Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0720w&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #07.20; Bulletin of the American Astronomical Society, Vol. 29, p.1221
Astronomy and Astrophysics
Astronomy
Scientific paper
We have discovered and mapped a compact (~ 80('') in extent) outflow from the gas-rich protostar, S68N, with newly combined single-dish (Haystack) and interferometer (BIMA) data. The outflow momentum flux is ~ 4.8 x 10(-4) Msun 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->1 results, combined with previous H_2CO data, suggest the simultaneous occurrence of infall and outflow in S68N (Hurt, Barsony, & Wootten 1996; McMullin et al. 1994). We have also mapped the S68N region at 450 mu m & 850 mu m, with SCUBA on the JCMT with 7('') and 14('') 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('') to the East. We have discovered a new protostellar source 13('') to the NE of S68N, but only marginally detected a previously known 1.1 mm continuum peak, associated with submillimeter H_2CO emission, 27('') NW of S68N (Casali, Eiroa, & Duncan 1993; Barsony, Wootten, & Hurt, unpublished data). This 1(') 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.
Alwyn Wootten H.
Barsony Mary A.
Kastner Joel H.
Lowrance Patrick James
McMullin Joseph Peter
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