Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...479l..63y&link_type=abstract
Astrophysical Journal Letters v.479, p.L63
Astronomy and Astrophysics
Astronomy
7
Ism: Individual Alphanumeric: Vla 1623, Ism: Jets And Outflows, Stars: Formation, Techniques: Interferometric
Scientific paper
We present 12CO J = 1--0 and H13CO+ J = 1--0 observations of the spectacular VLA 1623 outflow that were obtained with the Berkeley-Illinois-Maryland Association (BIMA) interferometer at resolutions of 12."3 x 4."4 and 9."7 x 6."9, respectively. The 12CO outflow image reveals a clumpy, nonlinear morphology akin to optical jet outflows and Herbig-Haro objects. We identify partially unresolved CO clumps labeled A through H, of which only A and F have associated lambda = 2.121 mu m H2 emission. One of the two 6 cm continuum sources in the region, VLA 1623E, coincides with CO clump C. The dense ambient gas probed by H13CO+ shows no correlation with the dust continuum peaks in the region, interpreted as evidence of gas-phase depletion onto dust grains. We argue that the H13CO+ peak, which coincides with a water maser, traces the interaction between the outflow and dense gas in the protostellar core. The fractional abundance there is given by X[H13CO+] ~ 3 x 10-10. The nondetections of H13CN, SO, and SiO allow limits to be placed on their relative abundances at the H13CO+ peak.
Chernin Lawrence M.
Yu Tianhong
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