J. C. Raymond
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View article: XRISM Spectroscopy of the Stellar-mass Black Hole GRS 1915+105
XRISM Spectroscopy of the Stellar-mass Black Hole GRS 1915+105 Open
GRS 1915+105 was the stellar-mass black hole that best reproduced key phenomena that are also observed in type 1 active galactic nuclei (AGNs). In recent years, however, it has evolved to resemble a type 2 or Compton-thick AGN. Herein we r…
View article: On the Fe <scp>xxii</scp> Emission in the X-Ray Spectrum of NGC 1068
On the Fe <span>xxii</span> Emission in the X-Ray Spectrum of NGC 1068 Open
The Fe xxii doublet has been previously used to determine the density of collisionally ionized emission from magnetic cataclysmic variable stars. We test how this diagnostic doublet behaves for a photoionized plasma with the spectral energ…
View article: A peculiar white dwarf merger remnant with a rigidly corotating half-ring of circumstellar material
A peculiar white dwarf merger remnant with a rigidly corotating half-ring of circumstellar material Open
In the recent years, the wealth of data on potential double white dwarf merger remnants made available by time-domain surveys like the Zwicky Transient Facility (ZTF), ATLAS, Kepler and TESS, together with spectroscopic counterparts such a…
View article: On the Fe xxii Emission in the X-ray spectrum of NGC 1068
On the Fe xxii Emission in the X-ray spectrum of NGC 1068 Open
The Fe xxii doublet has been previously used to determine the density of collisionally ionized emission from magnetic cataclysmic variable stars. We test how this diagnostic doublet behaves for a photoionized plasma with an active galactic…
View article: Magnetic Atmospheres and Circumstellar Interaction in J1901+1458: Revisiting the Most Compact White Dwarf Merger Remnant in the light of new UV and X-ray data
Magnetic Atmospheres and Circumstellar Interaction in J1901+1458: Revisiting the Most Compact White Dwarf Merger Remnant in the light of new UV and X-ray data Open
Double degenerate white dwarf (WD) mergers can exhibit extreme magnetic fields exceeding $10^{8}$ G and rapid rotation, but their spectral-energy distributions and high-energy emission mechanisms remain poorly characterised. ZTF J1901+1458…
View article: Dialog Concerning the Two Shock Codes
Dialog Concerning the Two Shock Codes Open
In this paper, we summarize the shock physics and the treatment of radiative transfer in two well-established shock codes—the MAPPINGS code and the Cox/Raymond code. We compare the ionization states, temperatures, electron densities, and e…
View article: A 3D Nonequilibrium Ionization Model of a Shock Wave in the Low Corona. I. Extreme-ultraviolet Emission and Inefficient Electron Heating
A 3D Nonequilibrium Ionization Model of a Shock Wave in the Low Corona. I. Extreme-ultraviolet Emission and Inefficient Electron Heating Open
Shocks in the low corona are best observed in the extreme ultraviolet (EUV); however, time-dependent ionization in the postshock region is generally incompatible with the otherwise straightforward plasma diagnostics typically applied to EU…
View article: Modeling of Ionization and Recombination Processes in Plasma with Arbitrary Non-Maxwellian Electron Distribution
Modeling of Ionization and Recombination Processes in Plasma with Arbitrary Non-Maxwellian Electron Distribution Open
In astronomical environments, the high-temperature emission of plasma mainly depends on ion charge states, requiring accurate analysis of the ionization and recombination processes. For various phenomena involving energetic particles, non-…
View article: Dialogue Concerning the Two Shock Codes
Dialogue Concerning the Two Shock Codes Open
In this paper, we summarize the shock physics and the treatment of radiative transfer in two well-established shock codes -- the MAPPINGS code (Dopita1976,Binette1985,Sutherland1993) and the Cox/Raymond code (hereafter CR code) (Cox1972,Ra…
View article: Modeling of Ionization and Recombination Processes in Plasma with Arbitrary Non-Maxwellian Electron Distributions
Modeling of Ionization and Recombination Processes in Plasma with Arbitrary Non-Maxwellian Electron Distributions Open
In astronomical environments, the high-temperature emission of plasma mainly depends on ion charge states, which requires accurate analysis of the ionization and recombination processes. For various phenomena involving energetic particles,…
View article: Cassiopeia A’s Reverse Shock and Its Effects on the Expanding SN Ejecta*
Cassiopeia A’s Reverse Shock and Its Effects on the Expanding SN Ejecta* Open
Using optical and near-infrared images of the Cassiopeia A (Cas A) supernova remnant covering the time period 1951–2022, together with optical spectra of selected filaments, we present an investigation of Cas A’s reverse shock velocity and…
View article: Dust Destruction in Shock Waves in the Cygnus Loop
Dust Destruction in Shock Waves in the Cygnus Loop Open
Supernova remnant (SNR) shock waves are known to be important sources of dust destruction in the interstellar medium. Models of dust destruction in shocks have made various predictions of the destruction efficiency, but have generally been…
View article: Spectroscopy of Supernova Remnants and Candidates in M31
Spectroscopy of Supernova Remnants and Candidates in M31 Open
With a star formation rate of order 0.4 M ⊙ yr −1 , M31 should have a significant population of supernova remnants (SNRs) and, in fact, 156 SNRs and SNR candidates have been suggested by J. H. Lee & M. G. Lee, by searching for nebulae with…
View article: Differentiating the Acceleration Mechanisms in the Slow and Alfvénic Slow Solar Wind
Differentiating the Acceleration Mechanisms in the Slow and Alfvénic Slow Solar Wind Open
In the corona, plasma is accelerated to hundreds of kilometers per second and heated to temperatures hundreds of times hotter than the Sun's surface before it escapes to form the solar wind. Decades of space-based experiments have shown th…
View article: Cassiopeia A's Reverse Shock and its Effects on the Expanding SN Ejecta
Cassiopeia A's Reverse Shock and its Effects on the Expanding SN Ejecta Open
Using optical and near-infrared images of the Cassiopeia A (Cas A) supernova remnant covering the time period 1951 to 2022, together with optical spectra of selected filaments, we present an investigation of Cas A's reverse shock velocity …
View article: Differentiating the acceleration mechanisms in the slow and Alfvénic slow solar wind
Differentiating the acceleration mechanisms in the slow and Alfvénic slow solar wind Open
In the corona, plasma is accelerated to hundreds of kilometers per second, and heated to temperatures hundreds of times hotter than the Sun's surface, before it escapes to form the solar wind. Decades of space-based experiments have shown …
View article: CYGNUS LOOP OBSERVATIONS WITH BTA/SCORPIO-2
CYGNUS LOOP OBSERVATIONS WITH BTA/SCORPIO-2 Open
We present Fabry-Pérot interferometric observations of the northeastern shock filaments in the Cygnus Loop supernova remnant. These observations were obtained using the SCORPIO-2 spectrograph (Spectral Camera with Optical Reducer for Photo…
View article: The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions
The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions Open
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images—hence dubbed the Green Monster—that stretches acros…
View article: Expansion Properties of the Young Supernova Type Iax Remnant Pa 30 Revealed
Expansion Properties of the Young Supernova Type Iax Remnant Pa 30 Revealed Open
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants. In particular, Pa 30 exhi…
View article: Expansion properties of the young supernova type Iax remnant Pa 30 revealed
Expansion properties of the young supernova type Iax remnant Pa 30 revealed Open
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants. In particular, Pa 30 exhi…
View article: The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions
The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions Open
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images - hence dubbed the Green Monster - that stretches a…
View article: Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST Open
We present JWST NIRCam (F356W and F444W filters) and MIRI (F770W) images and NIRSpec Integral Field Unit (IFU) spectroscopy of the young Galactic supernova remnant Cassiopeia A (Cas A) to probe the physical conditions for molecular CO form…
View article: Absorption in the Spectrum of a Background AGN by C ii* by the Supernova Remnant G354-33
Absorption in the Spectrum of a Background AGN by C ii* by the Supernova Remnant G354-33 Open
A number of very large, very faint supernova remnants (SNRs) have been discovered in the past few years. Those in the Galactic halo occur in low density gas, so they might be more easily observed in absorption than in emission. The SNR G35…
View article: Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST Open
We present JWST NIRCam (F356W and F444W filters) and MIRI (F770W) images and NIRSpec- IFU spectroscopy of the young supernova remnant Cassiopeia A (Cas A). We obtained the data as part of a JWST survey of Cas A. The NIRCam and MIRI images …
View article: Dissecting the Crab Nebula with JWST: Pulsar Wind, Dusty Filaments, and Ni/Fe Abundance Constraints on the Explosion Mechanism
Dissecting the Crab Nebula with JWST: Pulsar Wind, Dusty Filaments, and Ni/Fe Abundance Constraints on the Explosion Mechanism Open
We present JWST observations of the Crab Nebula, the iconic remnant of the historical SN 1054. The observations include NIRCam and MIRI imaging mosaics plus MIRI/MRS spectra that probe two select locations within the ejecta filaments. We d…
View article: The Distance to the S147 Supernova Remnant
The Distance to the S147 Supernova Remnant Open
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 Gaia data with wide-field, multifiber echelle spectroscopy…
View article: Dissecting the Crab Nebula with JWST: Pulsar wind, dusty filaments, and Ni/Fe abundance constraints on the explosion mechanism
Dissecting the Crab Nebula with JWST: Pulsar wind, dusty filaments, and Ni/Fe abundance constraints on the explosion mechanism Open
We present JWST observations of the Crab Nebula, the iconic remnant of the historical SN 1054. The observations include NIRCam and MIRI imaging mosaics, plus MIRI/MRS IFU spectra that probe two select locations within the ejecta filaments.…
View article: A JWST Survey of the Supernova Remnant Cassiopeia A
A JWST Survey of the Supernova Remnant Cassiopeia A Open
We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up of NIRCam and MIRI imaging mosaics that map emission from the main shell, in…
View article: The Distance to the S147 Supernova Remnant
The Distance to the S147 Supernova Remnant Open
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 Gaia data with wide field, multi-fiber echelle spectroscop…
View article: Examining the Coronal Source and Inner Heliospheric Evolution of a Stream Sampled by Parker Solar Probe and Solar Orbiter
Examining the Coronal Source and Inner Heliospheric Evolution of a Stream Sampled by Parker Solar Probe and Solar Orbiter Open
With the growing number of solar probes across the inner heliosphere, our community, now more than ever, is well placed to continuously track the formation and supersonic expansion of the solar wind from the Sun. To capture the conditions …