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 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....
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...
Cluster contribution to the X-ray background as a cosmological probe (2009)
Lemze, Doron, Sadeh, Sharon, Rephaeli, Yoel
Extensive measurements of the X-ray background (XRB) yield a reasonably reliable characterisation of its basic properties. Having resolved most of the cosmic XRB into discrete sources, the levels and...
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...
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 $\sim 500$...
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)...
There is some observational evidence for earlier evolution of clusters of galaxies than predicted in the standard LambdaCDM model with a Gaussian primordial density fluctuation field, and a low value...
Mass and Gas Profiles in A1689: Joint X-ray and Lensing Analysis (2007)
Lemze, Doron, Barkana, Rennan, Broadhurst, Tom J., Rephaeli, Yoel
We carry out a comprehensive joint analysis of high quality HST/ACS and Chandra measurements of A1689, from which we derive mass, temperature, X-ray emission and abundance profiles. The X-ray...
High Energy Emission from Starburst Galaxies and Clusters (2007)
Yoel Rephaeli, Charles D. Dermer
Abstract. Detection of diffuse high energy X-ray and fl-ray emission from starburst galaxies and clusters of galaxies will significantly advance the study of these systems. We review the results of...
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...
Long RXTE Observations of A2163 (2006)
Rephaeli, Yoel, Gruber, Duane, Arieli, Yinon
A2163 was observed by the RXTE satellite for 530 ks during a 6 month period starting in August 2004. The cluster primary emission is from very hot intracluster gas with kT~15 keV, but this component...
Discovery of Rapid X-ray Oscillations in the Tail of the SGR 1806-20 Hyperflare (2005)
Israel, GianLuca, Belloni, Tomaso, Stella, Luigi, Rephaeli, Yoel, Gruber, Duane, Casella, Pier Giorgio, ...
We have discovered rapid Quasi Periodic Oscillations (QPOs) in RXTE/PCA measurements of the pulsating tail of the 27th December 2004 giant flare of SGR 1806-20. QPOs at about 92.5Hz are detected in a...
2-100 keV Spectrum of an Actively Star Forming Galaxy (2004)
Persic, Massimo, Rephaeli, Yoel
We compute the synthetic 2-100 keV spectrum of an actively star forming galaxy. To this aim we use a luminosity function of point sources appropriate for starbursts (based on Chandra data), as well...
Spectral Analysis of RXTE Observations of A3667 (2004)
X-ray emission from the cluster of galaxies A3667 was measured by the PCA and HEXTE experiments aboard the RXTE satellite during the period December 2001 - July 2002. Analysis of the ~141 ks RXTE...
Relativistic Electrons & Magnetic Fields in Clusters of Galaxies (2004)
RXTE and BeppoSAX observations have yielded evidence for the presence of a secondary power-law spectral component in the spectra of several clusters of galaxies. This emission in clusters with...
CMB Comptonization in Clusters: Spectral and Angular Power from Evolving Polytropic Gas (2003)
The angular power spectrum of the Sunyaev-Zeldovich (SZ) effect is calculated in the $\Lambda$CDM cosmological model with the aim of investigating its detailed dependence on the cluster population,...
Quantitative Description of the Sunyaev-Zeldovich Effect: Analytic Approximations (2003)
Various aspects of relativistic calculations of the Sunyaev-Zeldovich effect are explored and clarified. We first formally show that the main previous approaches to the calculation of the...
RXTE Observations of A2256 (2003)
The cluster of galaxies A2256 was observed by the PCA and HEXTE experiments aboard the RXTE satellite during the period July 2001 - January 2002, for a total of 343 ks and 88 ks, respectively. Most...
Dark Matter Profiles in Clusters of Galaxies: a Phenomenological Approach (2003)
There are some basic differences between the observed properties of galaxies and clusters and the predictions from current hydrodynamical simulations. These are particularly pronounced in the central...
Cosmology with the S-Z Effect (2002)
Extensive recent work on the Sunyaev-Zeldovich (S-Z) effect reflects major progress in observational capabilities of interferometric arrays, the improved quality of multi-frequency measurements with...
Results from a Second RXTE Observation of the Coma Cluster (2002)
The RXTE satellite observed the Coma cluster for 177 ksec during November and December 2000, a second observation motivated by the intriguing results from the first 87 ksec observation in 1996....
Quantification of Uncertainty in the Measurement of Magnetic Fields in Clusters of Galaxies (2002)
Newman, William I., Newman, Alice L., Rephaeli, Yoel
We assess the principal statistical and physical uncertainties associated with the determination of magnetic field strengths in clusters of galaxies from measurements of Faraday rotation (FR) and...
RXTE View of the Starburst Galaxies M82 and NGC 253 (2002)
The two nearby starburst galaxies M82 and NGC 253 were observed for 100 ksec over a 10-month period in 1997. An increase of the M82 flux by a factor ~2 was measured during the period July-November,...
The Sunyaev-Zeldovich Effect and Its Cosmological Significance (2001)
Comptonization of the cosmic microwave background (CMB) radiation by hot gas in clusters of galaxies - the Sunyaev-Zeldovich (S-Z) effect - is of great astrophysical and cosmological significance. In...
The cluster of galaxies A2319 was observed in 1999 for 160 ks by the PCA and HEXTE instruments aboard the RXTE satellite. No noticeable variability is seen in the emission measured by either...
Nonthermal Phenomena in Clusters of Galaxies (2001)
Recent observations of high energy (> 20 keV) X-ray emission in a few clusters extend and broaden our knowledge of physical phenomena in the intracluster space. This emission is likely to be...
The Sunyaev-Zeldovich Effect: Current Status and Future Prospects (2001)
The detailed spectral and spatial characteristics of the signature imprinted on the cosmic microwave background (CMB) radiation by Compton scattering of the radiation by electrons in the hot gas in...
High Energy X-Ray Emission in Clusters of Galaxies (2001)
Observations with the RXTE and SAX satellites have recently led to the measurement of a second component in the spectra of several clusters of galaxies which are known to have regions of extended...
The Sunyaev-Zeldovich MITO Project (2000)
D'Alba, Livia, Melchiorri, Francesco, De Petris, Marco, Orlando, Angiola, Lamagna, Luca, Rephaeli, Yoel, ...
Compton scattering of the cosmic microwave background radiation by electrons in the hot gas in clusters of galaxies - the Sunyaev-Zeldovich effect - has long been recognized as a uniquely important...