| Description |
We propose to obtain PACS and HIFI spectroscopic maps of five
outflows driven by young and heavily embedded Class 0
protostars, in selected transitions of [OI], CO and H2O. These
species represent the main coolants of the warm (T virgul 100-2000 K)
and dense (10^4 cm^{-3}-10^6 cm^{-3}) shocked gas that gives rise to most of the
radiative luminosity of these systems.
The immediate objectives of the proposed observations will be:
1) to detect, through a map of the [OI]63um line, the embedded
atomic primary jet that should be responsible for the acceleration of the outflow;
2) to map the excitation structure of the molecular
warm gas component and understand its role in the dynamics of the system;
3)to derive the spatial variations, as a function of the central source,
of the H2O abundance and O/H2O abundance ratio, that will be
tracing time-dependent chemical changes during the flow life-time.
In order to maximize the scientific return from this program,
we have selected sources that will be already mapped in
the H2O 557 GHz line within the WISH Key Program.
If added to the ground-based and space-borne spectral maps already available
for the selected objects, the proposed Herschel observations will represent
the first multi-wavelength spatial study of protostellar outflows covering the complete
spectral domain of emission (from NIR to mm) of these objects. Such a data-base has a strong
legacy value for both future missions and development of theoretical
models and numerical simulations of shocks and outflows. |
| Publication |
Oxygen budget in low-mass protostars: the NGC 1333-IRAS4A R1 shock observed in [O I] at 63 μm with SOFIA-GREAT . Kristensen L. E. et al. . Astronomy & Astrophysics, Volume 601, id.L4, 5 pp. . 601 . 10.1051\/0004-6361\/201630310 . 2017A&A...601L...4K ,
[O I] 63 μm Jets in Class 0 Sources Detected By Herschel . Nisini B. et al. . The Astrophysical Journal, Volume 801, Issue 2, article id. 121, 14 pp. (2015). . 801 . 10.1088\/0004-637X\/801\/2\/121 . 2015ApJ...801..121N ,
Water distribution in shocked regions of the NGC 1333-IRAS 4A protostellar outflow . Santangelo G. et al. . Astronomy & Astrophysics, Volume 568, id.A125, 12 pp. . 568 . 10.1051\/0004-6361\/201424034 . 2014A&A...568A.125S ,
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