Two new light echo structures from SN 1987A at large distances

Details Two new light echo structures from SN 1987A at large distances Two new light echo structures from SN 1987A at large distances

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..274x&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 1, p. 274-278

Astronomy and Astrophysics

Astrophysics

16

Astronomical Models, Echoes, Forward Scattering, Interstellar Matter, Light Scattering, Magellanic Clouds, Supernova Remnants, Supernovae, Bubbles, Cosmic Dust, Mass, Mathematical Models

Scientific paper

Observations since 1991 September 18 reveal two new (and possibly related) light echo structures at 3140 and 3240 lt-yr in the Supernova (SN) foreground. The details are presented herein. A forward-scattering light echo model is used to calculate the dust mass swept up by these echoes of 4.0 Solar mass and 1.7 Solar mass as of 1993 May 1, and their extinction Av of 0.052 and 0.044 mag. The extinction calculated from light echo surface brightness is shown to depend only weakly on dust models. We further speculate that these dust clouds, and the large-scale structures suggested by Bruhweiler et al. (1991), may be due to the same giant superbubble in the Large Magellanic Clouds, which was formed from the merger of several smaller superbubbles.

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