Observation of the ejecta in the Cygnus Loop

Although the Cygnus Loop is a middleaged SNR, it contains fresh ejecta in itscenter. Since the ejecta are higher temperature than that of the sweptup ISM,we can clearly detect FeL, Mg, Si, S emission lines from ejecta. However theejecta are surrounded by the sweptup ISM, which makes us difficult to study theemission from O and N in the ejecta where the emission from the shell dominates.There is a blowup region in the south of the Cygnus Loop where, we expect, theejecta are spew out from the shell. There is no surrounding swept up matter. Dueto its proximity, there is very little interstellar absorption feature. Wepropose to observe the south blowup region to investigate the ejecta withoutobstacle. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]