A study of the C3H2 isomers and isotopologues: first interstellar detection of HDCCC

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Table 7

Isomeric and D/H ratios of H₂CCC and c-C₃H₂ in six Galactic regions.

Property	Prestellar core		Protostellar core		Dark cloud	Translucent^a	Diffuse^b	PDR^c

	TMC-1C	L1544	L1527^d	Cha-MMS1^e	TMC-1	(Average)	(Mean)

N(c-C₃H₂) cm^-2	2.2^h×10¹³	3.7^h×10¹³	1.3 × 10¹³	2.7 × 10¹³	0.58^g × 10¹⁴	2.4 × 10¹³	3.3 × 10¹²	9.3 × 10¹²
N(H₂CCC) cm^-2	3.3 × 10¹¹	1.1 × 10¹²	1.1 × 10¹²	···	(2.1^g - 3.1) × 10¹²	2.5 × 10¹²	1.9 × 10¹¹	2.7 × 10¹²

c-C₃H₂/H₂CCC	67 ± 7 ^f	32 ± 4	12	···	28 ± 6^g	9	17	3
c-C₃HD/c-C₃H₂	(5−13)%^h 10%ⁱ	(12−17)%^h 15%ⁱ^,^j	(7−18)%	(5−34)%	8%ⁱ 5%^k	···	···	···
c-C₃D₂/c-C₃HD	(3−15)% ^h	(7−17)% ^h	2.6% ^l	···	···	···	···	···
HDCCC/H₂CCC	19 ± 5%	6 ± 1.3%	···	···	4 ± 1.6%	···	···	···

Notes. Quantities in boldface are from this work.

Reference.

^(a)

From Table 20 in Turner (2000) and references therein.

^(b)

Liszt et al. (2012).

^(c)

Pety et al. (2012).

^(d)

From Table 1 in Sakai & Yamamoto (2013) and references therein.

^(e)

Cordiner et al. (2012).

^(f)

See Sects. 3.1 and 4.

^(g)

Fossé et al. (2001).

^(h)

Spezzano et al. (2013).

⁽ⁱ⁾

Bell et al. (1988).

^(j)

Gerin et al. (1987).

^(k)

See Table 12 in Turner (2001).

^(l)

Tokudome et al. (2013).

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