X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 (2009)
Lan, Shih Hao, Kong, Albert K. H., Verbunt, Frank, Lewin, Walter H. G., Bassa, Cees, Anderson, Scott F., ...
We report on the Chandra X-ray Observatory and Hubble Space Telescope observation of two low core density globular clusters, NGC6144 and E3. By comparing the number of X-ray sources inside the...
X-rays from the explosion site: Fifteen years of light curves of SN 1993J (2009)
Chandra, Poonam, Dwarkadas, Vikram V., Ray, Alak, Immler, Stefan, Pooley, David
We present a comprehensive analysis of the X-ray light curves of SN 1993J in a nearby galaxy M81. This is the only supernova other than SN 1987A, which is so extensively followed in the X-ray bands....
X-ray Sources and Their Optical Counterparts in the Galactic Globular Cluster M12 (NGC 6218) (2009)
Lu, Ting-Ni, Kong, Albert K. H., Bassa, Cees, Verbunt, Frank, Lewin, Walter H. G., Anderson, Scott F., ...
We study a Chandra X-ray Observatory ACIS-S observation of the Galactic globular clusterM12. With a 26 ks exposure time, we detect 6 X-ray sources inside the half-mass radius (2.16 arcminutes) of...
How rapidly do neutron stars spin at birth? (2008)
Soria, Roberto, Perna, Rosalba, Pooley, David, Stella, Luigi
We have studied the X-ray properties of ageing historical core-collapse supernovae in nearby galaxies, using archival data from Chandra, XMM-Newton and Swift. We found possible evidence of a young...
The Long-Term Variability of the X-Ray Sources in NGC 6946 and NGC 4485/4490 (2008)
Fridriksson, Joel K., Homan, Jeroen, Lewin, Walter H. G., Kong, Albert K. H., Pooley, David
We analyze data from five Chandra observations of the spiral galaxy NGC 6946 and from three Chandra observations of the irregular/spiral interacting galaxy pair NGC 4485/4490, with an emphasis on...
Unstructured Meshing for Two Asset Barrier Options (2007)
David Pooley, Peter A. Forsyth, Ken Vetzal, R. Bruce Simpson
. Discretely observed barriers introduce discontinuities in the solution of two asset option pricing partial differential equations (PDE's) at barrier observation dates. Consequently, accurate...
Pooley, David, Blackburne, Jeffrey A., Rappaport, Saul, Schechter, Paul L.
X-ray and optical observations of quadruply lensed quasars can provide a microarcsecond probe of the lensed quasar, corresponding to scale sizes of \~10^2-10^4 gravitational radii of the central...
Dynamical Formation of Close Binaries in Globular Clusters II: Cataclysmic Variables (2006)
We answer the long-standing question of which production mechanism is responsible for the cataclysmic variables (CVs) in globular clusters. Arguments have been given that range from mostly primordial...
X-rays from the Globular Cluster G1: Intermediate Mass Black Hole or Low Mass X-ray Binary? (2006)
Pooley, David, Rappaport, Saul
The globular cluster G1 (Mayall II) in M31 is the most massive (~10^7 M_sun) stellar cluster in the Local Group, and it has the highest central velocity dispersion (~28 km/s). It has been claimed to...
Discovery of a 3.6-hr Eclipsing Luminous X-Ray Binary in the Galaxy NGC 4214 (2006)
Ghosh, Kajal K., Rappaport, Saul, Tennant, Allyn F., Swartz, Douglas A., Pooley, David, Madhusudhan, N.
We report the discovery of an eclipsing X-ray binary with a 3.62-hr period within 24" of the center of the dwarf starburst galaxy NGC 4214. The orbital period places interesting constraints on the...
A Strong X-Ray Flux Ratio Anomaly in the Quadruply Lensed Quasar PG 1115+080 (2006)
Pooley, David, Blackburne, Jeffrey A., Rappaport, Saul, Schechter, Paul L., Fong, Wen-fai
PG 1115+080 is a quadruply lensed quasar at z=1.72 whose image positions are well fit by simple models of the lens galaxy (at z=0.31). At optical wavelengths, the bright close pair of images exhibits...
X-ray and Optical Eclipses in ULXs as Possible Indicators of Black Hole Mass (2005)
Pooley, David, Rappaport, Saul
Ultraluminous X-ray sources (ULXs) with 10^39 < L_x < 10^41 erg/s have been discovered in great numbers in external galaxies with ROSAT, Chandra, and XMM-Newton. The central question regarding this...
The Calibration of the Swift/UVOT Optical Observations: A Recipe for Photometry (2005)
Li, Weidong, Jha, Saurabh, Filippenko, Alexei V., Bloom, Joshua S., Pooley, David, Foley, Ryan J., ...
Swift/UVOT has the capability to provide critical insight into the physics of the early afterglows of gamma-ray bursts (GRBs). But without precise calibration of the UVOT to standard photometric...
Late-time X-Ray, UV and Optical Monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
We present results from observations of SN 1979C with XMM-Newton in X-rays and in the UV, archival X-ray and HST data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows...
Late-time X-ray, UV, and optical monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
Cackett, Edward M., Wijnands, Rudy, Heinke, Craig O., Edmonds, Peter D., Lewin, Walter H. G., Pooley, David, ...
The globular cluster NGC 6440 is known to harbor a bright neutron-star X-ray transient. We observed the globular cluster with Chandra on two occasions when the bright transient was in its quiescent...
X-ray Sources and their Optical Counterparts in the Globular Cluster M4 (2004)
Bassa, Cees, Pooley, David, Homer, Lee, Verbunt, Frank, Gaensler, Bryan M., Lewin, Walter H. G., ...
We report on the Chandra X-ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster...
Wijnands, Rudy, Heinke, Craig O., Pooley, David, Edmonds, Peter D., Lewin, Walter H. G., Grindlay, Jonathan E., ...
We present a Chandra observation of the globular cluster Terzan 5 during times when the neutron-star X-ray transient EXO 1745-248 located in this cluster was in its quiescent state. We detected the...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial differential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and efficient...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial differential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and efficient...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial differential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and efficient...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial differential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and efficient...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial di#erential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and e#cient...
Numerical Methods for Nonlinear Equations in Option Pricing (2003)
This thesis explores numerical methods for solving nonlinear partial differential equations (PDEs) that arise in option pricing problems. The goal is to develop or identify robust and efficient...
Pooley, David, Lewin, Walter H. G., Verbunt, Frank, Homer, Lee, Margon, Bruce, Gaensler, Bryan M., ...
As part of our campaign to determine the nature of the various source populations of the low-luminosity globular cluster X-ray sources, we have obtained a Chandra X-ray Observatory ACIS-S3 image of...