New molecules in IRC +10216: confirmation of C5S and tentative identification of MgCCH, NCCP, and SiH3CN

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Table 2

Rotational temperatures and column densities.

Molecule	T_rot (K)	N (cm^-2)	Reference

C₂S	18(1)	5.0(3) × 10¹³	(1)
C₃S	44(2)	1.7(1) × 10¹³	(1)
C₄S	20 ^a	<7 × 10¹²^b	(2)
C₅S	18-44	(2−14) × 10¹²	(2)
MgCCH	20 ^a	2 × 10¹²	(2)
NCCP	20 ^a	7 × 10¹¹	(2)
SiH₃CN	39 ^a	1 × 10¹²	(2)

Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits. A source size of radius 20′′ has been adopted.

^(a)

T_rot has been fixed.

^(b)

3σ upper limit.

Reference. (1) IRAM 30-m data at λ 3, 2, and 1.3 mm. (2) This study.

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