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- 저자 : Kusuno, Kozue (검색결과 1 건)
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SiO MASERS AROUND WX PSC MAPPED WITH THE KVN AND VERA ARRAY (KaVA)
Yun, Youngjoo,Cho, Se-Hyung,Imai, Hiroshi,Kim, Jaeheon,Asaki, Yoshiharu,Chibueze, James O.,Choi, Yoon Kyung,Dodson, Richard,Kim, Dong-Jin,Kusuno, Kozue,Matsumoto, Naoko,Min, Cheulhong,Oyadomari, Miyak American Astronomical Society 2016 The Astrophysical journal Vol.822 No.1
<P>We present the first images of the v = 1 and v = 2 J = 1 -> 0 SiO maser lines taken with KaVA, i.e., the combined array of the Korean Very Long Baseline Interferometry (VLBI) Network and the VLBI Exploration of Radio Astrometry ( VERA), toward the OH/IR star WX Psc. The combination of long and short antenna baselines enabled us to detect a large number of maser spots, which exhibit a typical ring-like structure in both the v. =. 1 and v = 2 J = 1 -> 0 SiO masers as those that have been found in previous VLBI observational results of WX Psc. The relative alignment of the v = 1 and v = 2 SiO maser spots are precisely derived from astrometric analysis, due. to the absolute coordinates of the reference maser spot that were well determined in an independent astrometric observation with VERA. The superposition of the v = 1 and v = 2 maser spot maps shows a good spatial correlation between the v = 1 and v = 2 SiO maser features. Nevertheless, it is also shown that the v = 2 SiO maser spot is distributed in an inner region compared to the v - 1 SiO maser by about 0.5 mas on average. These results provide good support for the recent theoretical studies of the SiO maser pumping, in which both the collisional and the radiative pumping predict the strong spatial correlation and the small spatial discrepancy between the v = 1 and v = 2 SiO maser.</P>
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