli, M., Ciotti, L., Treu, T., Rosati, P.
According to the galactic cannibalism model, cD galaxies are formed in the center of galaxy clusters by merging of massive galaxies and accretion of smaller stellar systems: however, observational...
Redshift of the Einstein Ring in MG1549+305 (2003)
A deep spectrum taken with the Echelle Spectrograph and Imager (ESI) at the Keck II Telescope as part of the Lenses Structure and Dynamics (LSD) Survey reveals the redshifts of the extremely red...
Treu, T., Ellis, R. S., Dressler, A., Smail, I., Czoske, O., ...
We describe a new wide field Hubble Space Telescope survey of the galaxy cluster Cl0024+16 (z~0.4) consisting of a sparse-sampled mosaic of 39 Wide Field and Planetary Camera 2 images which extends...
The Dark Matter Distribution in the Central Regions of Galaxy Clusters (2003)
Sand, Dj, Treu, T., Gp, Smith, Ellis, Rs
Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters...
The Dark Matter Distribution in the Central Regions of Galaxy Clusters (2003)
Sand, Dj, Treu, T., Gp, Smith, Ellis, Rs
Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters...
Probing dark matter distribution with gravitational lensing and stellar dynamics (2002)
The Lenses Structure and Dynamics (LSD) Survey aims at measuring the luminous and dark matter distribution of high redshift early-type galaxies by combining gravitational lens analysis with newly...
We have measured the kinematic profile of the early-type (E/S0) lens galaxy in the system 0047-281 (z=0.485) with the {\sl Echelle Spectrograph and Imager} (ESI) on the W.M. Keck--II Telescope, as...
Measuring the mass of high-z galaxies with NGST (2002)
We discuss dynamical mass measurements of high-z galaxies with the Next Generation Space Telescope (NGST). In particular, we review some of the observational limits with the current...
The stellar velocity dispersion of the lens galaxy in MG2016+112 at z=1.004 (2002)
We present a direct measurement of the stellar velocity dispersion of the early-type lens galaxy D in the system MG2016+112 (z=1.004), determined from a spectrum obtained with the Echelle...
A wide field survey of the distant rich cluster CL0024+1654 (2001)
Treu, T., Ellis, R., Trivedi, P., Dressler, A., Oemler, G., ...
We describe the first results from a comprehensive study of the distant cluster Cl0024+1654 (z=0.39) based upon a pattern of 38 mosaiced HST-WFPC2 images extending to radii ~5Mpc. These are being...
The evolution of field early-type galaxies to z~0.7 (2001)
Treu, T., Stiavelli, M., Casertano, S., Møller, P., Bertin, G.
We have measured the Fundamental Plane (FP) parameters for a sample of 30 field early-type galaxies (E/S0) in the redshift range 0.1
Treu, T., Stiavelli, M., Bertin, G., Casertano, S., Møller, P.
We report on the study of a sample of 25 field early-type galaxies, in the redshift range z~0.1-0.5, selected on the basis of colours and morphology from the HST-MDS. Field early-type galaxies define...
Lyman alpha emitters with red colors at z~=2.4 (2001)
Stiavelli, M., Scarlata, C., Panagia, N., Treu, T., Bertin, G., Bertola, F.
We have carried out a search for Lyman alpha emission from galaxies at z~=2.4 over a field of 1200 sq. arcmin using the CFH12K camera at the CFHT and a custom medium band filter. The search has...
Treu, T., Stiavelli, M., Møller, P., Casertano, S., Bertin, G.
A sample of field early-type galaxies (E/S0) at intermediate redshift ($z\sim0.1-0.6$) is selected, based on morphology and colours from HST-WFPC2 parallel images. Photometric structural parameters...
The Morphology of Extremely Red Objects (2000)
We briefly discuss our survey of Extremely Red Objects (EROs) with HST/NICMOS and deep ground-based images and summarize its results. We use the high-resolution NICMOS images to sub-divide EROs into...
The Fundamental Plane of field early-type galaxies at intermediate redshift (2000)
Treu, T., Stiavelli, M., Casertano, S., Moller, P., Bertin, G.
We present preliminary results on the evolution of the stellar populations of field early-type galaxies (E/S0) from z=0.4 to z=0. The diagnostic tool used in this study is the Fundamental Plane (FP),...
Treu, T., Stiavelli, M., Casertano, S., Møller, P., Bertin, G.
We present measurements of the Fundamental Plane (FP) parameters (the effective radius, the mean effective surface brightness, and the central velocity dispersion) of six field elliptical galaxies at...
Stiavelli, M., Treu, T., Carollo, C. M., Rosati, P., Viezzer, R., Casertano, S., ...
The combined use of the ESO Very Large Telescope (VLT) UT1 Science Verification (SV) images and of the Hubble Space Telescope (HST) Hubble Deep Field South observations allows us to strengthen the...
An Extremely Red r^{1/4} Galaxy in the Test Image of the Hubble Deep Field South (1998)
Treu, T., Stiavelli, M., Walker, A. R., Williams, R. E., Baum, S. A., Bernstein, G., ...
We report the serendipitous discovery of an extremely red object in the Hubble Deep Field South (HDFS) Test NICMOS (Near Infrared Camera and Multi Object Spectrograph) field of view. The object is...
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