Abundance anomaly of the 13C species of CCH | Astronomy & Astrophysics (A&A)

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Table 2:

The column densities of CCH and its ¹³C isotopic species.
Model	Species	TMC-1	L1527
		[cm^-2]	[cm^-2]
LVG^a	CCH	$(6.5 \pm 2.7) \times 10^{14}$	$(9.8 \pm 0.2) \times 10^{14}$
	C¹³CH	$(3.9 \pm 0.4) \times 10^{12}$	$(1.2 \pm 0.1) \times 10^{13}$
	¹³CCH	$(2.6 \pm 0.4) \times 10^{12}$	$(7.3 \pm 0.8) \times 10^{12}$
LTE^b	CCH	$(5.4 \pm 0.1) \times 10^{14}$	$(8.1^{+0.1}_{-0.2}) \times 10^{14}$
$\quad$	C¹³CH	$(3.4^{+0.5}_{-0.7}) \times 10^{12}$	$(9.3 \pm 0.7) \times 10^{12}$
$\quad$	¹³CCH	$(2.1 \pm 0.5) \times 10^{12}$	$(5.7 \pm 0.3) \times 10^{12}$

Notes. The errors quoted represent three times the standard deviation. ^(a) The H₂ densities and the gas kinetic temperatures are assumed to be $3 \times 10^4$ and 10 K, $1 \times 10^6$ cm^-3 and 15 K, for TMC-1 and L1527, respectively. ^(b) The excitation temperatures are assumed to be 6.7 K and 12.3 K for TMC-1 and L1527, respectively.

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