C. R. Canizares
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View article: A Multiwavelength View of <i>ρ</i> Oph. I. Resolving the X-Ray Source between A and B
A Multiwavelength View of <i>ρ</i> Oph. I. Resolving the X-Ray Source between A and B Open
We present a multiwavelength analysis of the central stellar pair of ρ Oph components A and B. Using recent high-resolution Chandra X-ray Observatory observations, we demonstrate with high confidence that the dominant X-ray source is ρ Oph…
View article: Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using Its Ionization Response to X-Ray Pulsations
Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using Its Ionization Response to X-Ray Pulsations Open
X-ray binaries are known to launch powerful accretion disk winds that can have a significant impact on the binary systems and their surroundings. To quantify the impact and determine the launching mechanisms of these outflows, we need to m…
View article: The Nature of X-Rays from Young Stellar Objects in the Orion Nebula Cluster—A Chandra HETGS Legacy Project
The Nature of X-Rays from Young Stellar Objects in the Orion Nebula Cluster—A Chandra HETGS Legacy Project Open
The Orion Nebula Cluster (ONC) is the closest site of very young (∼1 Myr) massive star formation The ONC hosts more than 1600 young and X-ray bright stars with masses ranging from ∼0.1–35 M ⊙ . The Chandra HETGS Orion Legacy Project observ…
View article: Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star
Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star Open
High-resolution X-ray spectra of π Aqr, a γ Cas-type star, obtained with the Chandra/HETG spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe; a strong, hard continuum; and a lack of He-like ions, indicating the prese…
View article: The Nature of X-Rays from Young Stellar Objects in the Orion Nebula Cluster -- A Chandra HETGS Legacy Project
The Nature of X-Rays from Young Stellar Objects in the Orion Nebula Cluster -- A Chandra HETGS Legacy Project Open
The Orion Nebula Cluster (ONC) is the closest site of very young ($\sim$ 1 Myrs) massive star formation. The ONC hosts more than 1600 young and X-ray bright stars with masses ranging from $\sim$ 0.1 to 35 $M_\odot$. The Chandra HETGS Orion…
View article: Chandra HETG X-ray Spectra and Variability of $π$ Aqr, a $γ$ Cas-type Be star
Chandra HETG X-ray Spectra and Variability of $π$ Aqr, a $γ$ Cas-type Be star Open
High-resolution X-ray spectra of $π\,$Aqr, a $γ\,$Cas-type star, obtained with the Chandra/HETG grating spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe, a strong, hard continuum, and a lack of He-like ions, indica…
View article: The black hole low mass X-ray binary V404 Cygni is part of a wide hierarchical triple, and formed without a kick
The black hole low mass X-ray binary V404 Cygni is part of a wide hierarchical triple, and formed without a kick Open
Evidence suggests that when compact objects such as black holes and neutron stars form, they may receive a ``natal kick,'' where the stellar remnant gains momentum. Observational evidence for neutron star kicks is substantial, yet limited …
View article: Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using its Ionization Response to X-ray Pulsations
Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using its Ionization Response to X-ray Pulsations Open
X-ray binaries are known to launch powerful accretion disk winds that can have significant impact on the binary systems and their surroundings. To quantify the impact and determine the launching mechanisms of these outflows, we need to mea…
View article: The Si K Edge Gas and Dust Optical Depths Toward the Galactic Bulge
The Si K Edge Gas and Dust Optical Depths Toward the Galactic Bulge Open
Knowledge of the dust content in interstellar matter is important to our understanding of the composition and evolution of the interstellar medium. The Chandra High Energy Transmission Grating (HETG) Spectrometer provides a unique opportun…
View article: The Long Stare at Hercules X-1. I. Emission Lines from the Outer Disk, the Magnetosphere Boundary, and the Accretion Curtain
The Long Stare at Hercules X-1. I. Emission Lines from the Outer Disk, the Magnetosphere Boundary, and the Accretion Curtain Open
Hercules X-1 is a nearly edge-on accreting X-ray pulsar with a warped accretion disk, precessing with a period of about 35 days. The disk precession allows for unique and changing sightlines toward the X-ray source. To investigate the accr…
View article: The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with <i>XMM–Newton, Chandra</i>, and <i>NuSTAR</i>
The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with <i>XMM–Newton, Chandra</i>, and <i>NuSTAR</i> Open
We present results from the major coordinated X-ray observing programme on the ULX NGC 1313 X-1 performed in 2017, combining XMM–Newton, Chandra, and NuSTAR, focusing on the evolution of the broad-band (∼0.3–30.0 keV) continuum emission. C…
View article: Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1
Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1 Open
Ultraluminous X-ray sources (ULXs) provide a unique opportunity to probe the geometry and energetics of super-Eddington accretion. The radiative processes involved in super-Eddington accretion are not well understood, and so studying corre…
View article: Laboratory Astrophysics Needs for X-ray Grating Spectrometers
Laboratory Astrophysics Needs for X-ray Grating Spectrometers Open
New X-ray gratings provide far higher sensitivity and resolution, but to use the capabilities, improvements are needed in measurements of wavelengths, radiative and collisional transition rates, as well as ionization and recombination cros…
View article: Arcus: the soft x-ray grating explorer
Arcus: the soft x-ray grating explorer Open
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. Arcus provides high-resolution soft X-ray spectroscopy in the 12-50 Å bandpass with unprecedented sensitivity, including spectral resolution < 2500 and effec…
View article: Astro 2020: Astromineralogy of interstellar dust with X-ray spectroscopy
Astro 2020: Astromineralogy of interstellar dust with X-ray spectroscopy Open
X-ray absorption fine structure (XAFS) in the 0.2-2 keV band is a crucial component in multi-wavelength studies of dust mineralogy, size, and shape -- parameters that are necessary for interpreting astronomical observations and building ph…
View article: Si K EDGE STRUCTURE AND VARIABILITY IN GALACTIC X-RAY BINARIES
Si K EDGE STRUCTURE AND VARIABILITY IN GALACTIC X-RAY BINARIES Open
We survey the Si K edge structure in various absorbed Galactic low-mass X-ray binaries (LMXBs) to study states of silicon in the inter- and circum-stellar medium. The bulk of these LMXBs lie toward the Galactic bulge region and all have co…
View article: X-RAY PROPERTIES OF LOW-MASS PRE-MAIN SEQUENCE STARS IN THE ORION TRAPEZIUM CLUSTER
X-RAY PROPERTIES OF LOW-MASS PRE-MAIN SEQUENCE STARS IN THE ORION TRAPEZIUM CLUSTER Open
The Chandra High Energy Transmission Gratings (HETG) Orion Legacy Project\n(HOLP) is the first comprehensive set of observations of a very young massive\nstellar cluster which provides high resolution X-ray spectra of very young\nstars ove…