Publications (50)
Dust Destruction in Fast Shocks of Core-Collapse Supernova Remnants in the Large Magellanic Cloud
Brian J. Williams, K. J. Borkowski, S. P. Reynolds +9
We report observations with the MIPS instrument aboard the {\it Spitzer Space Telescope} (SST) of four supernova remnants (SNRs) believed to be the result of core-collapse SNe: N13…
Testing the cooling flow model in the intermediate polar EX Hydrae
G. J. M. Luna, J. C. Raymond, N. S. Brickhouse +3
We use the best available X-ray data from the intermediate polar EX Hydrae to study the cooling-flow model often applied to interpret the X-ray spectra of these accreting magnetic…
Photoionized Lines in the X-ray Spectra of SMC X-1
S. D. Vrtilek, J. C. Raymond, B. S. Boroson +1
We present a detailed spectral analysis of Chandra/ACIS-S CC mode observations of the massive X-ray binary system SMC X-1. The system was observed during both the high and low X-ra…
The Coronal Physics Investigator (CPI) Experiment for ISS: A New Vision for Understanding Solar Wind Acceleration
J. L. Kohl, S. R. Cranmer, J. C. Raymond +9
In February 2011 we proposed a NASA Explorer Mission of Opportunity program to develop and operate a large-aperture ultraviolet coronagraph spectrometer called the Coronal Physics…
Modeling magnetohydrodynamics and non equilibrium SoHO/UVCS line emission of CME shocks
P. Pagano, J. C. Raymond, F. Reale +1
We provide a guideline to interpret the UVCS emission lines (in particular O VI and Si XII) during shock wave propagation in the outer solar corona. We use a numerical MHD model pe…
A deep, multi-epoch Chandra HETG study of the ionized outflow from NGC 4051
A. Ogorzalek, A. L. King, S. W. Allen +2
Actively accreting supermassive black holes significantly impact the evolution of their host galaxies, truncating further star formation by expelling large fractions of gas with wi…
The Distance to the S147 Supernova Remnant
C. S. Kochanek, J. C. Raymond, N. Caldwell
In the absence of a parallax distance to a pulsar or a surviving binary in a supernova remnant (SNR), distances to Galactic SNRs are generally very uncertain. However, by combining…
Carbon, Helium and Proton Kinetic Temperatures in a Cygnus Loop Shock Wave
J. C. Raymond, R. J. Edgar, P. Ghavamian +1
Observations of SN1006 have shown that ions and electrons in the plasma behind fast supernova remnant shock waves are far from equilibrium, with the electron temperature much lower…
FUSE Observations of the Dwarf Nova SW UMa During Quiescence
M. S. Povich, J. C. Raymond, A. Lobel +1
We present spectroscopic observations of the short-period cataclysmic variable SW Ursa Majoris, obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite while the sy…
The Temperature and Ionization of Unshocked Ejecta in Cas A
J. C. Raymond, B. -C. Koo, Y. -H. Lee +3
The supernova remnant Cassiopeia A (Cas A) is one of the few remnants in which it is possible to observe unshocked ejecta. A deep 1.64 micron image of Cas A shows a patch of diffus…
A cosmic-ray precursor model for a Balmer-dominated shock in Tycho's supernova remnant
A. Y. Wagner, J. -J. Lee, J. C. Raymond +2
We present a time-dependent cosmic-ray modified shock model for which the calculated H-alpha emissivity profile agrees well with the H-alpha flux increase ahead of the Balmer-domin…
Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies?
A. S. Wilson, J. C. Raymond
We consider a model in which the narrow line regions (NLRs) of Seyfert galaxies are photoionized ``in situ'' by fast (300 -- 1,000 km/s), radiative shock waves driven into the inte…
Spitzer IRS Observations of the XA Region in the Cygnus Loop Supernova Remnant
R. Sankrit, J. C. Raymond, M. Bautista +5
We report on spectra of two positions in the XA region of the Cygnus Loop supernova remnant obtained with the InfraRed Spectrograph on the Spitzer Space Telescope. The spectra span…
Morphology and density of post-CME current sheets
B. VrÅ¡nak, G. Poletto, E. VujiÄ +11
Eruption of a coronal mass ejection (CME) drags and "opens" the coronal magnetic field, presumably leading to the formation of a large-scale current sheet and the field relaxation…
Ultraviolet spectroscopy of narrow coronal mass ejections
D. Dobrzycka, J. C. Raymond, D. A. Biesecker +2
We present Ultraviolet Coronagraph Spectrometer (UVCS) observations of 5 narrow coronal mass ejections (CMEs) that were among 15 narrow CMEs originally selected by Gilbert et al. (…
The Solar Corona as probed by Comet Lovejoy (C/2011 W3)
J. C. Raymond, P. I. McCauley, S. R. Cranmer +1
EUV images of Comet Lovejoy (C/2011 W3) from the AIA show striations related to the magnetic field structure in both open and closed magnetic regions. The brightness contrast impli…
Plasma Heating During a Coronal Mass Ejection Observed by SOHO
N. A. Murphy, J. C. Raymond, K. E. Korreck
We perform a time-dependent ionization analysis to constrain plasma heating requirements during a fast partial halo coronal mass ejection (CME) observed on 2000 June 28 by the Ultr…
The pre-shock gas of SN1006 from HST/ACS observations
J. C. Raymond, K. E. Korreck, Q. C. Sedlacek +3
We derive the pre-shock density and scale length along the line of sight for the collisionless shock from a deep HST image that resolves the H alpha filament in SN1006 and updated…
Collisionless shocks in partly ionized plasma with cosmic rays: microphysics of non-thermal components
A. M. Bykov, M. A. Malkov, J. C. Raymond +2
In this review we discuss some observational aspects and theoretical models of astrophysical collisionless shocks in partly ionized plasma with the presence of non-thermal componen…
Photoionized features in the X-ray spectrum of EX Hydrae
G. J. M. Luna, J. C. Raymond, N. S. Brickhouse +4
We present the first results from a long (496 ks) Chandra High Energy Transmission Grating observation of the intermediate polar EX Hydrae. In addition to the narrow emission lines…
A Precessing Jet in the CH Cyg Symbiotic System
M. Karovska, T. J. Gaetz, C. L. Carilli +3
Jets have been detected in only a few symbiotic binaries to date, and CH Cyg is one of them. In 2001, a non-relativistic jet was detected in CH Cyg for the first time in X-rays. We…
Discovery of Outlying, High-Velocity Oxygen-Rich Ejecta in Cassiopeia A
R. A. Fesen, M. C. Hammell, J. Morse +7
Hubble Space Telescope images of the young Galactic supernova remnant Cassiopeia A reveal a far larger population of outlying, high-velocity knots of ejecta with a broader range of…
Transition Region Emission and Energy Input to Thermal Plasma During the Impulsive Phase of Solar Flares
J. C. Raymond, G. Holman, A. Ciaravella +3
The energy released in a solar flare is partitioned between thermal and non-thermal particle energy and lost to thermal conduction and radiation over a broad range of wavelengths.…
Intermediate- and High-Velocity Ionized Gas toward zeta Orionis
D. E. Welty, E. B. Jenkins, J. C. Raymond +2
We combine UV spectra obtained with the HST/GHRS echelle, IMAPS, and Copernicus to study the abundances and physical conditions in the predominantly ionized gas seen at high (-105…
Wide Integral-Field Infrared Spectroscopy of the Bright [Fe II] Shell in the Young Supernova Remnant G11.2-0.3
Ho-Gyu Lee, Dae-Sik Moon, Bon-Chul Koo +9
We present the results of wide integral-field near-infrared (1.0-1.8 um) spectroscopic observations of the southeastern shell of the young core-collapse supernova remnant (SNR) G11…
Asymmetric Magnetic Reconnection in Solar Flare and Coronal Mass Ejection Current Sheets
N. A. Murphy, M. P. Miralles, C. L. Pope +6
We present two-dimensional resistive magnetohydrodynamic simulations of line-tied asymmetric magnetic reconnection in the context of solar flare and coronal mass ejection current s…
Chemical enrichment of the complex hot ISM of the Antennae Galaxies: II. Physical properties of the hot gas and supernova feedback
A. Baldi, J. C. Raymond, G. Fabbiano +5
We investigate the physical properties of the interstellar medium (ISM) in the merging pair of galaxies known as The Antennae (NGC 4038/39), using the deep coadded ~411 ks Chandra…
On the properties of thermal disk winds in X-ray transient sources: a case study of GRO J1655-40
S. Luketic, D. Proga, T. R. Kallman +2
We present the results of hydrodynamical simulations of the disk photosphere irradiated by strong X-rays produced in the inner most part of the disk. As expected, the irradiation h…
Dust-driven streaming instability and magnetic field amplification downstream of supernova remnant shocks
S. Gabici, J. C. Raymond, A. Ciardi +3
The acceleration of cosmic rays up to PeV energies at supernova remnant shocks requires an amplification of the ambient magnetic field. The amplification mechanism must operate ups…
Transition Region Emission from Solar Flares during the Impulsive Phase
H. Johnson, J. C. Raymond, N. A. Murphy +4
There are relatively few observations of UV emission during the impulsive phases of solar flares, so the nature of that emission is poorly known. Photons produced by solar flares c…
Three Dimensional Structure and Energy Balance of a Coronal Mass Ejection
J. -Y. Lee, J. C. Raymond, Y. -K. Ko +1
The Ultraviolet Coronagraph Spectrometer (UVCS) observed Doppler shifted material of a partial Halo Coronal Mass Ejection (CME) on December 13 2001. The observed ratio of [O V]/O V…
X-ray Line Emission from Evaporating and Condensing Accretion Disk Atmospheres
M. A. Jimenez-Garate, J. C. Raymond, D. A. Liedahl +1
We model the X-rays reprocessed by an accretion disk in a fiducial low-mass X-ray binary system with a neutron star primary. An atmosphere, or the intermediate region between the o…
The Role of Turbulence in Coronal Heating and Solar Wind Expansion
S. R. Cranmer, M. Asgari-Targhi, M. P. Miralles +4
Plasma in the Sun's hot corona expands into the heliosphere as a supersonic and highly magnetized solar wind. This paper provides an overview of our current understanding of how th…
Bright Ray-like Features in the Aftermath of CMEs: White Light vs UV Spectra
A. Ciaravella, D. F. Webb, S. Giordano +1
Current sheets are important signatures of magnetic reconnection in the eruption of confined solar magnetic structures. Models of Coronal Mass Ejections (CMEs) involve formation of…
Ultraviolet Observations of Comet 96/P Machholz at Perihelion
J. C. Raymond, S. Giordano, S. Mancuso +2
Ultraviolet spectra of Comet 96/P Machholz were obtained during its 2002 perihelion with the UVCS instrument aboard the SOHO satellite. Emission from H I, C II, C III, and O I, is…
CH Cyg X-ray Jet Activity and Multi-component Structures
M. Karovska, C. L. Carilli, J. C. Raymond +1
In this paper we report detection of multiple component structures in a Chandra X-ray image obtained in March 2001 of the nearby symbiotic interacting binary system CH Cyg. These c…
HST-STIS Observations of the Cygnus Loop: Spatial Structure of a Non-radiative Shock
Ravi Sankrit, W. P. Blair, J. C. Raymond +1
We present a spatially-resolved ultraviolet spectrum of a non-radiative shock front in the Cygnus Loop, obtained with the Space Telescope Imaging Spectrograph (STIS) on board the H…
The solar wind charge-transfer X-ray emission in the 1/4 keV energy range: inferences on Local Bubble hot gas at low Z
D. Koutroumpa, R. Lallement, J. C. Raymond +1
We present calculations of the heliospheric SWCX emission spectra and their contributions in the ROSAT 1/4 keV band. We compare our results with the soft X-ray diffuse background (…
Observational signatures of particle acceleration in supernova remnants
E. A. Helder, J. Vink, A. M. Bykov +3
We evaluate the current status of supernova remnants as the sources of Galactic cosmic rays. We summarize observations of supernova remnants, covering the whole electromagnetic spe…
Non-Maxwellian Proton Velocity Distributions in Nonradiative Shocks
J. C. Raymond, Philip A. Isenberg, J. M. Laming
The Balmer line profiles of nonradiative supernova remnant shocks provide the means to measure the post-shock proton velocity distribution. While most analyses assume a Maxwellian…
The Structure and X-ray Recombination Emission of a Centrally Illuminated Accretion Disk Atmosphere and Corona
M. A. Jimenez-Garate, J. C. Raymond, D. A. Liedahl
We model an accretion disk atmosphere and corona photoionized by a central X-ray continuum source. We calculate the opacity and radiation transfer for an array of disk radii, to ob…
The ROSAT-HRI X-Ray Survey of the Cygnus Loop
N. A. Levenson, J. R. Graham, B. Aschenbach +13
We describe and report progress on the joint U.S. and German campaign to map the X-ray emission from the entire Cygnus Loop supernova remnant with the ROSAT High Resolution Imager.…
FUSE Observation of the Non-Radiative Collisionless Shock in the Remnant of SN1006
K. E. Korreck, J. C. Raymond, T. H. Zurbuchen +1
The appearance of the young supernova remnant SN1006 is dominated by emission from non-radiative shocks in the NE and NW regions. At X-ray energies the northeast shock exhibits pre…
Chemical enrichment of the complex hot ISM of the Antennae galaxies: I. Spatial and spectral analysis of the diffuse X-ray emission
A. Baldi, J. C. Raymond, G. Fabbiano +5
We present an analysis of the properties of the hot interstellar medium (ISM) in the merging pair of galaxies known as The Antennae (NGC 4038/39), performed using the deep, coadded…
Ultraviolet Coronagraph Spectroscopy: A Key Capability for Understanding the Physics of Solar Wind Acceleration
S. R. Cranmer, J. L. Kohl, D. Alexander +21
Understanding the physical processes responsible for accelerating the solar wind requires detailed measurements of the collisionless plasma in the extended solar corona. Some key c…
The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant
R. A. Fesen, M. C. Hammell, J. Morse +7
HST ACS images of the young SN remnant Cas A are used to explore the expansion and spatial distribution of its highest velocity debris. Proper motions of over 1800 outlying ejecta…
Simultaneous ASCA and HST/GHRS observations of Cygnus X-2/V1341 Cygni
S. D. Vrtilek, J. C. Raymond, B. Boroson +4
We present results from ultraviolet and X-ray observations of the low mass X-ray binary Cygnus X-2. The simultaneous HST/GHRS and ASCA observations took place during the low state…
An Isolated, Recently Shocked ISM Cloud in the Cygnus Loop SNR
D. J. Patnaude, R. A. Fesen, J. C. Raymond +3
Spatially resolved ROSAT X-ray and ground-based optical data for the southwestern region of the Cygnus Loop SNR reveal in unprecedented detail the very early stages of a blast wave…
Far UV Spectra of Fast Coronal Mass Ejections Associated with X-class Flares
J. C. Raymond, A. Ciaravella, D. Dobrzycka +4
The Ultraviolet Coronagraph Spectrometer (UVCS) aboard the {\it SOHO} satellite has observed very fast Coronal Mass Ejections (CMEs) associated with X-class flares. These events sh…
Simulating Radiative Magnetohydrodynamical Flows with AstroBEAR: Implementation and Applications of Non-equilibrium Cooling
E. C. Hansen, P. Hartigan, A. Frank. A. Wright +1
Radiative cooling plays a crucial role in the dynamics of many astrophysical flows, and is particularly important in the dense shocked gas within Herbig-Haro (HH) objects and stell…