Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725627n&link_type=abstract
American Astronomical Society, AAS Meeting #217, #256.27; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present high resolution radio and X-ray observations of supernova remnant 1987A. VLBI imaging at 1.4 and 1.7 GHz taken in 2007 and 2008 with the Australian Long Baseline Array provides the highest resolution radio images of the remnant to date, revealing two extended lobes with an overall morphology consistent with observations at lower resolutions. We find evidence of small-scale features in the radio remnant, which possibly consist of discrete clumps near the inner surface of the shell. These features have spatial extent smaller than 0.2" and contribute less than 13% of the total remnant flux. We also report new X-ray observation taken in 2010 August with the High Resolution Camera onboard the Chandra X-ray Observatory. Comparing to the 2008 April exposure with the same instrument, the remnant flux increased by 43% in the 0.08-10 kev range and the relative brightness of the X-ray lobes around the shell show significant variability. In particular, the western half of shell is now 15% brighter than the eastern half. No central compact object is found in the radio and X-ray images. We compare the detection limits to previous studies and discuss the physical implications.
The Australia Long Baseline Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
Gaensler Bryan M.
Murray Stephen S.
Ng Chi-Yung
Phillips Chris
Potter T. M.
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