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- W3103183560 endingPage "60" @default.
- W3103183560 startingPage "60" @default.
- W3103183560 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⊙. 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⊙ 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." @default.
- W3103183560 created "2020-11-23" @default.
- W3103183560 creator A5020215337 @default.
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- W3103183560 creator A5060679701 @default.
- W3103183560 creator A5061565884 @default.
- W3103183560 creator A5073545408 @default.
- W3103183560 date "2017-03-23" @default.
- W3103183560 modified "2023-10-16" @default.
- W3103183560 title "Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm" @default.
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