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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1430
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dc.contributor.authorZhang, Q.-
dc.contributor.authorHunter, T.R.-
dc.contributor.authorSridharan, T.K.-
dc.contributor.authorCesaroni, R.-
dc.date.accessioned2006-07-10T08:00:46Z-
dc.date.available2006-07-10T08:00:46Z-
dc.date.issued1999-12-20-
dc.identifier.citationAstrophysical Journal Letters, 1999, Vol.527, pL117-L120en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/1430-
dc.description.abstractWe present the discovery of shock-excited NH3 in a well-collimated jet associated with the extremely young high-mass star IRAS 20126+4104. The NH3 (3, 3) and (4, 4) emission is dominated by three clumps along the SiO jet. At the end of the jet, there exists strong and broad (+/-10 km s-1) NH3 (3, 3) emission. With typical brightness temperatures greater than 500 K, the overall emission indicates a weakly inverted population and appears in an arc, consistent with the excitation by bow shocks. There are two bright spots in the NH3 (3, 3) emission with brightness temperatures of approximately 2000 K. The narrow line width (1.5 km s-1 FWHM), the small sizes (<0.3"), and the unusually high brightness temperature of the features are indicative of maser emission. Our observations provide clear evidence that NH3 (3, 3) masers are excited in shock regions in molecular outflows.en
dc.format.extent320936 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://dx.doi.org/10.1086/312411en
dc.rights(1999) by the American Astronomical Society.en
dc.subjectISM: H II REGIONSen
dc.subjectISM: CLOUDSen
dc.subjectISM: INDIVIDUAL: ALPHANUMERIC: IRAS 20126+4104,en
dc.subjectISM: KINEMATICS AND DYNAMICS, MASERSen
dc.subjectSTARS: FORMATIONen
dc.subjectSTARS: PRE-MAIN-SEQUENCEen
dc.titleShock-heated NH3 in a molecular jet associated with a high-mass young staren
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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