STIS Observations of Shock Interaction Around SN 1987A

Details STIS Observations of Shock Interaction Around SN 1987A STIS Observations of Shock Interaction Around SN 1987A

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4013s&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #40.13; Bulletin of the American Astronomical Society, Vol. 29, p.1269

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Scientific paper

Visual and ultraviolet spatially resolved ( ~ 0\farcs1) spectra of SN1987A obtained were with STIS on days 3715 and 3743 (27 Apr. and 25 May 1997) show that high-velocity SN debris is colliding with circumstellar gas. Very broad Ly-alpha emission with velocities extending to ~ +/-20,000kms(-1) originates inside the inner circumstellar ring and appears to fill most of the surface area within 0\farcs67 +/- 0\farcs03 (0.14 pc at a distance of 50 kpc) of the ring's center. The observed Ly-alpha flux from the shocked ejecta is (1.85 +/- 0.53)x 10(-13) erg(-1) cm(-2) s(-1) and (1.25 +/- 0.51)x 10(-12) erg(-1) cm(-2) s(-1) after correcting for extinction. A spatially unresolved blue-shifted emission feature was discovered in H-alpha (and other lines) on the inner ring at p.a.31(deg) +/- 8(deg) . The Hα emission extends to --250 km s(-1) with no corresponding red-shifted emission. This highly localized interaction appears to be the initial contact of the supernova blast wave with an inward protrusion of the inner ring. The broad Ly-alpha emission and the `hot spot' are separate interaction phemonena associated with the reverse and forward shocks, respectively. STIS spectra also show that the size of the inner ring in [O I] 6300, [O II] 3727, and [O III] 5007 has a dependence on ionization potential, in agreement with photoionization models of the ring. New UV and visual spectra are planned for Dec. 1997.

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