Full interferometric map of the L1157 southern outflow: Formamide (NH2CHO) can form in the gas, after all

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Volume 692 (December 2024)

A&A, 692 (2024) A120

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Table 2

Molecular column densities of acetaldehyde and formamide and their abundance ratios derived in B0, B1, and B2.

Position	Age^(a)	$N_{{CH}_{3} CHO}$ ${N_{{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHO}}}}$	$N_{{NH}_{2} CHO}$ ${N_{{\rm{N}}{{\rm{H}}_{\rm{2}}}{\rm{CHO}}}}$	$X_{{CH}_{3} CHO}$ ${X_{{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHO}}}}$	$X_{{NH}_{2} CHO}$ ${X_{{\rm{N}}{{\rm{H}}_{\rm{2}}}{\rm{CHO}}}}$	$\frac{[{CH}_{3} CHO]}{[{NH}_{2} CHO]}$ ${{\left[ {{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHO}}} \right]} \over {\left[ {{\rm{N}}{{\rm{H}}_{\rm{2}}}{\rm{CHO}}} \right]}}$
	(yr)	(10¹³ cm⁻²)	(10¹² cm⁻²)	(10⁻⁸)	(10⁻¹⁰)
		T_ex = 10 K

B0	900	2.8 ± 0.6	1.1 ± 0.2	1.4 ± 0.3	5.6 ± 1.2	25 ± 6
B1	1500	2.5 ± 0.6	1.8 ± 0.3	1.3 ± 0.3	9.4 ± 1.4	13±3
B2	2300	2.2 ± 0.5	2.9 ± 0.4	1.1 ± 0.3	15±2	8±2

		Tex = 20 K

B0	900	3.4 ± 0.7	1.9 ± 0.4	1.7 ± 0.4	9.4 ± 2.0	18±5
B1	1500	3.1 ± 0.7	3.2 ± 0.5	1.5 ± 0.3	16±2	10±2
B2	2300	2.7 ± 0.7	4.9 ± 0.6	1.3 ± 0.3	25 ± 3	5±1

Notes. The column densities are given assuming LTE and for T_ex = 10, 20 K (see Mendoza et al. 2014; Lefloch et al. 2017; Codella et al. 2020). Their errors are due to the flux calibration uncertainty (10%) and the noise RMS of the associated integrated-intensity maps. ^(a)Time since the passage of the shock from Podio et al. (2016), corrected for the most recent distance estimate (Zucker et al. 2019) and rounded to the closest hundred.

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