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The Chandra X-ray Spectrum of the 10.6 s Pulsar in Westerlund 1: Testing the Magnetar Hypothesis
S. L. Skinner, R. Perna, S. A. Zhekov
Two sensitive Chandra X-ray observations of the heavily-reddened galactic starburst cluster Westerlund 1 in May and June 2005 detected a previously unknown X-ray pulsar (CXO J16471…
Evolutionary Status of SNR 1987A at the Age of Eighteen
Sangwook Park, Svetozar A. Zhekov, David N. Burrows +3
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 o…
Chandra LETG Observations of Supernova Remnant 1987A
Svetozar A. Zhekov, Richard McCray, Kazimierz J. Borkowski +2
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…
Evolution of the Reverse Shock Emission from SNR 1987A
Kevin Heng, Richard McCray, Svetozar A. Zhekov +13
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…
A Rich Population of X-ray Emitting Wolf-Rayet Stars in the Galactic Starburst Cluster Westerlund 1
S. L. Skinner, A. E. Simmons, S. A. Zhekov +3
Recent optical and IR studies have revealed that the heavily-reddened starburst cluster Westerlund 1 (Wd 1) contains at least 22 Wolf-Rayet (WR) stars, comprising the richest WR po…