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Probing Elemental Abundances in SNR 1987A Using XMM-Newton
Kevin Heng, Frank Haberl, Bernd Aschenbach +1
We report on the latest (2007 Jan) observations of supernova remnant (SNR) 1987A from the XMM-Newton mission. Since the 2003 May observations of Haberl et al. (2006), 11 emission l…
Broad Lyman-Alpha Emission from Supernova Remnants in Young Galaxies
Kevin Heng, Rashid Sunyaev
Charge transfer (or exchange) reactions between hydrogen atoms and protons in collisionless shocks of supernova remnants (SNRs) are a natural way of producing broad Balmer, Lyman a…
The Transition Zone in Balmer-Dominated Shocks
Kevin Heng, Matthew van Adelsberg, Richard McCray +1
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 i…
The Reverse Shock of SNR 1987A
Kevin Heng
The reverse shock of supernova remnant (SNR) 1987A emits in H-alpha and Ly-alpha, and comes in two flavors: surface and interior. The former is due to direct, impact excitation of…
Dust Echoes from the Ambient Medium of Gamma-Ray Bursts
Kevin Heng, Davide Lazzati, Rosalba Perna
Long gamma-ray bursts (GRBs) are likely associated with the collapse of massive stars, which produce dust and are born in dusty environments. Absorption and scattering of ultraviol…