Astronomy and Astrophysics, volume 375, 40-53 (2001/8-3)
Multiple shocks around the low-luminosity protostar IRAS 16293-2422.
CASTETS A., CECCARELLI C., LOINARD L., CAUX E. and LEFLOCH B.
Abstract (from CDS):
Using the IRAM 30 m and SEST 15 m telescopes we mapped an area covering 300"x220" around IRAS 16293-2422 in the N2H+ J=1->0, H2CO J=31,3->21,2, SiO J=2->1 J=3 ->2 and J=5 ->4 molecular transitions. Five positions were also observed in the FIR, between 45µm and 200µm, with the Long Wavelength Spectrometer on board ISO, revealing only [CII] 158µm and [OI] 63µm emission. All these observations are used to reconstruct the complex morphology of the region, in which several outflows from several sources co-exist. The N2H+ line emission is strong and centered on 16293E, a recently discovered low mass and very young protostar situated South-East of IRAS 16293-2422. Only weaker N2H+ line emission is associated with the binary system IRAS 16293-2422, presumably because the gas surrounding it is warmer. In addition to the previously known North-East-South-West outflow powered by IRAS 16293-2422, we suggest the existence of a second outflow in this binary system. We also report the discovery of a North-West-South-East flow driven by 16293E. The impact of the outflows with the ambient cloud is probed by the SiO and H2CO maps, which reveal the presence of at least four, possibly six shocked regions. We discuss in some detail the nature of the shocks, deriving densities, temperatures and column densities of the shocked gas of the various observed components. We suggest that the wind and ambient shocks are probed by the high and low velocity components observed in the SiO lines. The morphology of the H2CO, SiO and [Oi] line emissions are rather different, showing almost all kind of combinations. We discuss the origin of these differences in terms of the age of the shocks, the pre-shock densities and of the composition of the ices which are partially desorbed by the shocks.
ISM: abundances - ISM: individual: IRAS 16293-2422 - ISM: molecules - stars: formation
Fig.2: [CCL2001] HEN (Nos HE1, HE2).
In ref list 1996A&A.315L.181L instead of 1996A&A.315.181L.
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