Formic acid isomerism in dark clouds - Detection of cis-formic acid in TMC-1 with the QUIJOTE line survey and astrochemical modeling

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Volume 703 (November 2025)

A&A, 703 (2025) A164

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Table 1

Observed line parameters of c/t-FA in TMC-1.

Molecule	Transition	ν_calc (MHz)	E_up (K)	$T_{A}^{}$ $\[T_{A}^{}\]$ peak (mK)	Δv^a (km s⁻¹)	V_LSR (km s⁻¹)	$\int T_{A}^{} d v$ $\[\int T_{A}^{} d v\]$ (mK km s⁻¹)
t-HCOOH	2_1,2–1_1,1	43303.710	6.3	3.94 ± 0.12	0.88 ± 0.03	5.87 ± 0.01	3.70 ± 0.01
t-HCOOH	2_0,2–1_0,1	44911.740	3.2	8.04 ± 0.14	0.92 ± 0.03	5.87 ± 0.01	7.83 ± 0.10
t-HCOOH	2_1,1–1_1,0	46581.226	6.5	4.12 ± 0.19	0.84 ± 0.03	5.88 ± 0.01	3.70 ± 0.12
c-HCOOH	2_1,2–1_1,1	42541.400	6.7	−	−	−	−^b
c-HCOOH	2_0,2–1_0,1	43926.482	3.2	1.78 ± 0.16	0.87 ± 0.08	6.01 ± 0.04	1.64 ± 0.14
c-HCOOH	2_1,1–1_1,0	45351.360	6.9	−	−	−	−^b

Notes. The line parameters $T_{A}^{*}$ $\[T_{A}^{*}\]$ peak, Δv, V_LSR, and $\int T_{A}^{*} d v$ $\[\int T_{A}^{*} d v\]$ and the associated errors are derived from a Gaussian fit to each line profile. ^a Δv is the FWHM. ^b This line is only marginally detected. No fit was attempted.

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