Observing Supernova 1987A with the Refurbished Hubble Space Telescope

Details Observing Supernova 1987A with the Refurbished Hubble Space Telescope Observing Supernova 1987A with the Refurbished Hubble Space Telescope

2010-09-02

arxiv.org/abs/1009.0518v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Science, accepted. Science Express, 02 Sept 2010. 5 figures. Supporting online material can be found at http://www.sciencema

Scientific paper

Observations with the Hubble Space Telescope (HST), conducted since 1990, now offer an unprecedented glimpse into fast astrophysical shocks in the young remnant of supernova 1987A. Comparing observations taken in 2010 using the refurbished instruments on HST with data taken in 2004, just before the Space Telescope Imaging Spectrograph failed, we find that the Ly-a and H-a lines from shock emission continue to brighten, while their maximum velocities continue to decrease. We observe broad blueshifted Ly-a, which we attribute to resonant scattering of photons emitted from hotspots on the equatorial ring. We also detect NV~\lambda\lambda 1239,1243 A line emission, but only to the red of Ly-A. The profiles of the NV lines differ markedly from that of H-a, suggesting that the N^{4+} ions are scattered and accelerated by turbulent electromagnetic fields that isotropize the ions in the collisionless shock.

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