Astrometry of H$ {2}$O Masers in Nearby Star-Forming Regions with VERA. III. IRAS 22198 6336 in L1204G - AstrophysicsReport as inadecuate




Astrometry of H$ {2}$O Masers in Nearby Star-Forming Regions with VERA. III. IRAS 22198 6336 in L1204G - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present results of multi-epoch VLBI observations with VERA VLBIExploration of Radio Astrometry of the 22 GHz H$ {2}$O masers associated witha young stellar object YSO IRAS 22198+6336 in a dark cloud L1204G. Based onthe phase-referencing VLBI astrometry, we derive an annual parallax of IRAS22198+6336 to be 1.309$\pm$0.047 mas, corresponding to the distance of764$\pm$27 pc from the Sun. Although the most principal error source of ourastrometry is attributed to the internal structure of the maser spots, wesuccessfully reduce the errors in the derived annual parallax by employing theposition measurements for all of the 26 detected maser spots. Based on thisresult, we reanalyze the spectral energy distribution SED of IRAS 22198+6336and find that the bolometric luminosity and total mass of IRAS 22198+6336 are450$L {\odot}$ and 7$M {\odot}$, respectively. These values are consistent withan intermediate-mass YSO deeply embedded in the dense dust core, which has beenproposed to be an intermediate-mass counterpart of a low-mass Class 0 source.In addition, we obtain absolute proper motions of the H$ {2}$O masers for themost blue-shifted components. We propose that the collimated jets aligned alongthe east-west direction are the most plausible explanation for the origin ofthe detected maser features.



Author: Tomoya Hirota, Kazuma Ando, Takeshi Bushimata, Yoon Kyung Choi, Mareki Honma, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Seij

Source: https://arxiv.org/



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