STIS spectral imaging of hot spots in SNR 1987A

Astronomy and Astrophysics – Astrophysics

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Supernova Remnants, Pre-Main Sequence Objects, Young Stellar Objects And Protostars, Mass Loss And Stellar Winds

Scientific paper

We report on Space Telescope Imaging Spectrograph (STIS) 52X2 G750M spectra of SNR 1987A obtained in 2000 May, and compared with nearly-identical observations taken in 1997 April. Such carefully-matched observations allow for a clean subtraction of the inner equatorial ring (ER) emission and an improved measurement of the hot spot fluxes. We present Hα fluxes and line widths for the seven hot spots clearly detected in the 2000 May data. We also provide the first description of spatially-compact emission associated with HS 1-029 which spans wide wavelength ranges of the G140L, G230L, G430L and G750L spectra taken in 1999 September and October. We suggest that this apparent continuum most likely arises from free-bound, free-free, and two-photon decay transitions in H I. .

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