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The Ultraluminous X-ray Sources near the Center of M82
A. K. H. Kong, Y. J. Yang, P. -Y. Hsieh +2
We report the identification of a recurrent ultraluminous X-ray source (ULX), a highly absorbed X-ray source (possibly a background AGN), and a young supernova remnant near the cen…
High Resolution X-Ray Imaging of the Center of IC342
Daisy S. Y. Mak, Chun. S. J. Pun, Albert K. H. Kong
We presented the result of a high resolution (FWHM~0.5'') 12 ks Chandra HRC-I observation of the starburst galaxy IC342 taken on 2 April 2006. We identified 23 X-ray sources within…
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…
Could electron-positron annihilation lines in the Galactic center result from pulsar winds?
W. Wang, C. S. J. Pun, K. S. Cheng
we study the possibility of pulsar winds in the Galactic center (GC) to produce the 511 keV line. We propose that there may exist three possible scenarios of pulsar winds as the po…
Limits from the Hubble Space Telescope on a Point Source in SN 1987A
G. J. M. Graves, P. M. Challis, R. A. Chevalier +16
We observed supernova 1987A (SN 1987A) with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) in 1999 September, and again with the Advanced Camer…
Early Re-brightenings in GRB Afterglows as Signatures of Low-to-High Density Boundary
P. H. Tam, C. S. J. Pun, Y. F. Huang +1
The association of long gamma-ray bursts (GRBs) with star forming regions and the idea of massive stars as progenitors of GRBs are widely accepted. Because of their short lifetimes…