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The B1 shock in the L1157 outflow as seen at high spatial
resolutionM. Benedettini, S. Viti, C. Codella, F. Gueth, A. Gomez-Ruiz, R. Bachiller, M. Beltran, G. Busquet, C. Ceccarelli, B. Lefloch
Accepted by MNRAS
Herscehl, CHESS meeting Roma, 11-13 September 2013
Benedettini et al. 2006
3 mm data
Plateau de Bure 2 mm data
Codella et al. 2009
Multi-velocity components along some clumps
Compact (3”-6”) high velocity clumps
B0e-HV2 v= -16 km/s
B1a-HVv= -12 km/s B1b-HV
v= -4 km/s
B0e-HV1 v= -6 km/s
Comparison between PdB spectrum (blue) and IRAM-30m spectrum (black)
CS (2-1) CS (3-2)
Flux filtering at all velocity No filtering for v<6 km/s
Largest sensible structure 14 ” HV clumps do not suffer flux filtering
LVG modeling of CS (2-1) and (3-2) of HV clumps
Constraint of the gas density!
5x103 ≤n(H2)≤ 5x105 cm3
T= 55 -132 K from Codella et al. 2009
Chemical modelChemical code (UCL_CHEM, Viti et al. 2004)
+
parametric C-type shock (Jimenez-Serra 2008)
Pre-shock density >104 cm3
30 % of CO depleted in grain during the core formation
Maximum shock temperature ~ 4000 K that implies shock velocity 40 km/s
Used by Viti et al 2011 for modelling H2O and NH3
5”
Possible direction of the jetB0e-
HV2B0e-HV2
B0e-HV1
B0e-HV1
CS (3-2) first moment
Outflow cavity
Outflow cavity
On the origin of the HV clumps
• external clumps pushed by the expanding outflow cavity?
• clumps produced by the shock?
• the jet? VLA proposal to detect the radio jet (Busquet et al)