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- W2064536304 abstract "We observed the Cygnus Loop with XMM-Newton (9 pointings) and Suzaku (32 pointings) between 2002 and 2008. The total effective exposure time is 670.2 ks. By using all of the available data, we intended to improve a signal-to-noise ratio of the spectrum. Accordingly, the accumulated spectra obtained by the XIS and the EPIC show some line features around 3 keV that are attributed to the S He|$beta$| and Ar He|$alpha$| lines, respectively. Since the Cygnus Loop is an evolved (|$sim $| 10000 yr) supernova remnant whose temperature is relatively low (|$lt $| 1 keV) compared with other young remnants, its spectrum is generally faint above 3.0 keV, no emission lines, such as the Ar-K line, have ever been detected. The detection of the Ar-K line is the first time, and we found that its abundance is significantly higher than that of the solar value: 9.0|$^{+4.0}_{-3.8}$| and 8.4|$^{+2.5}_{-2.7}$| (in units of solar), estimated from the XIS and the EPIC spectra, respectively. We conclude that the Ar-K line originated from the ejecta of the Cygnus Loop. Follow-up X-ray observations to tightly constrain the abundances of Ar-rich ejecta will be useful to accurately estimate the progenitor's mass." @default.
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- W2064536304 date "2011-02-25" @default.
- W2064536304 modified "2023-09-30" @default.
- W2064536304 title "First Detection of Ar-K Line Emission from the Cygnus Loop" @default.
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- W2064536304 doi "https://doi.org/10.1093/pasj/63.1.199" @default.
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