2006/03/31 by Per Groeningsson, Per Gröningsson, Claes Fransson +11
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Ejecta #Emission spectrum #Flare #Gamma-ray bursts and supernovae #Ion #Ionization #Line (geometry) #Optics #Physics #Radiative transfer #Shock (circulatory) #Shock wave #Spectral line #Stellar, planetary, and galactic studies #Supernova #astro-ph
paper · pdf · doi:10.1051/0004-6361:20065325
11 pages, 10 figures, accepted for publication in A&A
arxiv created 2006/06/22 · openalex publication_date 2006/08/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
High resolution spectra with UVES/VLT of SN 1987A from December 2000 until November 2005 show a number of high ionization lines from gas with velocities of ~ , emerging from the shocked gas formed by the ejecta–ring collision. These include coronal lines from [Fe X], [Fe XI] and [Fe XIV] which have increased by a factor of ~ 20 during the observed period. The evolution of the lines is similar to that of the soft X-rays, indicating that they arise in the same component. The line ratios are consistent with those expected from radiative shocks with velocity , corresponding to a shock temperature of K. A fraction of the coronal emission may, however, originate in higher velocity adiabatic shocks.