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The Structure of the Circumstellar Envelope of SN 1987A
Arlin P. S. Crotts
The volume around the SN 1987A contains a variety of structures, not just the three rings glowing in recombination lines. Many of these are revealed by light echoes, so are mapped…
MEGA, a Wide-Field Survey of Microlensing in M31
A. P. S. Crotts, R. Uglesich, G. Gyuk
We detail how microlensing internal to M31 could be used to test whether a large fraction of the matter in spiral galaxy haloes is composed of dark objects with masses comparable t…
SN 1987A's Circumstellar Envelope, II: Kinematics of the Three Rings and the Diffuse Nebula
Arlin P. S. Crotts, Stephen R. Heathcote
We present several different measurements of the velocities of structures within the circumstellar envelope of SN 1987A, including the inner, equatorial ring (ER), outer rings (ORs…
ISO SWS/LWS observations of SN 1987A
P. Lundqvist, J. Sollerman, C. Kozma +5
We report on observations of SN 1987A with ISO SWS/LWS made 9 - 11 years after the explosion. No emission from the supernova was seen. In particular, the upper limits on the fluxes…
Expectations from Realistic Microlensing Models of M31. I: Optical Depth
Geza Gyuk, Arlin Crotts
We provide a set of microlensing optical depth maps for M31. Optical depths towards Andromeda were calculated on the basis of a four component model of the lens and source populati…