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MM and subMM molecular line observations of the southwest lobe of L1551: Evidence of a shell structureObservations have been made of the southwest outflow lobe of L1551 in several millimeter and submillimeter molecular lines. Maps have been made in the J=3-2 and J=2-1 transitions of CO over areas of 7.5 by 2.5 arc minutes and 5 by 5 arc minutes respectively at UKIRT. More detailed maps have also been made in the J=2-1 CO transition over an area of about 6 by 3.5 arc minutes at the NRAO 12m telescope. Additional observations of the J=4-3 transitions of HCN, HCO(+) abd H(13)CO(+) were made at selected positions. The HC(+) J=4-3 transition was detected at several positions along the outflow axis and at the position of IRS 5. Similarly the HCN J=4-3 transition was detected at the position of IRS 5 and also at a position close to HH29. However, the J=4-3 transition of H(13)CO(+) was bit detected at the position of IRS 5 even through it was observed at the position close to HH29 with a peak corrected antenna temperature of 0.23K at a V(LSR) of 1 km s(-1). The detection of the J=4-3 transitions of both HCO(+) and H(13)CO(+) close to the position of HH29 suggest the presence of very dense gas in this region. LVG analysis of the various molecular lines observed give a kinetic temperature between 10 and 15K and a density from 10(5) to 10(6) cm(-3) at the position of IRS 5 at the ambient cloud velocity. At the position close to HH29 LVG analysis of the CO observations gives a density between 10(3) and 10(4) cm(-3) at a kinetic temperature of 25k for a V(LSR) of 0 km s(-1). To the southwest of HH29 there is a large decrease in both the linewidth and intensity of CO emission. This may be due to the interaction between the outflow and a dense clump of gas which gives rise to HH29. The maps of the CO J=3-2 and CO J=2-1 emission integrated in 3.25 km s intervals show the shell structure postulated by Snell and Schloerb (1985).
Document ID
19870005612
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rainey, R. (London Univ. United Kingdom)
White, G. J. (London Univ. United Kingdom)
Richardson, K. J. (London Univ. United Kingdom)
Griffin, M. J. (London Univ. United Kingdom)
Cronin, J. (Bath Univ. (England), United States)
Hilton, J. (London Univ. United Kingdom)
Monteiro, T. S. (Newcastle-upon-Tyne Univ. (England), United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: NASA. Ames Research Center Summer School on Interstellar Processes; Abstracts of Contributed Papers
Subject Category
Astrophysics
Accession Number
87N15045
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19870005610Collected WorksSummer School on Interstellar Processes: Abstracts of contributed papers
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