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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 
Cita de ítemdc.identifier.citationMonthly Notices of the Royal Astronomical Society 447, 1826–1833 (2015)en_US
Identifierdc.identifier.otherDOI: 10.1093/mnras/stu2527
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
Publisherdc.publisherOxford University Pressen_US
Type of licensedc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
Link to Licensedc.rights.uri*
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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Atribución-NoComercial-SinDerivadas 3.0 Chile
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 Chile