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: http://www.stsci.edu/stsci/meetings/irw/proceedings/challisp.dir/challisp.html
Дата изменения: Mon Jun 6 20:57:13 1994 Дата индексирования: Sun Dec 23 19:31:57 2007 Кодировка: |
Peter Challis
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
The movie consists of 5 sequences each showing a particular aspect of SN 1987A. For each sequence, 100 images (or one every 11 days) were created by interpolating between the observations, using a cubic spline. The images were then shown in succession at a rate of 66 days/second using the animation software in IDL.
The first sequence shows the raw FOC F/96 F501N [OIII] observations centered on the debris and with a field of view of 2."2. The fading of the circumstellar ring and debris is quite dramatic. The entire ring fades surprisingly uniformly. The Richardson-Lucy algorithm was used to deconvolve the F501N images to create the next sequence. A nearby bright star in each image was used as the PSF. Since we have low S/N nebular data we stopped the iterations at a relatively low number of 30. The deconvolved images show convincingly that the structure of the ring is clumpy, that the clumps are all about the same size, and that the debris is extended. The third sequence shows the step by step iteration of the deconvolution. This is followed by a comparision between a raw and final deconvolved image. This comparision provides confidence that the deconvolved images restore the raw images without creating false structure.
The fourth and fifth sequences show the raw and deconvolved images of only the central debris from the FOC F/96 F275W observations with a field of view of 0."56. The expansion of the debris is striking. Both sequences show some asymmetry and possible extension in the N-S direction. It will be interesting to compare the recent deconvolved images of SN 1987A with the COSTAR improved images. This method of interpolating and animating provides a visual tool to aid in the understanding of time sequenced data.
Panagia, N., Baxter, D., Gilmozzi, R., Macchetto, F., Adorf, H.-M., Jakobsen, P., &Kirshner, R. P. 1993, in Science with the Hubble Space Telescope, P. Benvenuti &E. Schreier, eds., 175
White, R. L 1993, in Restoration Newsletter, R. J. Hanisch, ed., Space Telescope Science Institute, 1, 12