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ALMA reveals a candidate hot and compact disc around the O-type protostar IRAS 16547−4247

Authordc.contributor.authorZapata, Luis A. 
Authordc.contributor.authorPalau, Aina 
Authordc.contributor.authorGalván Madrid, Roberto 
Authordc.contributor.authorRodríguez, Luis F. 
Authordc.contributor.authorGaray Brignardello, Guido 
Authordc.contributor.authorMorán, James M. 
Authordc.contributor.authorFranco Hernández, Ramiro 
Admission datedc.date.accessioned2015-08-04T20:21:38Z
Available datedc.date.available2015-08-04T20:21:38Z
Publication datedc.date.issued2015
Cita de ítemdc.identifier.citationMonthly Notices of the Royal Astronomical Society 447, 1826–1833 (2015)en_US
Identifierdc.identifier.otherDOI: 10.1093/mnras/stu2527
Identifierdc.identifier.urihttp://repositorio.uchile.cl/handle/2250/132379
General notedc.descriptionArtículo de publicación ISIen_US
Abstractdc.description.abstractWe present high angular resolution (similar to 0.3 arcsec) submillimeter continuum (0.85 mm) and line observations of the O-type protostar IRAS 16547-4247 carried out with the Atacama Large Millimeter/Submillimeter Array (ALMA). In the 0.85 mm continuum band, the observations revealed two compact sources (with a separation of 2 arcsec), one of them associated with IRAS 16547-4247, and the other one to the west. Both sources are well-resolved angularly, revealing a clumpy structure. On the other hand, the line observations revealed a rich variety of molecular species related to both continuum sources. In particular, we found a large number of S-bearing molecules, such as the rare molecule methyl mercaptan (CH3SH). At scales larger than 10 000 au, molecules (e. g. SO2 or OCS) mostly with low-excitation temperatures in the upper states (E-k less than or similar to 300 K) are present in both millimeter continuum sources, and show a southeast-north-west velocity gradient of 7 kms(-1) over 3 arcsec (165 km s(-1) pc(-1)). We suggest that this gradient probably is produced by the thermal (free-free) jet emerging from this object with a similar orientation at the base. At much smaller scales (about 1000 au), molecules with high-excitation temperatures (E-k >= 500 K) are tracing a rotating structure elongated perpendicular to the orientation of the thermal jet, which we interpret as a candidate disc surrounding IRAS 16547-4247. The dynamical mass corresponding to the velocity gradient of the candidate to disc is about 20M(circle dot), which is consistent with the bolometric luminosity of IRAS 16547-4247.en_US
Lenguagedc.language.isoenen_US
Publisherdc.publisherOxford University Pressen_US
Type of licensedc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
Link to Licensedc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
Keywordsdc.subjectISM: jets and outflowsen_US
Keywordsdc.subjectStars: protostarsen_US
Títulodc.titleALMA reveals a candidate hot and compact disc around the O-type protostar IRAS 16547−4247en_US
Document typedc.typeArtículo de revistaen_US


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Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 Chile