Two Bipolar Outflows and Magnetic Fields in the Multiple Protostar System L1448 IRS 3

We performed spectral line observations of CO J=2-1, 13CO J=1-0, and C18OJ=1-0 and polarimetric observations in the 1.3 mm continuum and CO J=2-1 towarda multiple protostar system, L1448 IRS 3, in the Perseus molecular complex at adistance of ~250 pc, using the BIMA array. In the 1.3 mm continuum, two sources(IRS 3A and 3B) were clearly detected with estimated envelope masses of 0.21and 1.15 solar masses, and one source (IRS 3C) was marginally detected with anupper mass limit of 0.03 solar masses. In CO J=2-1, we revealed two outflowsoriginating from IRS 3A and 3B. The masses, mean number densities, momentums,and kinetic energies of outflow lobes were estimated. Based on those estimatesand outflow features, we concluded that the two outflows are interacting andthat the IRS 3A outflow is nearly perpendicular to the line of sight. Inaddition, we estimated the velocity, inclination, and opening of the IRS 3Boutflow using Bayesian statistics. When the opening angle is ~20 arcdeg, weconstrain the velocity to ~45 km/s and the inclination angle to ~57 arcdeg.Linear polarization was detected in both the 1.3 mm continuum and CO J=2-1. Thelinear polarization in the continuum shows a magnetic field at the centralsource (IRS 3B) perpendicular to the outflow direction, and the linearpolarization in the CO J=2-1 was detected in the outflow regions, parallel orperpendicular to the outflow direction. Moreover, we comprehensively discusswhether the binary system of IRS 3A and 3B is gravitationally bound, based onthe velocity differences detected in 13CO J=1-0 and C18O J=1-0 observations andon the outflow features. The specific angular momentum of the system wasestimated as ~3e20 cm^2/s, comparable to the values obtained from previousstudies on binaries and molecular clouds in Taurus.Comment: ApJ accepted, 20 pages, 2 tables, 10 figure