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• W1988886686 abstract "We present a study of the natal core harboring the low-mass Class 0 protostar GF 9-2 in the filamentary dark cloud GF 9 using the Nobeyama 45 m and CSO 10.4 m telescopes and the OVRO millimeter array. GF 9-2 is unique in the sense that it shows H2O masers, a clear signpost of protostar formation, but does not have a high-velocity large-scale outflow. These facts indicate that the GF 9-2 core is early enough after star formation that it still retains some information of initial conditions for collapse. Our 350 μm dust continuum image identified a protostellar envelope with an extent of ≃5400 AU in the center of the molecular core ≃0.08 pc in size. The envelope mass is estimated to be ≃0.6 M☉ from the 350 μm flux density, while the LTE mass of the core is ≃3 M☉ from molecular lines. We found that the core has a radial density profile of ρ(r) ∝ r-2 for the 0.003 ≲ r/pc ≲ 0.08 region and that the velocity width of the core gas increases inward, while the outermost region maintains a velocity dispersion of a few times the ambient sound speed. If we interpret the broadened velocity width as infall, the core collapse can be well described by an extension of the Larson-Penston solution for the period after formation of a central star. We derived the mass accretion rate of ≃3 × 10-5 M☉ yr-1 from infall velocity of ≃0.3 km s-1 at r ≃ 7000 AU. Furthermore, we found evidence that a protobinary is being formed at the core center. All of the results suggest that the GF 9-2 core has been undergoing gravitational collapse for ≲5000 yr since the protostar formation and that the unstable state initiated the collapse ≃2 × 105 yr (the free-fall time) ago." @default.
• W1988886686 created "2016-06-24" @default.
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• W1988886686 date "2006-12-20" @default.
• W1988886686 modified "2023-09-27" @default.
• W1988886686 title "The Initial Conditions for Gravitational Collapse of a Core: An Extremely Young Low‐Mass Class 0 Protostar GF 9‐2" @default.
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• W1988886686 doi "https://doi.org/10.1086/508405" @default.
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