New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A

Details New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A

1998-09-10

arxiv.org/abs/astro-ph/9809138v2

Astronomy and Astrophysics

Astrophysics

10 pages, 3 postscript figures. Submitted to ApJL on Sept 8, 1998; accepted Oct. 20, 1998. Text adjusted to referee's comments

Scientific paper

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. 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 degrees of the equatorial plane. Departure from axisymmetry in the Lyman alpha and Balmer alpha emission correlates with that seen in nonthermal radio emission and reveals an asymmetry in the circumstellar gas distribution. We also see diffuse high velocity Lyman alpha 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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