High Forbidden-to-resonance Line Ratio of OVII Discovered in the Cygnus Loop
作者： H. Uchida , S. Katsuda , H. Tsunemi , K. Mori , L. Gu
关键词: Bright spot 、 Spectroscopy 、 Physics 、 Ion 、 Blast wave 、 Ionization 、 Thermal 、 Cygnus Loop 、 Astrophysics 、 Supernova remnant
摘要: Charge exchange (CX) is an important process in shock physics since it indicates interaction between downstream ions and ambient neutral hydrogen, suggesting a presence of collisionless shock. We present high-resolution spectroscopy X-ray bright spot nearby supernova remnant (SNR), the Cygnus Loop, with Reflection Grating Spectrometer (RGS) onboard XMM-Newton. The target compact knotty structure called "southwestern knot (SW-K)" located at outer edge shell, where blast wave likely interacting dense surrounding materials. RGS spectrum SW-K shows details line features below ~ 1 keV, we discover high forbidden-to-resonance ratio OVII He$\alpha$. soft-band (10-35 \AA) well explained by thermal component CX emission obscured ionized absorbers. will provide new insights into SNRs. also reveals that CNO, Ne Fe abundances are truly lower than solar values (0.2-0.4 solar) region . Our result gives clue to solving previously known "low-abundance problem" reported from number evolved
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