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Detection of Bipolar Flow toward an Unusual SiO Maser Source IRAS 19312+1950 | Jun-ichi Nakashima
; Shuji Deguchi
; | Date: |
11 Jun 2004 | Journal: | Astrophys.J. 610 (2004) L41-L44 | Subject: | astro-ph | Affiliation: | U. of Illinois), Shuji Deguchi (Nobeyama Radio Obs. | Abstract: | We report a result of an interferometric observation toward an SiO maser source, IRAS 19312+1950, in the HCO+ J=1-0 line with the Berkeley-Illinois-Maryland-Association (BIMA) Millimeter Array. In the spatially integrated spectrum of HCO+, two kinematic components were seen: a strong line with a narrow width (~2 km/s, narrow component), and a weak symmetric line with a broad width (~60 km/s, broad component). The line profile of HCO+ are reminiscent of that of CO. In the integrated intensity map, we found a pronounced bipolar shape consisting of lower-velocity parts of the broad component. The higher-velocity part of the broad component originated in a relatively small region (< 3"). The spatial structure of the narrow component clearly correlated with near-infrared structure. The position-velocity diagrams indicated presence of a bipolar outflow with an expansion velocity of about 10 km/s. On the basis of the present results, we suggest that the nature of the bipolar flow seen in IRAS 19312+1950 is explained by hydrodynamical interaction between an AGB wind and ambient material with axial symmetric structure. | Source: | arXiv, astro-ph/0406289 | Services: | Forum | Review | PDF | Favorites |
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