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Session 7 - Molecular Clouds.
Display session, Wednesday, January 07
Exhibit Hall,

[7.20] Cluster Birth: New SCUBA and CS Results in S68N

G. A. Wolf-Chase, M. A. Barsony (U.C. Riverside), H. A. Wootten (NRAO, Charlottesville), D. Ward-Thompson (Royal Obs., Edinburgh), P. J. Lowrance (UCLA), J. H. Kastner (MIT), J. P. McMullin (NRAO, Green Bank)

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submillimeter H_2CO emission, 27^\prime\prime NW of S68N (Casali, Eiroa, amp; Duncan 1993; Barsony, Wootten, amp; Hurt, unpublished data).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.

Program listing for Wednesday