Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30849b&link_type=abstract
Spitzer Proposal ID #30849
Computer Science
Scientific paper
IRAS 16253-2429 is a newly discovered Class 0 protostar in the nearby Rho Ophiuchi molecular clouds. Ground-based imaging tracing its 2.12 micron H2 emission and CO(3-2) molecular line maps reveal its bipolar, molecular outflow. The IRAC images from the Spitzer archive show a beautiful, bipolar hourglass structure, tracing the outflow cavities, in addition to shock features from the flow. The requested IRS scan mapping is necessary to separate the pure shocked molecular line emission associated with the flow, from the scattered dust continuum emission of the cavity, and from the PAH (polycyclic aromatic hydrocarbon) feature emission found throughout the Rho Oph clouds. Hydrodynamic jet models , including molecular chemistry and cooling, can then be quantitatively compared with the IRS scan maps to infer jet characteristics, such as the presence of an underlying pulsed, continuous, and/or precessing jet. The uniqueness of IRAS16253-2429 stems from the fact that its infall envelope is seen in absorption against the bright background PAH emission of its parent cloud, which is backlit by the FUV/UV light of the Sco OB2 association. This means we can derive the infallenvelope's density distribution (at multiple wavelengths, with IRS scan mapping), as well as the outflow cavities' density distributions at the highest spatial resolution ever achieved for a Class 0 protostar. The derived envelope density distribution will then serve as input for hydrodynamic models of jet-driven and wide-angled wind driven cavities. The predicted cavity density distributions from these models will then be quantitatively compared with the observations to infer the nature of the driving wind/jet at this very early protostellar stage.
Arce Hector
Barsony Mary
Ciardi David
Cole David
Cotera Angela
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