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Imaging of the Radio Remnant of SN 1987A at 12 mm Wavelength | | R. N. Manchester
; B. M. Gaensler
; L. Staveley-Smith
; M. J. Kesteven
; A. K. Tzioumis
; | | Date: |
21 Jun 2005 | | Journal: | Astrophys.J. 628 (2005) L131-L134 | | Subject: | astro-ph | | Abstract: | Observations of the radio remnant of Supernova 1987A using the Australia Telescope Compact Array in the 12-mm band on 2003 July 31 (day 6002.7 after the explosion) give the first fully resolved radio image of the supernova remnant. The diffraction-limited image has a resolution of about 0.45 arcsec, a factor of two better than that of the 3-cm images previously obtained. There is excellent agreement between the 12-mm image and a contemporaneous super-resolved 3-cm image. Super-resolution of the 12-mm image gives a further factor of two improvement in resolution, to 0.25 arcsec, albeit with limited dynamic range. While the spatial distributions of the radio and X-ray emission are broadly similar, there are significant differences in detail with no correspondence in the regions of brightest emission. The 12-mm image is well modelled by a thick equatorial ring inclined at 43 deg to the line of sight. This, together with the common east-west asymmetry and the relatively steady increase in the radio flux density, suggests that the reverse shock is the main site for generation of the radio emission. | | Source: | arXiv, astro-ph/0506475 | | Services: | Forum | Review | PDF | Favorites | |
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