Scientific Commons: Tom Broadhurst

Auto b Redshift Survey: II { The Evolution of the Galaxy Luminosity Function by Spectral Type (2009)

Jeremy Heyl, Matthew Colless, Richard S. Ellis, Tom Broadhurst

We determine the evolution of the galaxy luminosity function (LF) as a function of spectral type using the Auto b redshift survey, a compendium of over 1700 galaxy redshifts in various...

Dynamical Study of A1689 from Wide-Field VLT/VIMOS Spectroscopy: Mass Profile, Concentration Parameter, and Velocity Anisotropy (2009)

Lemze, Doron, Broadhurst, Tom, Rephaeli, Yoel, Barkana, Rennan, Umetsu, Keiichi

We examine the dynamics structure of the rich cluster A1689, combining VLT/VIMOS spectroscopy with Subaru/Suprime-Cam imaging. The radial velocity distribution of ~500 cluster members is bounded by a...

The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations (2009)

Umetsu, Keiichi, Medezinski, Elinor, Broadhurst, Tom, Zitrin, Adi, Okabe, Nobuhiro, Hsieh, Bau-Ching, ...

We derive an accurate mass distribution of the rich galaxy cluster Cl0024+1654 (z=0.395) based on deep Subaru BR_{c}z' imaging and our recent comprehensive strong lensing analysis of HST/ACS/NIC3...

The Largest Gravitational Lens: MACS J0717.5+3745 (z=0.546) (2009)

Zitrin, Adi, Broadhurst, Tom, Rephaeli, Yoel, Sadeh, Sharon

We identify 13 sets of multiply-lensed galaxies around MACS J0717.5+3745 ($z=0.546$), outlining a very large tangential critical curve of major axis $\sim2.8\arcmin$, filling the field of HST/ACS....

Discovery of the largest known lensed images formed by a critically convergent lensing cluster (2009)

Zitrin, Adi, Broadhurst, Tom

We identify the largest known lensed images of a single spiral galaxy, lying close to the centre of the distant cluster MACS J1149.5+2223 ($z=0.544$). These images cover a total area of $\simeq 150...

Detailed Cluster Mass and Light profiles of A1703, A370 and RXJ1347-11 from Deep Subaru Imaging (2009)

Medezinski, Elinor, Broadhurst, Tom, Umetsu, Keiichi, Oguri, Masamune, Rephaeli, Yoel, Benítez, Narciso

We carefully examine the luminous content of three high mass clusters, A1703 (z=0.258), A370 (z=0.375) and RXJ1347-11 (z=0.45), with deep Subaru imaging. Accurate three-colour data allows us to...

New Multiply-Lensed Galaxies Identified in ACS/NIC3 Observations of Cl0024+1654, Using an Improved Mass Model (2009)

Zitrin, Adi, Broadhurst, Tom, Umetsu, Keiichi, Coe, Dan, Benítez, Narciso, Ascaso, Begoña, ...

We present an improved strong-lensing analysis of Cl0024+1654 ($z$=0.39) using deep HST/ACS/NIC3 images, based on 33 multiply-lensed images of 11 background galaxies. These are found with a model...

Preprint typeset using LATEX style emulateapj v. 10/10/03 MASS AND HOT BARYONS IN MASSIVE GALAXY CLUSTERS FROM SUBARU WEAK LENSING AND AMIBA SZE OBSERVATIONS 1 (2009)

Keiichi Umetsu, Mark Birkinshaw, Guo-chin Liu, Elinor Medezinski, Tom Broadhurst, ...

We present a multiwavelength analysis of a sample of four hot (TX> 8keV) X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBA Sunyaev-Zel’dovich effect (SZE) and Subaru weak...

Dynamical Study of A1689 from Wide-Field VLT/VIMOS Spectroscopy: Mass Profile, Concentration Parameter, and Velocity Anisotropy (2008)

Lemze, Doron, Broadhurst, Tom, Rephaeli, Yoel, Barkana, Rennan, Umetsu, Keiichi

We examine the internal dynamics and caustic structure of the rich cluster A1689, combining VLT/VIMOS spectroscopy with Subaru/Suprime-Cam imaging. The radial velocity distribution of $\sim 500$...

Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak Lensing and AMiBA SZE Observations (2008)

Umetsu, Keiichi, Birkinshaw, Mark, Liu, Guo-Chin, Wu, Jiun-Huei Proty, Medezinski, Elinor, Broadhurst, Tom, ...

We present a multiwavelength analysis of a sample of four hot (T_X>8keV) X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBA Sunyaev-Zel'dovich effect (SZE) and Subaru weak...

Observations of the Gas Reservoir around a Star Forming Galaxy in the Early Universe (2008)

Frye, Brenda L., Bowen, David. V., Hurley, Mairead, Tripp, Todd M., Fan, Xiaohui, Holden, Bradley, ...

We present a high signal-to-noise spectrum of a bright galaxy at z = 4.9 in 14 h of integration on VLT FORS2. This galaxy is extremely bright, i_850 = 23.10 +/- 0.01, and is strongly-lensed by the...

Comparison of Cluster Lensing Profiles with Lambda CDM Predictions (2008)

Broadhurst, Tom, Umetsu, Keiichi, Medezinski, Elinor, Oguri, Masamune, Rephaeli, Yoel

We derive lens distortion and magnification profiles of four well known clusters observed with Subaru. Each cluster is very well fitted by the general form predicted for Cold Dark Matter (CDM)...

z~7-10 Galaxies behind Lensing Clusters: Contrast with Field Search Results (2008)

Bouwens, Rychard J., Illingworth, Garth D., Bradley, Larry D., Ford, Holland, Franx, Marijn, Zheng, Wei, ...

We conduct a search for z>~7 dropout galaxies behind 11 massive lensing clusters using 21 arcmin**2 of deep HST NICMOS, ACS, and WFPC2 image data. In total, over this entire area, we find only one...

The SDSS Discovery of a Strongly Lensed Post-Starburst Galaxy at z=0.766 (2008)

Shin, Min-Su, Strauss, Michael A., Oguri, Masamune, Inada, Naohisa, Falco, Emilio E., Broadhurst, Tom, ...

We present the first result of a survey for strong galaxy-galaxy lenses in Sloan Digital Sky Survey (SDSS) images. SDSS J082728.70+223256.4 was selected as a lensing candidate using selection...

The third image of the large-separation lensed quasar SDSS J1029+26231 (2008)

Oguri, Masamune, Ofek, Eran O., Inada, Naohisa, Morokuma, Tomoki, Falco, Emilio E., Kochanek, Christopher S., ...

We identify a third image in the unique quasar lens SDSS J1029+2623, the second known quasar lens produced by a massive cluster of galaxies. The spectrum of the third image shows similar emission and...

The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623 (2008)

Oguri, Masamune, Ofek, Eran O., Inada, Naohisa, Morokuma, Tomoki, Falco, Emilio E., Kochanek, Christopher S., ...

We identify a third image in the unique quasar lens SDSS J1029+2623, the second known quasar lens produced by a massive cluster of galaxies. The spectrum of the third image shows similar emission and...

Large Einstein Radii: A Problem for LambdaCDM (2008)

Broadhurst, Tom, Barkana, Rennan

The Einstein radius of a cluster provides a relatively model-independent measure of the mass density of a cluster within a projected radius of ~ 150 kpc, large enough to be relatively unaffected by...

Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689 (2007)

Umetsu, Keiichi, Broadhurst, Tom

[Abridged] We derive a projected 2D mass map of the well studied galaxy cluster A1689 based on an entropy-regularized maximum-likelihood combination of the lens magnification and distortion of red...

Unusual Morphologies from the HST Snapshot Survey of BL Lac Objects: Three Optical Jets and A Possible Einstein Ring (2007)

C. Megan Urry, Riccardo Scarpa, Tom Broadhurst, Renato Falomo, Jochen Heidt, Aldo Treves, ...

We have carried out an HST snapshot survey of 108 BL Lac objects, at redshifts from z = 0.051 to z 1

Probing the Cluster Mass Distribution using Subaru Weak Lensing Data (2007)

Umetsu, Keiichi, Takada, Masahiro, Broadhurst, Tom

We present results from a weak lensing analysis of the galaxy cluster A1689 (z=0.183) based on deep wide-field imaging data taken with Suprime-Cam on Subaru telescope. A maximum entropy method has...

The Advanced Camera for Surveys (2006)

Narciso Benítez, Holland Ford, Garth Illingworth, Marc Postman, Tom Broadhurst

The Advanced Camera for Surveys

Using Weak Lensing Dilution to Improve Measurements of the Luminous and Dark Matter in A1689 (2006)

Medezinski, Elinor, Broadhurst, Tom, Umetsu, Keiichi, Coe, Dan, Benitez, Narciso, Ford, Holland, ...

The E/SO sequence of a cluster defines a boundary redward of which a reliable weak lensing signal can be obtained from background galaxies, uncontaminated by cluster members. For bluer colors, both...

The effect of FIR emission from SDSS galaxies on the SFD Galactic extinction map (2006)

Yahata, Kazuhiro, Yonehara, Atsunori, Suto, Yasushi, Turner, Edwin L., Broadhurst, Tom, Finkbeiner, Douglas P.

We compare the most successful and widely used map of Galactic dust extinction, provided by Schlegel, Finkbeiner & Davis (1998; hereafter SFD), to the galaxy number counts in the Sloan Digital Sky...

Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo? (2005)

Oguri, Masamune, Takada, Masahiro, Umetsu, Keiichi, Broadhurst, Tom

The steep mass profile of A1689 derived from recent detailed lensing observations is not readily reconciled with the low concentration halos predicted by the standard CDM model. However, halo...

The ALHAMBRA Survey: For a systematic Study of Cosmic Evolution (2005)

Moles, Mariano, Alfaro, Emilio, Benítez, Narciso, Broadhurst, Tom, Castander, Francisco J., Cepa, Jordi, ...

ALHAMBRA is a project to gather data to sample a fraction of the Universe with enough precision to follow the evolution of its content and properties with z, a kind of Cosmic Tomography. It is...

The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images (2004)

Broadhurst, Tom, Takada, Masahiro, Umetsu, Keiichi, Kong, Xu, Arimoto, Nobuo, Chiba, Masashi, ...

Subaru observations of A1689 (z=0.183) are used to derive an accurate, model-independent mass profile for the entire cluster, r

Probing Halos of Galaxies at Very Large Radii using Background QSOs (2004)

Cote, Stephanie, Wyse, Rosemary, Carignan, Claude, Freeman, Ken, Broadhurst, Tom

(ABRIDGED) Gaseous halos of nine nearby galaxies (with redshifts cz < 6000 km/s) were probed at large galactocentric radii using background quasars observed with HST GHRS and STIS. The projected...

Strong Lensing Analysis of A1689 from Deep Advanced Camera Images (2004)

Broadhurst, Tom, Benitez, Narciso, Coe, Dan, Sharon, Keren, Zekser, Kerry, White, Rick, ...

We analyse deep multi-colour Advanced Camera images of the largest known gravitational lens, A1689. Radial and tangential arcs delineate the critical curves in unprecedented detail and many small...

Monitoring lensed starlight emitted close to the Galactic Center (2004)

Nusser, Adi, Broadhurst, Tom

We describe the feasibility of detecting the gravitational deflection of light emitted by stars moving under the influence of the massive object at the Galactic center. Light emitted by a star...

Cloning Dropouts: Implications for Galaxy Evolution at High Redshift (2003)

Bouwens, Rychard J., Broadhurst, Tom, Illingworth, Garth

The evolution of high redshift galaxies in the two Hubble Deep Fields, HDF-N and HDF-S, is investigated using a cloning technique that replicates z~ 2-3 U dropouts to higher redshifts, allowing a...

The Advanced Camera for Surveys (2003)

Benítez , Narciso, Broadhurst , Tom, Ford , Holland, Illingworth , Garth, Postman , Marc

Spectral Evidence for Widespread Galaxy Outflows at z>4 (2001)

Frye, Brenda, Broadhurst, Tom, Benitez, Narciso

We present discovery spectra of a sample of eight lensed galaxies at high redshift, 3.7

Linking the Metallicity Distribution of Galactic Halo Stars to the Enrichment History of the Universe (2000)

Scannapieco, Evan, Broadhurst, Tom

We compare the metallicity distribution of Galactic Halo stars with 3D realizations of hierarchical galaxy formation. Outflows from dwarf galaxies enrich the intergalactic medium inhomogeneously, at...

The Influence of Galactic Outflows on the Formation of Nearby Dwarf Galaxies (2000)

Scannapieco, Evan, Ferrara, Andrea, Broadhurst, Tom

We show that the gas in growing density perturbations is vulnerable to the influence of winds outflowing from nearby collapsed galaxies that have already formed stars. This suggests that the...

The Role of Heating and Enrichment in Galaxy Formation (2000)

Scannapieco, Evan, Broadhurst, Tom

We show that the winds identified with high-redshift low-mass galaxies may strongly affect the formation of stars in more massive galaxies that form later. With 3D realizations of a simple linear...

Detecting the Gravitational Redshift of Cluster Gas (1999)

Broadhurst, Tom, Scannapieco, Evan

We examine the gravitational redshift of radiation emitted from within the potential of a cluster. Spectral lines from the intracluster medium (ICM) are redshifted in proportion to the...

Hubble Space Telescope Imaging of the CFRS and LDSS Redshift Surveys---III. Field elliptical galaxies at 0.2 < z < 1.0 (1999)

Schade, David, Lilly, S. J., Crampton, D., Ellis, R. S., Fevre, O. Le, Hammer, Francois, ...

Surface photometry has been performed on a sample of 46 field elliptical galaxies. These galaxies are described well by a deVaucouleurs R^{1/4} profile. The sample was selected from the combined...

Using the Comoving Maximum of the Galaxy Power Spectrum to Measure Cosmological Curvature (1999)

Broadhurst, Tom, Jaffe, Andrew H.

The large-scale maximum at k~0.05 identified in the power-spectrum of galaxy fluctuations provides a co-moving scale for measuring cosmological curvature. In shallow 3D surveys the peak is broad, but...

Young Red Spheroidal Galaxies in the Hubble Deep Fields: Evidence for a Truncated IMF at ~2M_solar and a Constant Space Density to z~2 (1999)

Broadhurst, Tom, Bouwens, Rychard J.

The optical-IR images of the Northern and Southern Hubble Deep Fields are used to measure the spectral and density evolution of early-type galaxies. The mean optical SED is found to evolve passively...

A Spectroscopic Redshift for the Cl0024+16 Multiple Arc System: Implications for the Central Mass Distribution (1999)

Broadhurst, Tom, Huang, Xiaosheng, Frye, Brenda, Ellis, Richard

We present a spectroscopic redshift of z=1.675 for the well-known multiply lensed system of arcs seen in the z=0.39 cluster Cl0024+16. In contrast to earlier work, we find that the lensed images are...

Deep Imaging of AXJ2019+112: The Luminosity of a ``Dark Cluster'' (1998)

Benitez, Narciso, Broadhurst, Tom, Rosati, Piero, Courbin, Fred, Squires, Gordon, Lidman, Chris, ...

We detect a distant cluster of galaxies centered on the QSO lens and luminous X-ray source AXJ2019+112, a.k.a. ``The Dark Cluster'' (Hattori et al 1997). Using deep V,I Keck images and wide-field K_s...

Detection of Evolved High-Redshift Galaxies in Deep NICMOS/VLT Images (1998)

Benitez, Narciso, Broadhurst, Tom, Bouwens, Rychard, Silk, Joseph, Rosati, Piero

A substantial population of high redshift early-type galaxies is detected in very deep UBVRIJHK images towards the HDF-South. Four elliptical profile galaxies are identified in the redshift range...

An HI Survey of LSB galaxies selected from the APM Survey (1998)

Cote, Stephanie, Broadhurst, Tom, Loveday, Jon, Kolind, Shannon

We present preliminary results of a neutral hydrogen (HI) redshift survey to find low surface brightness (LSB) galaxies in the very nearby universe. Our sample consists of all galaxies in the APM...

Cloning Hubble Deep Fields I: A Model-Independent Measurement of Galaxy Evolution (1998)

Bouwens, Rychard J., Broadhurst, Tom, Silk, Joseph

We present a model-independent method of quantifying galaxy evolution in high-resolution images, which we apply to the Hubble Deep Field (HDF). Our procedure is to k-correct all pixels belonging to...

Cloning Hubble Deep Fields II: Models for Evolution by Bright Galaxy Image Transformation (1998)

Bouwens, Rychard J., Broadhurst, Tom, Silk, Joseph

In a companion paper we outlined a methodology for generating parameter-free, model-independent ``no-evolution'' fields of faint galaxy images, demonstrating the need for significant evolution in the...

Hubble Space Telescope Imaging of the CFRS and LDSS Redshift Surveys. I. Morphological Properties (1998)

Brinchmann, Jarle, Abraham, Roberto, Schade, David, Tresse, Laurence, Ellis, Richard S., Lilly, Simon, ...