title: High-resolution images of the L1551 bipolar outflow:  evidence for an expanding, accelerated shell.
abstract: Approximately one-half of the L1551 bipolar outflow was mapped in the J = 1-0 transition of 12CO using the FCRAO 14 m telescope.  The data were obtained by heavily oversampling over the beam area and then were reconstructed using a maximum entropy algorithm to obtain images of the high-velocity gas with an angular resolution of approximately 20".  The outflow exhibits a striking shell-like structure with the lowest velocity out-flowing gas found along the limb of the outflow, and the highest velocity outflowing gas found along the axis of the outflow.  A smooth transition is found between low-velocity emission on the periphery and high-velocity gas in the center.  Our data can be modeled by molecular material located in a thin expanding shell which is accelerating away from IRS 5.
authors.affiliation: Department of Physics and Astronomy, University of Massachusetts, USA.
authors.forename: G H
authors.initials: GH
authors.lastname: Moriarty-Schieven
authors.forename: R L
authors.initials: RL
authors.lastname: Snell
authors.forename: S E
authors.initials: SE
authors.lastname: Strom
authors.forename: F P
authors.initials: FP
authors.lastname: Schloerb
authors.forename: K M
authors.initials: KM
authors.lastname: Strom
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D002248:Carbon Monoxide / Q000737:chemistry*; D005118:Extraterrestrial Environment; D008962:Models, Theoretical; D013057:Spectrum Analysis; D014919:Wind
chemical_list: D002248:Carbon Monoxide