The ALMA-PILS survey: Stringent limits on small amines and nitrogen-oxides towards IRAS 16293–2422B

N. F. W. Ligterink; H. Calcutt; A. Coutens; L. E. Kristensen; T. L. Bourke; M. N. Drozdovskaya; H. S. P. Müller; S. F. Wampfler; M. H. D. van der Wiel; E. F. van Dishoeck; J. K. Jørgensen

doi:10.1051/0004-6361/201731980

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Volume 619 (November 2018)

A&A, 619 (2018) A28

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Table 1

Column densities and rotational temperatures at the one beam offset position around source B from the ALMA-PILS data.

Molecule	Chemical formula	(cm⁻²)	T_ex (K)	V_peak (km s⁻¹)
Nitric oxide	NO	(1.5–2.5) × 10¹⁶	40–150	2.5 ± 0.2
Nitrous oxide	N₂O	≥4.0 × 10^16,‡	25–350	2.5 ± 0.2
Hydroxylamine	NH₂OH	≤3.7 × 10¹⁴	100	2.7
Methanimine	CH₂NH	(6.0–10.0) × 10¹⁴	70–120	2.7 ± 0.2
Methylamine	CH₃NH₂	≤5.3 × 10¹⁴	100	2.7

Notes. All models assume LTE, a FWHM of 1 km s⁻¹ and a sourcesize of 0.′′5. ^† Upper limits are 3σ and determined for T_ex = 100 K. ^‡Due to the large uncertainty on the highest excitation temperature only the lower limit column density is given.

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