Long period planets from dynamical relaxation (2008)
Recent imaging campaigns indicate the likely existence of massive planets (~ 1-10 MJ) on ~1000 year orbits about a few percent of stars. Such objects are not easily explained in most current planet...
A low-redshift galaxy cluster X-ray Temperature Function incorporating Suzaku data (2008)
We present the first results of a survey of 14 low redshift galaxy clusters using Suzaku. Although luminous (L_x> 1\times 10^{43} erg s^{-1} (0.1-2.4 keV)), these clusters have no prior pointed X-ray...
Basu-Zych, Antara, Scharf, Caleb
We present evidence for a highly obscured X-ray source in one of two giant Ly-alpha emission nebulae in the z=3.09 proto-cluster region SSA22. Neither Ly-alpha nebula is associated with significant...
On Detecting the X-ray Silhouette of a Damped Lyman alpha System (2004)
Dijkstra, Mark, Haiman, Zoltan, Scharf, Caleb
We explore the possibility of resolving an image of a damped Lyman alpha (DLA) system in absorption against an extended, diffuse background X-ray source. Typical columns of neutral hydrogen in DLAs...
Donahue, Megan, Scharf, Caleb, Mack, Jennifer, Lee, Paul, Postman, Marc, Rosati, Piero, ...
We present and analyze the optical and X-ray catalogs of moderate-redshift cluster candidates from the ROSAT Optical X-ray Survey, or ROXS. The survey covers 4.8 square degrees (23 ROSAT PSPC...
Donahue, Megan, Mack, Jennifer, Scharf, Caleb, Lee, Paul, Postman, Marc, Rosati, Piero, ...
We present a comparison of X-ray and optical luminosities and luminosity functions of cluster candidates from a joint optical/X-ray survey, the ROSAT Optical X-Ray Survey. Completely independent...
Evidence for X-ray emission from a large-scale filament of galaxies ? (1999)
Scharf, Caleb, Donahue, Megan, Voit, G. Mark, Rosati, Piero, Postman, Marc
Cosmological simulations predict that a large fraction of the baryonic mass of the Universe exists as 10^5-10^7 K diffuse, X-ray emitting gas, tracing low density filament and sheet-like structures...
Tozzi, Paolo, Scharf, Caleb, Norman, Colin
The thermodynamics of the diffuse, X-ray emitting gas in clusters of galaxies is linked to the entropy level of the intra cluster medium. In particular, models that successfully reproduce the...
Large Scale Fluctuations in the X-Ray Background (1998)
Treyer, Marie, Scharf, Caleb, Lahav, Ofer, Jahoda, Keith, Boldt, Elihu, Piran, Tsvi
We present an attempt to measure the large angular scale fluctuations in the X-Ray Background (XRB) from the HEAO1-A2 data, expressed in terms of spherical harmonics. We model the harmonic...