Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..857b&link_type=abstract
Astronomy and Astrophysics, v.299, p.857
Astronomy and Astrophysics
Astrophysics
87
Stars: Formation, Ism: Individual Objects: L1448, Ism: Jets And Outflows, Ism: Molecules, Radio Continuum: Ism, Radio Lines: Ism
Scientific paper
The central region of the L1448 molecular outflow has been mapped in the CO J=1-0 line, and in the λ 2.6mm continuum, with angular resolution of 3"x 2.5"(~4x10^-3^pc at the distance of L1448, 300pc). In the mapped area, there are two partially overlapping outflows emerging from two different continuum sources (L1448/IRS3 and L1448-mm). The continuum maps are used to study the nature of the two exciting sources. The strong mm peak around L1448/IRS3 is coincident in position with the VLA cm source L1448N(B), and it likely is the source driving the outflow in the northern region. L1448-mm is at the origin of the main outflow. The spectral energy distributions confirm that both sources (L1448-mm and IRS3) are among the youngest known protostellar candidates ("Class 0" sources) New details on the structure of the L1448-mm outflow are revealed by the CO observations. Weak line emission at extremely-high velocities is detected along the jet which is at the axis of the outflow. Such emission is associated with the molecular bullets detected with single-dish telescopes. The jet is inclined at PA -21deg, and its actual jet speed is in excess of 200km/s. Limb-brightened cavities are detected at low CO velocities. The cavities have a biconical morphology, suggesting that a bipolar nebula is forming. The formation of the cavity is well explained in the frame of models for jet-driven bipolar outflows, where the jet entrains ambient molecular material through the propagation of large bow-shocks which are able to disturb the ambient gas at long transverse distances from the jet axis. A comparison of the CO data with H_2_ images at 2.12μm provides further support to this scenario. The blueshifted lobe of the L1448-mm outflow exhibits a continuous bending that can be explained as a result of direct collision of the two outflows in L1448.
Bachiller Rafael
Dutrey Anne
Guilloteau Stéphane
Martín-Pintado Jesús
Planesas Pere
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