First detection of radio recombination lines of ions heavier than helium

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Table 2.

Model parameters of RRLs.

	Region	EM	V_LSR⁽¹⁾	ΔV
		(cm⁻⁶ pc)	(km s⁻¹)	(km s⁻¹)
H	M 42 (Orion KL)	1.46×10⁶	−4	25
He	M 42 (Orion KL)	1.46×10⁵	−4	17.5
C II(O II)	M42 (Orion KL)	1.29×10³	−5.5(−2)	15
C ⁽²⁾	PDR	1.80×10²	8	5
H	M 42 (θ¹ Ori C)	1.7×10⁶	0	24
He	M 42 (θ¹ Ori C)	1.7×10⁵	0	16.5
C II(O II)	M 42 (θ¹ Ori C)	1.48×10³	−3.5(0)	17

Notes.

⁽¹⁾

The values in the brackets are for O II.

⁽²⁾

A T_e of 300 K is adopted for carbon RRLs from PDRs.

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