bipolar outflows are a basic ingredient in the process of star formation. the extremely-high-velocity (ehv) molecular flows are particularly interesting, since they represent the *youngest* stage of the bipolar outflow phenomenon. such young outflows are associated with the youngest (proto)stellar objects known so far, and are still deeply embedded in the parent molecular clouds. shock waves generated by the outflowing motions are the origin of highly-excited neutral (or weakly ionized) gas that is best observed in the infrared. in fact, the most important cooling lines are expected to occur in the wavelength range of the iso spectrometers. we propose to obtain high-sensitivity spectra toward prototypical young molecular outflows. full grating spectra will be obtained toward the most important sources (l1157, iras2005, and ic348). moreover, since young outflows exhibit ehv molecular lines of about 100 to 200 km/s, a study or their kinematics is possible with the iso instruments. thus, we propose to obtain high-spectral resolution (fp) observations of some key cooling lines ([oi], [cii]) toward some positions carefully selected from our previous molecular (mm, near-ir) studies. the proposed observations complement the iso central programme observations which are mainly addressing much more evolved, bipolar outflows (similar to l1551). the iso observations of the youngest outflows proposed here are expected to provide important insights in the processes of star formation, and will be very important for the understanding of the genesis and evolution of bipolar outflows in general.
Instrument
LWS01 , SWS01
Temporal Coverage
1996-08-24T16:04:14Z/1997-04-25T10:58:47Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1999, The Bipolar Outflows From The Youngest Stellar Objects Infrared Spectroscopy, 1.0, European Space Agency, https://doi.org/10.5270/esa-1vkbnin
