Herschel CHESS discovery of the fossil cloud that gave birth to the Trapezium and Orion KL

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This article has an erratum: [https://doi.org/10.1051/0004-6361/201219416e]

Table 5

Properties of the foreground material towards OMC-2 FIR 4 and towards Orion KL.

	OMC-2 FIR 4	Orion KL^a	Orion’s Veil (A)^b	Orion’s Veil (B)^b

Species	OH⁺, H₂O⁺	OH⁺, H₂O⁺	HI, metals	HI, metals
	HF, CH⁺, C⁺	HF, C⁺
V_LSR (km s^-1)	9	9	1.3	5.3
n_H (cm^-3)	~100	~1000	300	2500
N_HI (cm^-2)	~10²¹	~10²¹	1.6 × 10²¹	3.2 × 10²¹
Thickness (pc)	6	0.5	1.3	0.5

References.

^(a)

Gupta et al. (2010), Phillips et al. (2010).

^(b)

Abel et al. (2004, 2006) and references therein.

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