The B1 shock in the L1157 outflow as seen at high spatial resolution M. Benedettini, S. Viti, C....
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Transcript of The B1 shock in the L1157 outflow as seen at high spatial resolution M. Benedettini, S. Viti, C....
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)