Methyl cyanide as tracer of bow shocks in L1157-B1

C. Codella; M. Benedettini; M. T. Beltrán; F. Gueth; S. Viti; R. Bachiller; M. Tafalla; S. Cabrit; A. Fuente; B. Lefloch

doi:10.1051/0004-6361/200913340

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Volume 507 / No 2 (November IV 2009)

A&A, 507 2 (2009) L25-L28

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Table 1:

The L1157-B1 clumps: CH₃CN rotational temperatures, and CH₃CN and CH₃OH column densities.
Clump	$T_{\rm rot}$	$N_{\rm CH_3CN}$	$N_{\rm CH_3OH}$ ^a	[CH₃CN]/[CH₃OH]
	(K)	(cm^-2)	(cm^-2)	(10^-3)
B0e	57	8 $\times$ 10¹²	6 $\times$ 10¹⁵	1.3
B0f	-^b	-^b	-^a	-
B1a	67	1 $\times$ 10¹³	4 $\times$ 10¹⁶	0.3
B1b	73	1 $\times$ 10¹³	5 $\times$ 10¹⁶	0.2
B1c	132	2 $\times$ 10¹³	4 $\times$ 10¹⁶	0.5
B1e	92	4 $\times$ 10¹³	-^a	-
B1f	55	2 $\times$ 10¹³	-^a	-

^a From Paper I: B0f, B1e, and B1f not identified; ^b only the K = 0 and 1 components are clearly detected.

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