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dc.contributor.author
Maureira, María José
dc.contributor.author
Arce, Héctor G.
dc.contributor.author
Dunham, Michael M.
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Pineda, Jaime E.
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Fernandez Lopez, Manuel
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dc.contributor.author
Chen, Xuepeng
dc.contributor.author
Mardones, Diego
dc.date.available
2017-10-17T17:11:52Z
dc.date.issued
2017-03
dc.identifier.citation
Maureira, María José; Arce, Héctor G.; Dunham, Michael M.; Pineda, Jaime E.; Fernandez Lopez, Manuel; et al.; Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm; IOP Publishing; Astrophysical Journal; 838; 1; 3-2017; 1-16
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/26712
dc.description.abstract
We use 3 mm multiline and continuum CARMA observations toward the first hydrostatic core (FHSC) candidate L1451-mm to characterize the envelope kinematics at 1000 au scales and investigate its evolutionary state. We detect evidence of infall and rotation in the NH2D(11,1-10,1), N2H+(1-0), and HCN(1-0) molecular lines. We compare the position-velocity diagram of the NH2D(11,1-10,1) line with a simple kinematic model and find that it is consistent with an envelope that is both infalling and rotating while conserving angular momentum around a central mass of about 0.06 M o. The N2H+(1-0) LTE mass of the envelope along with the inferred infall velocity leads to a mass infall rate of approximately 6 ×10-6 M o yr-1, implying a young age of 104 years for this FHSC candidate. Assuming that the accretion onto the central object is the same as the infall rate, we obtain a minimum source size of 1.5-5 au, consistent with the size expected for a first core. We do not see any evidence of outflow motions or signs of outflow-envelope interaction at scales ≳2000 au. This is consistent with previous observations that revealed a very compact outflow (≲500 au). We conclude that L1451-mm is indeed at a very early stage of evolution, either a first core or an extremely young Class 0 protostar. Our results provide strong evidence that L1451-mm is the best candidate for being a bona fide first core.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Star Formation
dc.subject
Low Mass
dc.subject.classification
Otras Ciencias Físicas
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-10-04T14:54:45Z
dc.journal.volume
838
dc.journal.number
1
dc.journal.pagination
1-16
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Maureira, María José. University of Yale; Estados Unidos
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Fil: Arce, Héctor G.. University of Yale; Estados Unidos
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Fil: Dunham, Michael M.. State University of New York at Fredonia; Estados Unidos
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Fil: Pineda, Jaime E.. Max Planck Institut Fur Extraterrestrische Physik; Alemania
dc.description.fil
Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
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Fil: Chen, Xuepeng. Chinese Academy of Sciences; República de China
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Fil: Mardones, Diego. Universidad de Chile; Chile
dc.journal.title
Astrophysical Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4357/838/1/60
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/1538-4357/838/1/60/meta;jsessionid=B0EC53E96380083B8293759AAF690085.ip-10-40-2-120
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