Observational evidence for dissociative shocks in the inner 100 AU of low-mass protostars using Herschel-HIFI

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Table 4

H₂O and CO excitation conditions.

Source	n(H₂)	N(H₂O)^a	N(CO)^a	T_kin^b	r
	(cm^-3)	(cm^-2)	(cm^-2)	(K)	(AU)


IRAS 2A	5 × 10⁶	4 × 10¹⁶		750	80
IRAS 4A	5 × 10⁶	1 × 10¹⁶		750	140
IRAS 4B	1 × 10⁷	4 × 10¹⁵		750	160
SMM1	5 × 10⁶	4 × 10¹⁶	1 × 10¹⁸	750	110
SMM3	5 × 10⁷	1 × 10¹⁶		750	50

Notes.

^(a)

Column density over the emitting region with radius r.

^(b)

Kinetic temperature fixed in the model.

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