Bogdanov, Slavko, Berg, Maureen Van Den, Heinke, Craig O., Cohn, Haldan N., Lugger, Phyllis M., Grindlay, Jonathan E.
We present a deep Chandra X-ray Observatory study of the peculiar binary radio millisecond pulsar PSR J1740--5340 and candidate millisecond pulsars (MSPs) in the globular cluster NGC 6397. The X-rays...
Radial Distribution of X-ray Point Sources near the Galactic Center (2009)
Hong, Jaesub, Berg, Maureen Van Den, Grindlay, Jonathan E., Laycock, Silas
(Abridged) We present the LogN-LogS and spatial distributions of X-ray point sources in seven Galactic Bulge (GB) fields within 4 deg from the Galactic Center (GC). We compare the properties of 1159...
Bogdanov, Slavko, Grindlay, Jonathan E.
We present deep XMM-Newton EPIC spectroscopic and timing X-ray observations of the nearby solitary radio millisecond pulsar, PSR J0030+0451. Its emission spectrum in the 0.1-10 keV range is found to...
Berg, Maureen Van Den, Hong, JaeSub, Grindlay, Jonathan E.
[Abridged] We have carried out a deep X-ray and optical survey with Chandra and HST of low-extinction regions in the Galactic bulge. Here we present the results of a search for low-luminosity (L_X ~2...
Chandra Discovery of an Intermediate Polar in Baade's Window (2009)
Hong, JaeSub, Berg, Maureen Van Den, Laycock, Silas, Grindlay, Jonathan E., Zhao, Ping
(Abridged) We have discovered an intermediate polar (IP) in the 100 ks Chandra observation of Baade's Window (BW), a low extinction region at ~ 4 deg south of the Galactic Center. The source exhibits...
The Dynamic X-ray Sky of the Local Universe (2009)
Soderberg, Alicia M., Grindlay, Jonathan E., Bloom, Joshua S., Gezari, Suvi, Piro, Anthony L., Belloni, Tomaso, ...
Over the next decade, we can expect time domain astronomy to flourish at optical and radio wavelengths. In parallel with these efforts, a dedicated transient "machine" operating at higher energies...
Commission 33 - Structure and dynamics of the galactic system (2009)
Gerhard, Ortwin, Wyse, Rosemary F., Whitelock, Patricia A., Efremov, Yuri N., Evans, Wyn, Flynn, Chris, ...
Investigating ChaMPlane X-ray sources in the Galactic Bulge with Magellan LDSS2 spectra (2008)
Koenig, Xavier, Grindlay, Jonathan E., Berg, Maureen Van Den, Laycock, Silas, Zhao, Ping, Hong, JaeSub, ...
We have carried out optical and X-ray spectral analyses on a sample of 136 candidate optical counterparts of X-ray sources found in five Galactic-bulge fields included in our Chandra Multi-wavelength...
Bogdanov, Slavko, Grindlay, Jonathan E., Rybicki, George B.
Abridged) We model the X-ray properties of millisecond pulsars (MSPs) by considering hot spot emission from a weakly magnetized rotating neutron star (NS) covered by an optically-thick hydrogen...
Chandra X-ray observatory observations of the globular cluster M71 (2008)
Elsner, Ronald F., Heinke, Craig O., Cohn, Haldan N., Lugger, Phyllis M., Maxwell, J. Edward, Stairs, Ingrid H., ...
An X-ray View of Radio Millisecond Pulsars (2007)
Bogdanov, Slavko, Grindlay, Jonathan E.
In recent years, X-ray observations with Chandra and XMM-Newton have significantly increased our understanding of rotation-powered (radio) millisecond pulsars (MSPs). Deep Chandra studies of several...
Cackett, Edward M., Miller, Jon M., Bhattacharyya, Sudip, Grindlay, Jonathan E., Homan, Jeroen, Van Der Klis, Michiel, ...
Using Suzaku observations of three neutron star low-mass X-ray binaries (Ser X-1, 4U 1820-30 and GX 349+2) we have found broad, asymmetric, relativistic Fe K emission lines in all three objects....
Jets, Blazars and the EBL in the GLAST-EXIST Era (2007)
Grindlay, Jonathan E., Team, The EXIST
The synergy of GLAST and the proposed EXIST mission as the Black Hole Finder Probe in the Beyond Einstein Program is remarkable. With its full-sky per orbit hard X-ray imaging (3-600 keV) and "nuFnu"...
AGN Variability Surveys: DASCH from BATSS to EXIST (2007)
Active galactic nuclei (AGN) are variable on a wide range of timescales, though relatively few systematic variability surveys have been conducted. Previous broad-band (both spectral and temporal)...
Constraints on Neutron Star Properties from X-ray Observations of Millisecond Pulsars (2006)
Bogdanov, Slavko, Rybicki, George B., Grindlay, Jonathan E.
We present a model of thermal X-ray emission from hot spots on the surface of a rotating compact star with an unmagnetized light-element atmosphere. An application to ROSAT, Chandra, and XMM-Newton...
Comptonization in the X-ray Spectra of Radio Millisecond Pulsars (2006)
Bogdanov, Slavko, Grindlay, Jonathan E., Rybicki, George B.
The majority of X-ray-detected rotation-powered millisecond pulsars (MSPs) appear to exhibit predominantly thermal emission, believed to originate from the heated magnetic polar caps of the pulsar....
Chandra X-ray Sources in the Collapsed-Core Globular Cluster M30 (NGC 7099) (2006)
Lugger, Phyllis M., Cohn, Haldan N., Heinke, Craig O., Grindlay, Jonathan E., Edmonds, Peter D.
We report the detection of six discrete, low-luminosity (Lx < 10^33 erg/s) X-ray sources, located within 12 arcsec of the center of the collapsed-core globular cluster M30 (NGC 7099), and a total of...
X-rays from Radio Millisecond Pulsars: Comptonized Thermal Radiation (2006)
Bogdanov, Slavko, Grindlay, Jonathan E., Rybicki, George B.
X-ray emission from many rotation-powered millisecond pulsars (MSPs) is observed to be of predominantly thermal nature. In PSR J0437--4715, the nearest MSP known, an additional faint power-law tail...
A Neutron Star in F-sharp (2006)
In this short introductory commentary on the paper (Hessels et al 2006, Science, 311, 1901) reporting the discovery of the shortest spin period millisecond pulsar (MSP) Ter5-ad in the globular...
Compact X-ray Binaries in and out of Core Collapsed Globulars (2006)
We review new Chandra and HST observations of the core collapsed cluster NGC 6397 as a guide to understanding the compact binary (CB) populations in core collapse globulars. New cataclysmic variables...
Post-Swift Gamma-ray Burst Science and Capabilities Needed to EXIST (2006)
The exhilerating results from Swift in its first year of operations have opened a new era of exploration of the high energy universe. The surge to higher redshifts of the Gamma-ray bursts now imaged...
Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae (2006)
Bogdanov, Slavko, Grindlay, Jonathan E., Heinke, Craig O., Camilo, Fernando, Freire, Paulo C. C., Becker, Werner
We present spectral and long-timescale variability analyses of \textit{Chandra} ACIS-S observations of the 19 millisecond pulsars (MSPs) with precisely known positions in the globular cluster 47...
Chandra X-ray observations of 19 millisecond pulsars in the globular cluster 47 Tucanae (2006)
Bogdanov, Slavko, Grindlay, Jonathan E., Heinke, Craig O., Camilo, Fernando, Freire, Paulo C. C., Becker, Werner
Interacting X-ray Binaries in Globular Clusters: 47Tuc vs. NGC 6397 (2005)
Our deep Chandra exposures of 47Tuc and moderate exposures of NGC 6397 reveal a wealth of new phenomena for interacting X-ray binaries (IXBs) in globular clusters. In this (late) Review, updated...
EXIST: All-Sky Hard X-ray Imaging and Spectral-Temporal Survey for Black Holes (2005)
The Energetic X-ray Imaging Survey Telescope (EXIST) is under study for the proposed Black Hole Finder Probe, one of the three Einstein Probe missions in NASA's proposed Beyond Einstein Program....
Hong, JaeSub, Berg, Maureen Van Den, Schlegel, Eric M., Grindlay, Jonathan E., Koenig, Xavier, Laycock, Silas, ...
We describe the X-ray analysis procedure of the on-going Chandra Multiwavelength Plane (ChaMPlane) survey and report the initial results from the analysis of 15 selected anti-Galactic center...
ChaMPlane Optical Survey: Mosaic Photometry (2005)
Zhao, Ping, Grindlay, Jonathan E., Hong, JaeSub, Laycock, Silas, Koenig, Xavier P., Schlegel, Eric M., ...
The ChaMPlane survey to identify and analyze the serendipitous X-ray sources in deep Galactic plane fields incorporates the ChaMPlane Optical Survey, which is one of NOAO's Long-term Survey Programs....
Heinke, Craig O., Rybicki, George B., Narayan, Ramesh, Grindlay, Jonathan E.
Current X-ray missions are providing high-quality X-ray spectra from neutron stars (NSs) in quiescent low-mass X-ray binaries (qLMXBs). This has motivated us to calculate new hydrogen-atmosphere...
Bogdanov, Slavko, Grindlay, Jonathan E., Berg, Maureen Van Den
We report the discovery of peculiar X-ray spectral variability in the binary radio millisecond pulsar PSR J0024--7204W in the globular cluster 47 Tucanae. The observed emission consists of a dominant...
Chandra Studies of Millisecond Pulsars in Globular Clusters (2004)
The high resolution X-ray imaging and broad-band moderate resolution spectra enabled by the ACIS cameras on the Chandra X-ray Observatory have opened a new window in our study of millisecond pulsars...
New spectral classification technique for X-ray sources: quantile analysis (2004)
Hong, Jaesub, Schlegel, Eric M., Grindlay, Jonathan E.
We present a new technique called "quantile analysis" to classify spectral properties of X-ray sources with limited statistics. The quantile analysis is superior to the conventional approaches such...
Hard X-ray Timing with EXIST (2004)
The Energetic X-ray Timing Survey Telescope (EXIST) mission concept is under study as the Black Hole Finder Probe (BHFP), one of the three Einstein Probe missions in the Beyond Einstein Program in...
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...
Edmonds, Peter D., Gilliland, Ronald L., Heinke, Craig O., Grindlay, Jonathan E.
We report the largest number of optical identifications of X-ray sources yet obtained in a single globular cluster. Using deep Chandra/ACIS-I imaging and extensive HST studies with WFPC2, we have...
Edmonds, Peter D., Gilliland, Ronald L., Heinke, Craig O., Grindlay, Jonathan E.
We report time series and variability information for the optical identifications of X-ray sources in 47 Tuc reported in Paper I. The eight CVs with secure orbital periods have fainter accretion...
Background measurements from balloon-borne CZT detectors (2003)
Jenkins, Johnathan A., Narita, Tomohiko, Grindlay, Jonathan E., Bloser, Peter F., Stahle, Carl, Parker, Brad, ...
Background Measurements from Balloon-Borne CZT Detectors (2002)
Jenkins, Johnathan A, Narita, Tomohiko, Grindlay, Jonathan E., Bloser, Peter F., Stahle, Carl, Parker, Brad, ...
We report detector characteristics and background measurements from two prototype imaging CZT detectors flown on a scientific balloon payload in May 2001. The detectors are both platinum-contact 10mm...
Edmonds, Peter D., Gilliland, Ronald L., Camilo, Fernando, Heinke, Craig O., Grindlay, Jonathan E.
Using extensive HST imaging, combined with Chandra X-ray and Parkes radio data, we have detected the optical binary companion to a second millisecond pulsar (MSP) in the globular cluster 47 Tucanae....
Metchev, Stanimir A., Grindlay, Jonathan E.
We present a two-dimensional version of the classical one-dimensional Kolmogorov-Smirnov (K-S) test, extending an earlier idea due to Peacock (1983) and an implementation proposed by Fasano &...
HST-NICMOS Observations of Terzan 5: Stellar Content and Structure of the Core (2002)
Cohn, Haldan N., Lugger, Phyllis M., Grindlay, Jonathan E., Edmonds, Peter D.
We report results from HST-NICMOS imaging of the extremely dense core of the globular cluster Terzan 5. This highly obscured bulge cluster has been estimated to have one of the highest collision...
Detection of a Quiescent Low Mass X-Ray Binary Companion in 47 Tucanae (2001)
Edmonds, Peter D., Heinke, Craig O., Grindlay, Jonathan E., Gilliland, Ronald L.
We present the results of a search for optical counterparts to the two quiescent low mass X-ray binaries (X5 and X7) in the globular cluster 47 Tucanae, using high quality Chandra and HST images. A...
Wijnands, Rudy, Heinke, Craig O., Grindlay, Jonathan E.
We present a short (~3.6 ks) Chandra/HRC-I observation of the globular cluster Terzan 1. This cluster is known to contain the bright neutron star low-mass X-ray binary X 1732-304 which was active...
Optical Detection of a Variable Millisecond Pulsar Companion in 47 Tucanae (2001)
Edmonds, Peter D., Gilliland, Ronald L., Heinke, Craig O., Grindlay, Jonathan E., Camilo, Fernando
Using results from radio and X-ray observations of millisecond pulsars in 47 Tucanae, and extensive HST U, V, I imaging of the globular cluster core, we have derived a common astrometric solution...
High Resolution X-ray Imaging of a Globular Cluster Core: Compact Binaries in 47Tuc (2001)
Grindlay, Jonathan E., Heinke, Craig, Edmonds, Peter D., Murray, Stephen S.
We have obtained high resolution (
Magnetic CVs in Globular Clusters (1999)
Cataclysmic variables (CVs) are tracers of dynamical evolution in globular clusters. A significant sample has been found by the relatively shallow \Halpha surveys conducted with HST thus far in just...
Cataclysmic Variables and a Candidate Helium White Dwarf in the Globular Cluster NGC 6397 (1998)
Edmonds, Peter D., Grindlay, Jonathan E., Cool, Adrienne M., Cohn, Haldan N., Lugger, Phyllis N., Bailyn, Charles D.
We have used HST/FOS to study faint UV stars in the core of the nearby globular cluster NGC 6397. We confirm the presence of a 4th cataclysmic variable (CV) in NGC 6397 (CV 4), and we use the...
Cataclysmic Variables and a New Class of Faint UV Stars in the Globular Cluster NGC 6397 (1998)
Cool, Adrienne M., Grindlay, Jonathan E., Cohn, Haldan N., Lugger, Phyllis N., Bailyn, Charles D.
We present evidence that the globular cluster NGC 6397 contains two distinct classes of centrally-concentrated UV-bright stars. Color-magnitude diagrams constructed from U, B, V, and I data obtained...
Fast X-ray Transients and Gamma-ray Bursts: Constraints on Beaming (1998)
The detection of x-ray afterglows of gamma-ray burst (GRB) sources has enabled the optical discovery that GRBs are at cosmological distances, which confirms that the enormous luminosities required...
Spin-Up of Low Luminosity Low Mass X-ray Binaries (1998)
Yi, Insu, Grindlay, Jonathan E.
We examine the spin-up of low luminosity, low mass X-ray binaries (LMXBs) to millisecond pulsars (MSPs). In the conventional spin-up model of the Ghosh & Lamb type, where the stellar magnetic field...
Lum, Kenneth S. K., Mohr, Joseph J., Barret, Didier, Grindlay, Jonathan E., Manandhar, Raj P.
We have modelled the hard X-ray background expected for a high-altitude balloon flight of the Energetic X-ray Telescope Experiment (EXITE2), an imaging phoswich detector/telescope for the 20--600 keV...
Balloon-Borne Hard X-Ray Imaging and Future Surveys (1997)
Several payloads for hard X-ray (20-600 keV) imaging with coded aperture telescopes have been developed for balloon flight observations of cosmic x-ray sources. We briefly review the characteristics...
Surveying the Hard X-ray Sky: Imaging in Space and Time (1997)
One of the few remaining astronomical bands (factor of $\sim$10 in energy range) still without an all-sky imaging survey is the hard x-ray band (10-600 keV). This is in spite of sensitive imaging...
Narayan, Ramesh, Mahadevan, Rohan, Grindlay, Jonathan E., Popham, Robert G., Gammie, Charles
Sgr A* at the Galactic Center is a puzzling source. It has a mass M=(2.5+/-0.4) x 10^6 solar masses which makes it an excellent black hole candidate. Observations of stellar winds and other gas flows...
Pulse Profiles of Millisecond Pulsars (1996)
Jayawardhana, Ray, Grindlay, Jonathan E.
We present a comparison between the average radio pulse profiles of millisecond pulsars (MSPs) in the field and in globular clusters. Our sample consists of 20 field MSPs and 25 cluster MSPs for...
Halo/Thick Disk CVs and the Cosmic X-Ray Background (1994)
Grindlay, Jonathan E., Maoz, Eyal
In a recent study (Maoz and Grindlay 1995) we have found that a number of previously recognized anomalies in the diffuse x-ray background at soft energies (\sim 0.5-2 keV) can be understood if about...
Extensive air shower studies of cosmic gamma-rays and cosmic ray composition / (1971)
Thesis (Ph. D.)--Harvard University, 1971.