Publications (41)
Heliophysics Discovery Tools for the 21st Century: Data Science and Machine Learning Structures and Recommendations for 2020-2050
R. M. McGranaghan, B. Thompson, E. Camporeale +14
Three main points: 1. Data Science (DS) will be increasingly important to heliophysics; 2. Methods of heliophysics science discovery will continually evolve, requiring the use of l…
The growth and evolution of super massive black holes
S. Murray, R. Gilli, P. Tozzi +19
We discuss the central role played by X-ray studies to reconstruct the past history of formation and evolution of supermassive Black Holes (BHs), and the role they played in shapin…
The Very Local Universe in X-rays
A. Ptak, E. Feigelson, Y. -H. Chu +25
While the exceptional sensitivity of Chandra and XMM-Newton has resulted in revolutionary studies of the Galactic neighborhood in the soft (<10 keV) X-ray band, there are many open…
Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
M. Markevitch, A. H. Gonzalez, D. Clowe +6
We compare new maps of the hot gas, dark matter, and galaxies for 1E0657-56, a cluster with a rare, high-velocity merger occurring nearly in the plane of the sky. The X-ray observa…
High Resolution X-ray Observations of the Pulsar Wind Nebula Associated with the Gamma-ray Source HESSJ1640-465
A. Lemiere, P. Slane, B. M. Gaensler +1
We present a Chandra X-ray observation of the very high energy -ray source HESSJ1640-465. We identify a point source surrounded by a diffuse emission that fills the extended…
Epoch of Reionization Power Spectrum Limits from Murchison Widefield Array Data Targeted at EoR1 Field
M. Rahimi, B. Pindor, J. L. B. Line +28
Current attempts to measure the 21cm Power Spectrum of neutral hydrogen during the Epoch of Reionization are limited by systematics which produce measured upper limits above both t…
The Mid-Infrared Properties of X-ray Sources
V. Gorjian, M. Brodwin, C. S. Kochanek +16
We combine the results of the Spitzer IRAC Shallow Survey and the Chandra XBootes Survey of the 8.5 square degrees Bootes field of the NOAO Deep Wide- Field Survey to produce the l…
High-resolution x-ray telescopes
S. L. O'Dell, R. J. Brissenden, W. N. Davis +21
High-energy astrophysics is a relatively young scientific field, made possible by space-borne telescopes. During the half-century history of x-ray astronomy, the sensitivity of foc…
Chandra Observations of the Stellar Populations and Diffuse Gas in Nearby Galaxies
A. Zezas, G. Fabbiano, A. Prestwich +2
We present Chandra observations of two star-forming galaxies (M82 and the Antennae) and three starburst/AGN composite galaxies (NGC1808, NGC6240, NGC7331). In both star-forming gal…
A High Angular Resolution View of Hot Gas in Clusters, Groups, and Galaxies
W. Forman, E. Churazov, L. David +6
We discuss two themes from Chandra and XMM-Newton observations of galaxies, groups, and clusters. First, we review observational aspects of cluster formation and evolution as matte…
An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
M. C. Weisskopf, B. Brinkman, C. Canizares +3
The Chandra X-Ray Observatory (CXO), the x-ray component of NASA's Great Observatories, was launched on 1999, July 23 by the Space Shuttle Columbia. After satellite systems activat…
RF Positive Ion Source with Solenoidal Magnetic Field
V. Dudnikov, R. P. Johnson, B. Han +8
A positive ion source with RF discharge in solenoidal magnetic field is described. In this paper we present an overview of positive ion production in saddle antenna (helicon discha…
X-ray Cluster Cosmology
A. Vikhlinin, S. Murray, R. Gilli +18
Sensitive, wide-area X-ray surveys which would be possible with the WFXT will detect huge samples of virialized objects spanning the mass range from sub-groups to the most massive…
Baryon Content in a Sample of 91 Galaxy Clusters Selected by the South Pole Telescope at 0.2 < z < 1.25
I. Chiu, J. J. Mohr, M. McDonald +89
We estimate total mass (), intracluster medium (ICM) mass () and stellar mass () in a Sunyaev-Zel'dovich effect (SZE) selected sample of 91 ga…
Chandra Observations of NGC 4636 - An Elliptical Galaxy in Turmoil
C. Jones, W. Forman, A. Vikhlinin +5
Chandra images show symmetric, 8 kpc long, arm-like features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperatur…
Observations of the recurrent M31 transient XMMU~J004215.8+411924 with Swift, Chandra, HST and Einstein
R. Barnard, M. Garcia, S. Murray +2
The transient X-ray source XMMU J004215.8+411924 within M31 was found to be in outburst again in the 2010 May 27 Chandra observation. We present results from our four Chandra and s…
A New Way to Detect Massive Black Holes in Galaxies: The Stellar Remnants of Tidal Disruption
R. Di Stefano, J. Greiner, S. Murray +1
We point out that the tidal disruption of a giant may leave a luminous (10^35-10^39 ergs/s), hot (10-100 eV) stellar core. The ``supersoft'' source detected by Chandra at the cente…
Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array
Cathryn M. Trott, Catherine A. Watkinson, Christopher H. Jordan +42
We apply two methods to estimate the 21~cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired wit…
Using XDAQ in Application Scenarios of the CMS Experiment
L. Berti, V. Brigljevic, G. Bruno +31
XDAQ is a generic data acquisition software environment that emerged from a rich set of of use-cases encountered in the CMS experiment. They cover not the deployment for multiple s…
Constraining the 21cm brightness temperature of the IGM at =6.6 around LAEs with the Murchison Widefield Array
Cathryn M. Trott, C. H. Jordan, J. L. B. Line +29
The locations of Ly- emitting galaxies (LAEs) at the end of the Epoch of Reionisation (EoR) are expected to correlate with regions of ionised hydrogen, traced by the redshifted…
Run Control and Monitor System for the CMS Experiment
M. Bellato, L. Berti, V. Brigljevic +30
The Run Control and Monitor System (RCMS) of the CMS experiment is the set of hardware and software components responsible for controlling and monitoring the experiment during data…
Negative ion radio frequency surface plasma source with solenoidal magnetic field
V. Dudnikov, R. P. Johnson, B. Han +8
Pulsed and CW operation of negative ion radio frequency surface plasma source with a solenoidal magnetic field is described. Dependences of a beam current on RF power, extraction v…
A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
M. Markevitch, A. H. Gonzalez, L. David +5
The Chandra image of the merging, hot galaxy cluster 1E0657-56 reveals a bow shock propagating in front of a bullet-like gas cloud just exiting the disrupted cluster core. This is…
From Design to Production Control Through the Integration of Engineering Data Management and Workflow Management Systems
J-M. Le Goff, G. Chevenier, A. Bazan +10
At a time when many companies are under pressure to reduce "times-to-market" the management of product information from the early stages of design through assembly to manufacture a…
Wide Field X-ray Telescope: Mission Overview
P. Rosati, S. Borgani, R. Gilli +9
The Wide Field X-Ray Telescope (WFXT) is a medium-class mission designed to be 2-orders-of-magnitude more sensitive than any previous or planned X-ray mission for large area survey…
Detector Construction Management and Quality Control: Establishing and Using a CRISTAL System
J-M. Le Goff, G. Chevenier, A. Bazan +10
The CRISTAL (Cooperating Repositories and an Information System for Tracking Assembly Lifecycles) project is delivering a software system to facilitate the management of the engine…
Chandra Observations of M31 and their Implications for its ISM
F. Primini, M. Garcia, S. Murray +3
We have been regularly observing the bulge and inner disk of M31 for nearly 1 year, using both the HRC-I and ACIS-I instruments on the Chandra X-Ray Observatory. We present results…
Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations
N. Charles, N. S. Kern, R. Pascua +80
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). This has led to the construction of low-frequency radio i…
First Season MWA Phase II EoR Power Spectrum Results at Redshift 7
W. Li, J. C. Pober, N. Barry +44
The compact configuration of Phase II of the Murchison Widefield Array (MWA) consists of both a redundant subarray and pseudo-random baselines, offering unique opportunities to per…
Comparing Redundant and Sky Model Based Interferometric Calibration: A First Look with Phase II of the MWA
W. Li, J. C. Pober, B. J. Hazelton +53
Interferometric arrays seeking to measure the 21 cm signal from the Epoch of Reionization must contend with overwhelmingly bright emission from foreground sources. Accurate recover…
The Cluster and Field Galaxy AGN Fraction at z = 1 to 1.5: Evidence for a Reversal of the Local Anticorrelation Between Environment and AGN Fraction
Paul Martini, Eric D. Miller, M. Brodwin +13
The fraction of cluster galaxies that host luminous AGN is an important probe of AGN fueling processes, the cold ISM at the centers of galaxies, and how tightly black holes and gal…
Djehuty, a Code for Modeling Stars in Three Dimensions
G. Bazan, D. S. P. Dearborn, D. D. Dossa +10
Current practice in stellar evolution is to employ one-dimensional calculations that quantitatively apply only to a minority of the observed stars (single non-rotating stars, or we…
The CMS Event Builder
V. Brigljevic, G. Bruno, E. Cano +32
The data acquisition system of the CMS experiment at the Large Hadron Collider will employ an event builder which will combine data from about 500 data sources into full events at…
Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
A. Bonaldi, P. Hartley, R. Braun +179
We present and analyse the results of the Science data challenge 3a (SDC3a, https://sdc3.skao.int/challenges/foregrounds), an EoR foreground-removal community-wide exercise organis…
Luminous WISE-selected Obscured, Unobscured, and Red Quasars in Stripe 82
E. Glikman, M. Lacy, S. LaMassa +11
We present a spectroscopically complete sample of 147 infrared-color-selected AGN down to a 22 m flux limit of 20 mJy over the 270 deg of the SDSS Stripe 82 region. M…
Characterisation of the ionosphere above the Murchison Radio Observatory using the Murchison Widefield Array
C. H. Jordan, S. Murray, C. M. Trott +6
We detail new techniques for analysing ionospheric activity, using Epoch of Reionisation (EoR) datasets obtained with the Murchison Widefield Array (MWA), calibrated by the `Real-T…
Djehuty: A Code for Modeling Whole Stars in Three Dimensions
S. Turcotte, G. Bazan, J. Castor +11
The DJEHUTY project is an intensive effort at the Lawrence Livermore National Laboratory (LLNL) to produce a general purpose 3-D stellar structure and evolution code to study dynam…
Carbon Film in Radio Frequency Surface Plasma Source with Cesiation
Vadim Dudnikov, B. Han, S. Murray +5
It is assumed that persistent cesiation in the SNS RF SPS is related to deposition of carbon film on the collar converter. The work function dependence for graphite with alkali dep…
Optical and X-ray observations of the neutron star soft X-ray transient XTE J1709-267
P. G. Jonker, D. K. Galloway, J. E. McClintock +3
We report on the discovery of the optical counterpart to the neutron star soft X-ray transient (SXT) XTE J1709-267 in outburst and quiescence. We further report the detection of ty…
Chandra study of an overdensity of X-ray sources around two distant (z~0.5) clusters
M. Cappi, P. Mazzotta, M. Elvis +21
We present results from a Chandra X-ray Observatory study of the field X-ray source populations in 4 different observations: two high-redshift (z~0.5) clusters of galaxies 3C295 an…
Galaxy clusters and the cosmic cycle of baryons across cosmic times
R. Giacconi, S. Borgani, P. Rosati +18
We discuss the central role played by the X-ray study of hot baryons within galaxy clusters to reconstruct the assembly of cosmic structures and to trace the past history of star f…