Probing the embedded molecular jets from Class 0 protostars

Details Probing the embedded molecular jets from Class 0 protostars Probing the embedded molecular jets from Class 0 protostars

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20155n&link_type=abstract

Spitzer Proposal ID #20155

Physics

Scientific paper

Flows of matter from young and heavily embedded ``Class 0'' protostars are often observed only at millimeter wavelengths in the form of collimated molecular jets. An important open debate is whether such jets represent the cold external layer of an embedded atomic jet, or whether the jet itself is intrinsically composed of only molecular gas under low excitation conditions. The aim of this proposal is to obtain insight into the composition and excitation of such jets through IRS observations of mid-IR lines, which are unique tracers of the warm embedded gas components. The immediate objectives will be: 1) to detect the atomic/ionic component associated with Class 0 molecular jets; 2) to derive detailed physical quantities (temperature, density, ionization fraction) to be compared with models for acceleration and propagation of jets, models which have so far only been tested on more evolved CTT stars; 3) to determine if such jets have sufficient momentum and energy to sustain the swept up gas seen further out in the form of near-IR bow shocks. To this aim, a sample of four well-known Class 0 jets have been selected for which near-IR, millimeter and ISO observations are already available. This will ensure a thorough comparison of the different jet excitation components which should ultimately be explained in a unified flow model.

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