Parker, N. D.; White, Glenn J.; Hayashi, S. S. and Williams, P. G.
(1991).
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| URL: | http://adsabs.harvard.edu/abs/1991A%26A...250..134... |
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Abstract
We present high-resolution observations of the 12CO J = 3-2 emission associated with HH102 in the L1551 molecular outflow. At low and intermediate blue-shifted velocities the emission is found in a shell which coincides with the optical reflection nebulosity from HH102. In places, the shell appears to be unresolved, implying a width of less than ~ 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, we derive excitation temperatures and beam-filling factors for these clumps. The gas is found to be hot (up to ~ 40 K) and often has low filling factor (~ 0.2). We compare the distribution of the CO emission with those of the optical reflection nebulosity and the Hα shocked emission. The data are consistent with a fast wind from IRS5 being shocked immediately in front of the boundary between the wind-eroded cavity and the swept-up molecular gas. We suggest that the particularly energetic activity in the vicinity of HH102 is a result of the direct impact of material in a fast, collimated jet such as those traced by the radio jets emanating from IRS5. If so, previous interpretations of the presence of both red- and blue-shifted CO around HH102 may be incorrect. In particular, the data need not be explained as solely due to the presence of a slow rotation of the outflow about its axis.
| Item Type: | Article |
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| Copyright Holders: | 1991 European Southern Observatory |
| ISSN: | 1432-0746 |
| Keywords: | carbon monoxide; Herbig-Haro objects; interstellar gas; molecular clouds; star formation; stellar envelopes; early stars; gas flow |
| Academic Unit/School: | Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM) |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 33338 |
| Depositing User: | G. J. White |
| Date Deposited: | 25 May 2012 09:23 |
| Last Modified: | 29 Nov 2016 16:55 |
| URI: | http://oro.open.ac.uk/id/eprint/33338 |
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