Abundance of HOCO+ and CO2 in the outer layers of the L1544 prestellar core

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Table 1

Properties of the observed HOCO⁺ and DOCO⁺ lines (E_up ≤ 30 K).

Transitions	Frequency	Aij	E_up	V_peak	FWHM		rms
	(MHz)	(s^-1)	(K)	(km s^-1)	(km s^-1)	(K km s^-1)	(mK)

				HOCO⁺

4_0,4–3_0,3	85 531.51	1.29 × 10^-5	10.26	7.25 ± 0.01	0.43 ± 0.03	0.022 ± 0.004	3.2
5_0,5–4_0,4	106 913.56	2.59 × 10^-5	15.39	7.19 ± 0.02	0.34 ± 0.04	0.013 ± 0.003	4.6

				DOCO⁺

4_0,4–3_0,3	80 288.79	1.14 × 10^-5	9.63			≤0.02	5.2
5_0,5–4_0,4	100 359.55	2.28 × 10^-5	14.45	6.40 ± 0.03	0.28 ± 0.06	0.004 ± 0.001	3.5
4_1,4–3_1,3	79 776.48	1.05 × 10^-5	30.07			≤0.02	4.5

Notes. The upper limits have been computed using the rms around the line. The errors in the fluxes include the calibration and statistical uncertainties from the Gaussian fits of the lines.

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