Tentative detection of the glycine isomer glycolamide in a hot molecular core

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Volume 709 (May 2026)

A&A, 709 (2026) A93

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Table 1

Molecular parameters derived from LTE fits using CLASS, and corresponding abundances relative to H₂.

Species	T_ex (K)	N_t (10¹⁴ cm⁻²)	$χ H_{2}^{a} (10^{- 10})$ $Mathematical equation: $\chi {{\rm{H}}_2}^{\rm{a}}({10^{ - 10}})$$
NH₂CHO^b	124±25	18.8±3.8	2.4±0.7
NH₂CHO^c	–	170.8±45.4	21.9±6.2
${NH}_{2}^{13} CHO$ $Mathematical equation: ${\rm{N}}{{\rm{H}}_2}^{13}{\rm{CHO}}$$	112±22	6.1±1.2	0.8±0.2
CH₃C(O)NH₂	171±34	88.1±17.6	11.3±3.1
syn-HOCH₂C(O)NH₂	102±20	5.3±1.1	0.7±0.2

Notes.^a Molecular abundances relative to H₂. The adopted N(H₂) and its derivation are described in Appendix E.^b “Best-fit column density of NH₂CHO” refers to the parent isotopolog; optical-depth effects are discussed in the text.^c To mitigate the optical-depth effects, the NH₂CHO column density was derived from ${NH}_{2}^{13} CHO$ $Mathematical equation: ${\rm{NH}}_2^{13}{\rm{CHO}}$$ , scaled by the ratio ¹²C/¹³C = 28±5 (Yan et al. 2023).

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