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Session 7 - Molecular Clouds.
Display session, Wednesday, January 07
Exhibit Hall,
We have discovered and mapped a compact (\approx 80^\prime\prime in extent) outflow from the gas-rich protostar, S68N, with newly combined single-dish (Haystack) and interferometer (BIMA) data. The outflow momentum flux is \approx 4.8 \times 10^-4 M_ødot km s^-1 yr^-1, or about two orders of magnitude larger than the average momentum flux for Class I objects, and one order of magnitude larger than the average momentum flux for Class 0 objects (e.g., Bontemps et al. 1996). Such a high momentum flux is a newly-found indicator of the extreme youth of Class 0 protostars. Our new CS J=2\rightarrow1 results, combined with previous H_2CO data, suggest the simultaneous occurrence of infall and outflow in S68N (Hurt, Barsony, amp; Wootten 1996; McMullin et al. 1994).
We have also mapped the S68N region at 450 \mum amp; 850 \mum, with SCUBA on the JCMT with 7^\prime\prime and 14^\prime\prime resolutions, respectively. In addition to S68N, the SCUBA maps also detect swept-up dust associated with the redshifted outflow lobe, as well as the Class I source, SMM5, 45^\prime\prime to the East. We have discovered a new protostellar source 13^\prime\prime to the NE of S68N, but only marginally detected a previously known 1.1 mm continuum peak, associated with submillimeter H_2CO emission, 27^\prime\prime NW of S68N (Casali, Eiroa, amp; Duncan 1993; Barsony, Wootten, amp; Hurt, unpublished data). This 1^\prime region surrounding S68N in the Serpens cloud core (d=310 pc) contains a pre-protostellar core, a possible proto-binary, and a Class I protostar. We plan future line radiative transfer modelling, combined with higher resolution interferometric imaging of this source, to advance our understanding of cloud fragmentation processes leading to multiple system formation.
