Coronal emission from the shocked circumstellar ring of SN 1987A

Details Coronal emission from the shocked circumstellar ring of SN 1987A Coronal emission from the shocked circumstellar ring of SN 1987A

2006-03-30

arxiv.org/abs/astro-ph/0603815v2

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20065325

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 roughly 350 km/s, 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 about 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 310-390 km/s, corresponding to a shock temperature of (1.6-2.5) x 10^6 K. A fraction of the coronal emission may, however, originate in higher velocity adiabatic shocks.

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