New Hubble Space Telescope Observations of High-Velocity LYalpha and Hα in SNR 1987A

Details New Hubble Space Telescope Observations of High-Velocity LYalpha and Hα in SNR 1987A New Hubble Space Telescope Observations of High-Velocity LYalpha and Hα in SNR 1987A

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...509l.117m&link_type=abstract

The Astrophysical Journal, Volume 509, Issue 2, pp. L117-L120.

Astronomy and Astrophysics

Astronomy

28

Stars: Circumstellar Matter, Shocks, Ism: Supernova Remnants

Scientific paper

We describe and model high-velocity (~15,000 km s^-1) Lyalpha and Hα emission from the supernova remnant SNR 1987A seen in 1997 September and October with the Space Telescope Imaging Spectrograph. Part of this emission comes from a reverse shock located at ~75% of the radius of the inner boundary of the inner circumstellar ring and confined within +/-30 deg of the equatorial plane. Departure from axisymmetry in the Lyalpha and Hα emission correlates with that seen in nonthermal radio emission and reveals an asymmetry in the circumstellar gas distribution. We also see diffuse high-velocity Lyalpha emission from supernova debris inside the reverse shock that may be due to excitation by nonthermal particles accelerated by the shock.

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