Microstructure and kinematics of H2O masers in the massive star forming region IRAS 06061+2151

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dc.creatorMotogi, K.
dc.creatorWatanabe, Y.
dc.creatorSorai, K.
dc.creatorHabe, A.
dc.creatorHonma, M.
dc.creatorImai, H.
dc.creatorYamauchi, A.
dc.creatorKobayashi, H.
dc.creatorFujisawa, K.
dc.creatorOmodaka, T.
dc.creatorTakaba, H.
dc.creatorShibata, K. M.
dc.creatorMinamidani, T.
dc.creatorWakamatsu, K.
dc.creatorSudou, H.
dc.creatorKawai, E.
dc.creatorKoyama, Y.
dc.date2008-09-03
dc.date.accessioned2026-07-07T10:00:20Z
dc.date.available2026-07-07T10:00:20Z
dc.descriptionWe have made multi-epoch VLBI observations of H2O maser emission in the massive star forming region IRAS 06061+2151 with the Japanese VLBI network (JVN) from 2005 May to 2007 October. The detected maser features are distributed within an 1\arcsec$\times$1\arcsec (2000 au$\times$2000 au at the source position) around the ultra-compact H {\small\bf II} region seen in radio continuum emission. Their bipolar morphology and expanding motion traced through their relative proper motions indicate that they are excited by an energetic bipolar outflow. Our three-dimensional model fitting has shown that the maser kinematical structure in IRAS 06061+2151 is able to be explained by a biconical outflow with a large opening angle ($>$ 50\degr). The position angle of the flow major axis coincides very well with that of the large scale jet seen in 2.1$\:μ\rmn{m}$ hydrogen emission. This maser geometry indicates the existence of dual structures composed of a collimated jet and a less collimated massive molecular flow. We have also detected a large velocity gradient in the southern maser group. This can be explained by a very small (on a scale of several tens of au) and clumpy (the density contrast by an order of magnitude or more) structure of the parental cloud. Such a structure may be formed by strong instability of shock front or splitting of high density core.
dc.description14 pages, 6 figures accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/0809.0605
dc.identifierhttp://arxiv.org/abs/0809.0605
dc.identifierdoi:10.1111/j.1365-2966.2008.13727.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168298
dc.subjectAstrophysics
dc.titleMicrostructure and kinematics of H2O masers in the massive star forming region IRAS 06061+2151
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