Upper Limit to the Distance to the Large Magellanic Cloud

Details Upper Limit to the Distance to the Large Magellanic Cloud Upper Limit to the Distance to the Large Magellanic Cloud

1997-05-07

arxiv.org/abs/astro-ph/9705051v2

Astronomy and Astrophysics

Astrophysics

Contains new evidence that the ring is elliptical, courtesy of A.P.S. Crotts. This raises the upper limit to \mu_lmc < 18.44 +

Scientific paper

10.1086/305193

We remeasure the ``light echo'' times to the near and far side of the ring around SN 1987A using the method of Gould (1995) and the new reductions of the original UV spectra by Sonneborn et al. (1996). Under the assumption that the ring is circular, we obtain an upper limit to the distance to the Large Magellanic Cloud \mu_lmc < 18.37 +/- 0.04. This result is very close to Gould's original value, and contradicts claims that the new spectra measurements lead to a significant increase in the distance estimate and a substantial increase in the statistical errors. We present new evidence (partly provided by A.P.S. Crotts) that the ring is intrinsically elliptical, with axis ratio b/a ~ 0.95. For an elliptical ring, \mu_lmc < 18.44 +/- 0.05. We elaborate on Gould's original argument that the upper limit is robust, i.e., that it is only weakly sensitive to unmodeled aspects of the ring such as its hydrodynamic properties and ionization history.

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