Recent X-Ray Evolution of Supernova Remnant 1987A
Abstract
Based on our latest Chandra data, we report on the updates in the evolution of supernova remnant (SNR) 1987A. The high resolution dispersed spectrum, taken in March 2018 with our deep (340 ks) HETG observation, shows that the Heα to Lyα line flux ratios for the Si and Mg ions have considerably decreased (by ~40%) between 2011 and 2018. The 3-D hydrodynamic simulations that self-consistently reproduced the line profiles for our March 2011 observation underestimate the increase of these Lyα fluxes observed in 2018. The characteristic soft and hard component temperatures are both increasing for the last few years. We present the updated X-ray light curves and the SNR's overall expansion rate. These recent changes may be related to the shock evolution through the interactions with the inner ring, ejecta, and beyond.
- Publication:
-
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020
- Bibcode:
- 2020AAS...23530713R