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M. Barsony (San Francisco State University), R. Phelps (National Science Foundation)
We report the results of a new [SII] and nearby off-line, narrowband continuum imaging survey of an approximately 0.5 sq. degree area of the \rho Ophiuchi cloud core. Higher sensitivity and an improved pixel scale (0.37") over previous surveys has increased the inventory of Herbig-Haro flows in the cloud core. We report 11 independently discovered HH objects, or newly discovered components of known HH objects. Three previous candidate HH objects have been confirmed, and 7 new highly probable, and an additional 5 possible HH object candidates have been identified. The approximate number of independently driven outflows in the \rho Ophiuchi cloud core approaches 50 when the number of Herbig-Haro flows detected in the present study is combined with the number of known CO outflows. The number of outflows exceeds the number of known Class I/Class 0 objects in the same area by at least a factor of 2, leading to the conclusion that Class II and Class III objects must also be outflow drivers. There is direct evidence in these data for Class II and Class III Herbig-Haro flow drivers, although the lack of detected emission down to the sources themselves precludes definitive identification of the great majority of the driving sources.
The authors would like to acknowledge funding from the National Science Foundation that made this work possible. MB acknowledges Chandra Award AR1-2005AB and NSF grant AST-0206146.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.