Apparent-Double SiO Maser Sources
Apparent-Double SiO Maser Sources
复制标题
表观双 SiO 脉泽源
DOI：
10.1093/pasj/51.3.355
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发表时间：
1999
影响因子：
2.3
通讯作者：
I. Yamamura
中科院分区：
文献类型：
--
作者：
S. Deguchi;T. Fujii;H. Izumiura;S. Matsumoto;Y. Nakada;P. Wood;I. Yamamura
在对银盘IRAS源进行43 GHz SiO脉泽巡天的过程中，我们在野边山45米望远镜40”半功率光束中发现了两个双峰SiO脉泽源。这些源（IRAS 18019-1822和18465-0717）光谱中的双峰具有73和147 km s-1的速度分离，表明每个峰来自单独的源。红外成像观测发现了每一个源的候选对应物对，角间距约为20”。结合观测资料，我们认为这些天体是偶然在同一方向上看到的似双SiO源。发现在一个单一的望远镜光束的SiO脉泽源对的发现率被发现是一致的SiO脉泽源的银盘的表面密度。这些源可用于今后VLBI测量大气层的弛豫和自行。
During the course of a SiO maser survey of galactic disk IRAS sources at 43 GHz, we found two cases of doubly peaked SiO maser sources in the 40" half-power beam of the Nobeyama 45-m telescope. The double peaks in the spectra of these sources (IRAS 18019—1822 and 18465-0717) have velocity separations of 73 and 147 km s"1, indicating that each peak comes from a separate source. Infrared imaging observations found pairs of candidate counterparts for each source with angular separations of about 20". Combining the observational data, we conclude that these objects are apparent-double SiO sources, which are by chance seen in the same direction. The discovery rate for pairs of SiO maser sources in a single telescope beam is found to be consistent with the surface density of SiO maser sources in the galactic disk. These sources can be used to measure the parallaxes and proper motions with VLBI in the future.