High resolution CO J = 3-2 observations of L 1551 - Fragmentary structure in the outflowing shell

Details High resolution CO J = 3-2 observations of L 1551 - Fragmentary structure in the outflowing shell High resolution CO J = 3-2 observations of L 1551 - Fragmentary structure in the outflowing shell

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..134p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 134-142.

Astronomy and Astrophysics

Astrophysics

9

Carbon Monoxide, Herbig-Haro Objects, Interstellar Gas, Molecular Clouds, Star Formation, Stellar Envelopes, Early Stars, Gas Flow

Scientific paper

High-resolution observations of the (C-12)O J = 3-2 emission associated with HH 102 in the L 1551 molecular outflow are presented. At low and intermediate blue-shifted velocities the emission is found in a shell which coincides with the optical reflection nebulosity from HH 102. In places, the shell appears to be unresolved, implying a width of less than about 0.01 pc. Within the shell several bright clumps can be identified. By combining the J = 3-2 data with previous J = 1-0 maps, excitation temperatures and beam-filling factors for these clumps are derived. The gas is found to be hot (up to about 40 K) and often has low filling factor (about 0.2). The distribution of the CO emission is compared with those of the optical reflection nebulosity and the H-alpha shocked emission. The data are consistent with a fast wind from IRS 5 being shocked immediately in front of the boundary between the wind-eroded cavity and the swept-up molecular gas. It is suggested that the particularly energetic activity in the vicinity of HH 102 is a result of the direct impact of material in a fast, collimated jet such as those traced by the radio jets emanating from IRS 5.

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