Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.......161g&link_type=abstract
Ph.D. Thesis (University of Kent at Cantebury), p.109, (1994)
Other
2
Scientific paper
This thesis presents observations of two contrasting star forming molecular clouds, L1630 and G34.3+0.2, at millimetre and submillimetre wavelengths. L1630 is highly clumped and the regions studied are probably forming stars of low-- to intermediate--mass. G34.3+0.2 is a group of at least four HII regions indicating that stars of predominantly high--mass are forming in this molecular cloud. Six of 42 clumps identified in the CS survey of L1630 by Lada, Bally & Stark (1991 -- LBS) have been observed in J = 1--0, 3--2, 4--3 HCO+ and 5--4 CS. From the 3--2 and 4--3 HCO+ data, 22 maxima have been detected, 14 of which are associated with just two of the LBS `clumps'. Most of these maxima are unresolved with 14--20'' resolution, and some are associated with known infrared sources. LBS23 (incorporating HH24--26) has been studied in more detail with complete maps made in CS and 4--3 HCO+ and while the CS and HCO+ have similar distributions, both exhibit significant spatial anti--correlation with NH3. Three molecular outflows have been mapped in HH24--26 and LBS17 using 2--1 CO and 3--2 HCO+. The molecular cloud associated with the HII region G34.3+0.2 has been observed in 13CO J = 2--1, 3--2, 6--5, C18O 2--1 and CI 3P1 -- 3P0. In contrast to L1630, G34.3+0.2 appears as a single central maximum, with little evidence of small--scale clumping. Most of the lines show evidence of absorption, which is strongest at the centre of the HII regions. The emission also peaks at this position, but at least two other centres of activity are present within the cloud, not seen in previous maps. The emission of the CO and CI lines has been modelled using a spherically symmetric, non--LTE radiative transfer program. This model successfully reproduces the observed line intensities and shapes and predicts angular diameters which are in reasonable agreement with those observed.
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