Circumstellar Shells in Absorption in Type Ia Supernovae (2009)
Borkowski, K. J., Blondin, J. M., Reynolds, S. P.
Progenitors of Type Ia supernovae (SNe) have been predicted to modify their ambient circumstellar (CSM) and interstellar environments through the action of their powerful winds. While there is X-ray...
The radio expansion and brightening of the very young supernova remnant G1.9+0.3 (2008)
Green, D. A., Reynolds, S. P., Borkowski, K. J., Hwang, U., Harrus, I., Petre, R.
Recent radio observations of the small Galactic supernova remnant G1.9+0.3 made at 4.86 GHz with the VLA are presented, and compared with earlier observations at 1.49 GHz which have a comparable...
The Youngest Galactic Supernova Remnant: G1.9+0.3 (2008)
Reynolds, S. P., Borkowski, K. J., Green, D. A., Hwang, U., Harrus, I., Petre, R.
Our 50 ks Chandra observation of the small radio supernova remnant (SNR) G1.9+0.3 shows a complete shell structure with strong bilateral symmetry, about $100''$ in diameter. The radio morphology is...
NONEQUILIBRIUM IONIZATION MODELS FOR ANALYSIS OF X-RAY SPECTRA OF SUPERNOVA REMNANTS (2007)
Las remanentes de supernova (SNRs) son de los objetos más brillantes en rayos-X que serán observados por los nuevos satélites de rayos-X (Chandra, XMM y Astro-E). La emisión térmica de las SNRs...
NONEQUILIBRIUM IONIZATION MODELS FOR ANALYSIS OF X-RAY SPECTRA OF SUPERNOVA REMNANTS (2007)
Las remanentes de supernova (SNRs) son de los objetos mas brillantes en rayos-X que seran observados por los nuevos satelites de rayos-X (Chandra, XMM y Astro-E). La emision termica de las SNRs no...
Reynolds, S. P., Borkowski, K. J., Hwang, U., Hughes, J. P., Badenes, C., Laming, J. M., ...
We present initial results of a 750 ks Chandra observation of the remnant of Kepler's supernova of AD 1604. The strength and prominence of iron emission, together with the absence of O-rich ejecta,...
Observations of X-rays and Thermal Dust Emission from the Supernova Remnant Kes 75 (2007)
Morton, T. D., Slane, P., Borkowski, K. J., Reynolds, S. P., Helfand, D. J., Gaensler, B. M., ...
We present Spitzer Space Telescope and Chandra X-ray Observatory observations of the composite Galactic supernova remnant Kes 75 (G29.7-0.3). We use the detected flux at 24 microns and hot gas...
A New Young Galactic Supernova Remnant Containing a Compact Object: G15.9+0.2 (2006)
Reynolds, S. P., Borkowski, K. J., Hwang, U., Harrus, I., Petre, R., Dubner, G.
We identify the radio-emitting shell-type supernova remnant G15.9+0.2 as a relatively young remnant containing an X-ray point source that may be its associated neutron star. The integrated spectrum...
Williams, Brian J., Borkowski, K. J., Reynolds, S. P., Blair, W. P., Ghavamian, P., Hendrick, S. P., ...
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: N132D (0525-69.6),...
Borkowski, K. J., Hendrick, S. P., Reynolds, S. P.
We present observations of two LMC supernova remnants (SNRs), DEM L238 and DEM L249, with the Chandra and XMM-Newton X-ray satellites. Bright central emission, surrounded by a faint shell, is present...
Nonequilibrium ionization models for analysis of x-ray spectra of supernova remnants (2006)
Nonequilibrium ionization models for analysis of x-ray spectra of supernova remnants
The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant (2006)
Fesen, R. A., Hammell, M. C., Morse, J., Chevalier, R. A., Borkowski, K. J., Dopita, M. A., ...
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 knots are reported....
Discovery of the X-ray Counterpart to the Rotating Radio Transient J1819--1458 (2005)
Reynolds, S. P., Borkowski, K. J., Gaensler, B. M., Rea, N., McLaughlin, M., Possenti, A., ...
We present the discovery of the first X-ray counterpart to a Rotating RAdio Transient (RRAT) source. RRAT J1819--1458 is a relatively highly magnetized (B $\sim 5\times10^{13}$ G) member of a new...
Discovery of Outlying, High-Velocity Oxygen-Rich Ejecta in Cassiopeia A (2005)
Fesen, R. A., Hammell, M. C., Morse, J., Chevalier, R. A., Borkowski, K. J., Dopita, M. A., ...
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 chemical...
Exploring the Physics of Type Ia Supernovae Through the X-ray Spectra of their Remnants (2005)
Badenes, C., Borkowski, K. J., Bravo, E., Hughes, J. P., Hwang, U.
We present the results of an ongoing project to use the X-ray observations of Type Ia Supernova Remnants to constrain the physical processes involved in Type Ia Supernova explosions. We use the Tycho...
Chandra Observations of Shock Kinematics in Supernova Remnant 1987A (2005)
Zhekov, S. A., McCray, R., Borkowski, K. J., Burrows, D. N., Park, S.
We report the first results from deep X-ray observations of the SNR 1987A with the Chandra LETG. Temperatures inferred from line ratios range from 0.1 - 2 keV and increase with ionization potential....
Badenes, C., Borkowski, K. J., Bravo, E.
The supernova remnants left behind by Type Ia supernovae provide an excellent opportunity for the study of these enigmatic objects. In a previous work, we showed that it is possible to use the X-ray...
ROSAT/ASCA observations of the mixed-morphology supernova remnant W28 (2004)
We present three sets of ROSAT PSPC and four sets of ASCA observations of the supernova remnant (SNR) W28. The overall shape of x-ray emission in W28 is elliptical, dominated by a...
X-ray synchronization emitting Fe-rich ejecta in SNR RCW 86 (2004)
Rho, J., Dyer, K. K., Borkowski, K. J., Reynolds, S. P.
Supernova remnants may exhibit both thermal and nonthermal X-ray emission. In a previous study with ASCA data, we found that the middle-aged supernova remnant RCW 86 showed evidence for both...
Dyer, K. K., Reynolds, S. P., Borkowski, K. J.
We present a spatially resolved spectral analysis of full ASCA observations of the remnant of the supernova of 1006 AD. This remnant shows both nonthermal X-ray emission from bright limbs, generally...
Discovery of a New Pulsar Wind Nebula in the Large Magellanic Cloud (2003)
Gaensler, B. M., Hendrick, S. P., Reynolds, S. P., Borkowski, K. J.
We present new high-resolution radio and X-ray observations of the supernova remnant (SNR) B0453-685 in the Large Magellanic Cloud, carried out with the Australia Telescope Compact Array and the...
Separating Thermal and Nonthermal X-Rays in Supernova Remnants I: Total Fits to SN 1006 AD (2000)
Dyer, K. K., Reynolds, S. P., Borkowski, K. J., Allen, G. E., Petre, R.
The remnant of SN 1006 has an X-ray spectrum dominated by nonthermal emission, and pre-ASCA observations were well described by a synchrotron calculation with electron energies limited by escape. We...
Kinematics of 1200 km/s Jets in He 3-1475 (2000)
Borkowski, K. J., Harrington, J. P.
Spectroscopic observations of a proto-planetary nebula He 3-1475 with the Space Telescope Imaging Spectrograph (STIS) reveal the kinematics of its high (1200 km/s) velocity jets. The jets are formed...
Dynamics of Fe-Ni Bubbles in Young Supernova Remnants (2000)
Blondin, J. M., Borkowski, K. J., Reynolds, S. P.
Observations of core-collapse supernovae (SNe) have revealed the presence of extensive mixing of radioactive material in SN ejecta. The mixing of radioactive material, mostly freshly synthesized Ni,...
Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission (2000)
Borkowski, K. J., Lyerly, W. J., Reynolds, S. P.
Improved calculations of X-ray spectra for supernova remnants (SNRs) in the Sedov-Taylor phase are reported, which for the first time include reliable atomic data for Fe L-shell lines. This new set...
A Broadband X-Ray Study of the Supernova Remnant 3C 397 (2000)
Safi-Harb, S., Petre, R., Arnaud, K. A., Keohane, J. W., Borkowski, K. J., Dyer, K. K., ...
We present an X-ray study of the radio bright supernova remnant (SNR) 3C 397 with ROSAT, ASCA, and RXTE. A central X-ray spot seen with the ROSAT High-Resolution Imager hints at the presence of a...
Thermal and Nonthermal X-Ray Emission in SNR RCW 86 (2000)
Borkowski, K. J., Rho, J., Reynolds, S. P., Dyer, K. K.
Supernova remnants may exhibit both thermal and nonthermal X-ray emission. Such remnants can be distinguished by the weakness of their X-ray lines, because of the presence of a strong nonthermal...
New Models for X-Ray Synchrotron Radiation from the Remnant of Supernova 1006 AD (2000)
Dyer, K. K., Reynolds, S. P., Borkowski, K. J.
Galactic cosmic rays up to energies of around 10^15 eV are assumed to originate in supernova remnants (SNRs). The shock wave of a young SNR like SN 1006 AD can accelerate electrons to energies...
Nonequilibrium ionization models for analysis of x-ray spectra of supernova remnants (2000)
Among the brightest sources of X-ray emission are supernova remnants (SNRs), which will be extensively observed by new X-ray satellites (Chandra, XMM, and Astro-E). Thermal X-ray emission from SNRs...