Hopkins Ultraviolet Telescope Observations of Her X-1 (2009)
Bram Boroson, William P. Blair, Arthur F. Davidsen, S. D. Vrtilek, John Raymond, Knox S. Long, ...
We have obtained a far-ultraviolet spectrum of the X-ray binary Hercules X-1/HZ Herculis using the Hopkins Ultraviolet Telescope aboard the Astro-1 space shuttle mission in 1990 December. This is the...
X-ray Evolution of SNR 1987A: The Radial Expansion (2009)
Racusin, Judith L., Park, Sangwook, Zhekov, Svetozar, Burrows, David N., Garmire, Gordon P., McCray, Richard
We present the evolution of the radial expansion of SNR 1987A as measured using Chandra X-ray observations taken over the last 10 years. To characterize the complex structure of the remnant and...
High-Resolution X-ray Spectroscopy of SNR 1987A: Chandra LETG and HETG Observations in 2007 (2008)
Zhekov, Svetozar A., McCray, Richard, Dewey, Daniel, Canizares, Claude R., Borkowski, Kazimierz J., Burrows, David N., ...
We present an extended analysis of the deep Chandra LETG and HETG observations of the supernova remnant 1987A (SNR 1987A) carried out in 2007. The global fits to the grating spectra show that the...
Spatial Structure and Collisionless Electron Heating in Balmer-dominated Shocks (2008)
Van Adelsberg, Matthew, Heng, Kevin, McCray, Richard, Raymond, John C.
Balmer-dominated shocks in supernova remnants (SNRs) produce strong hydrogen lines with a two-component profile composed of a narrow contribution from cold upstream hydrogen atoms, and a broad...
Shell-shocked diffusion model for the light curve of SN2006gy (2007)
Smith, Nathan, McCray, Richard
We explore a simple model for the high luminosity of SN 2006gy involving photon diffusion of shock-deposited thermal energy. The distinguishing property of the model is that the large ``stellar''...
High Resolution Spectroscopy of SN1987A's Rings: He I 10830 and H-alpha from the Hotspots (2007)
Smith, Nathan, McCray, Richard
We present the first high-dispersion spectroscopy of He I 10830 from the hotspots in the ring around SN1987A, obtained at Gemini South, spatially resolving the near and far sides of the ring. We...
The Transition Zone in Balmer-Dominated Shocks (2007)
Heng, Kevin, Van Adelsberg, Matthew, McCray, Richard, Raymond, John C.
We examine the structure of the post-shock region in supernova remnants (SNRs). The ``shock transition zone'' is set up by charge transfer and ionization events between atoms and ions, and has a...
Chandra Observations of Supernova 1987A (2007)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., McCray, Richard, Racusin, Judith L., Zhekov, Svetozar A.
We have been monitoring Supernova (SN) 1987A with {\it Chandra X-Ray Observatory} since 1999. We present a review of previous results from our {\it Chandra} observations, and some preliminary results...
The transition zone in Balmer-dominated shocks (2007)
Heng, Kevin, Van Adelsberg, Matthew, McCray, Richard, Raymond, John C.
Balmer-Dominated Shocks Revisited (2006)
We present a new formalism to describe the ratios and profiles of emission lines from hydrogen in Balmer-dominated shocks. We use this model to interpret the measured widths and ratios of broad and...
Evolutionary Status of SNR 1987A at the Age of Eighteen (2006)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Garmire, Gordon P., Racusin, Judith L., McCray, Richard
$\sim$18 yr after the supernova explosion, the blast wave of SNR 1987A is entering the main body of the equatorial circumstellar material, which is causing a dramatic brightening of the remnant. We...
Chandra LETG Observations of Supernova Remnant 1987A (2006)
Zhekov, Svetozar A., McCray, Richard, Borkowski, Kazimierz J., Burrows, David N., Park, Sangwook
We discuss the results from deep Chandra LETG observations of the supernova remnant 1987A (SNR 1987A). We find that a distribution of shocks, spanning the same range of velocities (from 300 to 1700...
Evolution of the Reverse Shock Emission from SNR 1987A (2006)
Heng, Kevin, McCray, Richard, Zhekov, Svetozar A., Challis, Peter M., Chevalier, Roger A., Crotts, Arlin P. S., ...
We present new (2004 July) G750L and G140L Space Telescope Imaging Spectrograph (STIS) data of the H-alpha and Ly-alpha emission from supernova remnant (SNR) 1987A. With the aid of earlier data, from...
Supernova Remnant 1987A: High Resolution Images and Spectrum from Chandra Observations (2005)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Racusin, Judith L., McCray, Richard, Borkowski, Kazimierz J.
We report on the morphological and spectral evolution of SNR 1987A from the monitoring observations with the Chandra/ACIS. As of 2005, the X-ray-bright lobes are continuously brightening and...
The reverse shock of SNR1987A at 18 years after outburst (2005)
Smith, Nathan, Zhekov, Svetozar A., Heng, Kevin, McCray, Richard, Morse, Jon A., Gladders, Mike
We use low-dispersion spectra obtained at the Magellan Observatory to study the broad H-alpha emission from the reverse shock of the infant supernova remnant SNR1987A. These spectra demonstrate that...
Supernova Remnant 1987A: Opening the Future by Reaching the Past (2005)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., McCray, Richard
We report an up-turn in the soft X-ray light curve of supernova remnant (SNR) 1987A in late 2003 (~6200 days after the explosion), as observed with the Chandra X-ray Observatory. Since early 2004,...
A Chandra View of The Morphological And Spectral Evolution of Supernova Remnant 1987A (2004)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Garmire, Gordon P., McCray, Richard
We present an update on the results of our monitoring observations of the X-ray remnant of supernova (SN) 1987A with the {\it Chandra X-Ray Observatory}. As of 2002 December, we have performed a...
Pun, Chun S. J., Michael, Eli, Zhekov, Svetozar A., McCray, Richard, Garnavich, Peter M., Challis, Peter M., ...
We report and interpret HST/STIS long-slit observations of the optical and ultraviolet (1150 - 10270 Angstrom) emission-line spectra of the rapidly brightening Spot 1 on the equatorial ring of SN...
X-ray spectrum of supernova remnant 1987A (2002)
Michael, Eli, Zhekov, Svetozar, McCray, Richard, Hwang, Una, Burrows, David N., Park, Sangwook, ...
We discuss the X-ray emission observed from supernova remnant 1987A with the Chandra X-Ray Observatory. We analyze a high- resolution spectrum obtained in 1999 October with the high- energy...
The X-ray Spectrum of Supernova Remnant 1987A (2001)
Michael, Eli, Zhekov, Svetozar, McCray, Richard, Hwang, Una, Burrows, David N., Park, Sangwook, ...
We discuss the X-ray emission observed from Supernova Remnant 1987A with the Chandra X-ray Observatory. We analyze a high resolution spectrum obtained in 1999 October with the high energy...
Monitoring the Evolution of the X-ray Remnant of SN 1987A (2001)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., Nousek, John A., McCray, Richard, Michael, Eli, ...
We report on the results of our monitoring program of the remnant of SN 1987A with the Advanced CCD Imaging Spectrometer (ACIS) on board the {\it Chandra X-ray Observatory}. Two new observations have...
The X-ray Remnant of SN1987A (2000)
Burrows, David N., Michael, Eli, Hwang, Una, McCray, Richard, Chevalier, Roger A., Petre, Robert, ...
We present high resolution Chandra observations of the remnant of SN1987A in the Large Magellanic Cloud. The high angular resolution of the Chandra X-ray Observatory (CXO) permits us to resolve the...
HST Spectroscopy of Spot 1 on the Circumstellar Ring of SN 1987A (2000)
Michael, Eli, McCray, Richard, Pun, C. S. J., Garnavich, Peter, Challis, Peter, Kirshner, Robert P., ...
We present ultraviolet and optical spectra of the first bright spot (PA = 29 degrees) on Supernova 1987A's equatorial circumstellar ring taken with the Space Telescope Imaging Spectrograph. We...
New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A (1998)
Michael, Eli, McCray, Richard, Pun, C. S. J., Borkowski, Kazimierz, Garnavich, Peter, Challis, Peter, ...
We describe and model high velocity (~15,000 km/s) Lyman alpha and Balmer alpha emission from supernova remnant 1987A seen in September and October 1997 with the Space Telescope Imaging Spectrograph....
$10^{51}$ Ergs: The Evolution of Shell Supernova Remnants (1997)
Jones, T. W., Rudnick, Lawrence, Jun, Byung-Il, Borkowski, Kazimierz J., Dubner, Gloria, Frail, Dale A., ...
This paper reports on a workshop hosted by the University of Minnesota, March 23-26, 1997. It addressed fundamental dynamical issues associated with the evolution of shell supernova remnants and the...
An Interstellar Conduction Front Within a Wolf-Rayet Ring Nebula Observed with the GHRS (1996)
Boroson, Bram, McCray, Richard, Clark, Christina Oelfke, Slavin, Jonathan, Mac Low, Mordecai-Mark, Chu, You-Hua, ...
With the High Resolution Spectrograph aboard the Hubble Space Telescope we obtained high signal-to-noise (S/N > 200 - 600 per 17 km/s resolution element) spectra of narrow absorption lines toward the...