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A VLBI Study of H2O Maser Spots Associated with a Molecular Outflow ρ Oph-East

Published online by Cambridge University Press:  12 April 2016

Takahiro Iwata ,
Hiroshi Takaba ,
Kin-Ya Matsumoto ,
Seiji Kameno  and
Noriyuki Kawaguchi
Takahiro Iwata
Affiliation:
Kashima Space Research Center, Communications Research Laboratory, 893-1 Hirai, Kashima, Ibaraki 314, JAPAN
Hiroshi Takaba
Affiliation:
Kashima Space Research Center, Communications Research Laboratory, 893-1 Hirai, Kashima, Ibaraki 314, JAPAN
Kin-Ya Matsumoto
Affiliation:
University of Electro-Communications
Seiji Kameno
Affiliation:
Department of Astronomy, Tokyo University
Noriyuki Kawaguchi
Affiliation:
Nobeyama Radio Observatory, National Astronomy Observatory

Extract

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A molecular outflow is one of the most conspicuous active phenomena associated with protostars, and the kinetic energy of its outflowing mass is as large as that of random motions of ambient molecular cloud, which suggests that outflow has dynamically influence on ambient molecular gas. Possible observational evidence which suggests the existence of dynamical interaction between molecular outflow and ambient molecular cloud has been detected in several star forming regions (Fukui et al. 1986; Iwata et al. 1988). Recent detections of H2O maser emission associated with low-mass protostars (e.g. Comoretto et al. 1990) also suggest that there still exist active phenomena in the low-mass star forming regions.

Molecular outflow ρ Oph-East, discovered toward a low-mass protostar IRAS 16293-2422 (Fukui et al. 1986), has been known as a site of dynamical interaction between molecular outflowing gas and ambient molecular cloud by CO and NH3 observation (Mizuno et al. 1990). Existence of several strong H2O maser spots (Wilking & Claussen 1987; Wotten 1989; Terebey et al. 1992) also suggests that active phenomena are occurring in this region. In this paper, we report our result of H2O maser observation for molecular outflow ρ Oph-East with milli-arcsecond resolution by VLBI.

Type
1. Recent Developments and Upgrading Plans for the Near Future
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 60 - 61
Copyright
Copyright © Astronomical Society of the Pacific 1994

References

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