557 GH[CLC]z[/CLC] Observations of Water Vapor Outflow from VY Canis Majoris and W Hydrae | Zendy

Martin Harwit | Zendy; Edwin A. Bergin | Zendy

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557 GH[CLC]z[/CLC] Observations of Water Vapor Outflow from VY Canis Majoris and W Hydrae

Author(s) -

Martin Harwit,

Edwin A. Bergin

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339365

Subject(s) - outflow , astrophysics , physics , line (geometry) , context (archaeology) , emission spectrum , flux (metallurgy) , water vapor , astronomy , spectral line , chemistry , geology , geometry , meteorology , paleontology , mathematics , organic chemistry

We report the first detection of thermal water vapor emission in the 557 GHz,$1_{10} - 1_{01}$ ground state transition of ortho-H$_2$O toward VY CanisMajoris. In observations obtained with the Submillimeter Wave AstronomySatellite (SWAS), we measured a flux of $\sim 450 $Jy, in a spectrally resolvedline centered on a velocity $v_{LSR} = 25 $km s$^{-1}$ with a full width halfmaximum of $\sim 35$ km s$^{-1}$, somewhat dependent on the assumed line shape.We analyze the line shape in the context of three different radial outflowmodels for which we provide analytical expressions. We also detected a weaker557 GHz emission line from W Hydrae. We find that these and other H$_2$Oemission line strengths scale as suggested by Zubko and Elitzur (2000).Comment: Astrophysical Journal Letters, accepte

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