Submillimeter spectra of 2-hydroxyacetonitrile (glycolonitrile; HOCHCN) and its searches in GBT PRIMOS observations of Sgr B2(N)

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Table 5

Upper limits to HOCH₂CN column density in PRIMOS, IRAM, and Herschel HEXOS observations toward Sgr B2(N) for several common conditions.

T_r (K)	Source size (′′)	Upper limit column density (cm^-2)

8	20	8 × 10¹²
18	20	8 × 10¹³
26^b	200^b	2 × 10¹³
80	5	2 × 10¹⁵
130	5	4 × 10¹⁵
200	5	8 × 10¹⁵
200^b	200^b	7 × 10¹⁴

Notes.

^(a)

We estimate the uncertainties in the upper limits to be ~30%, largely arising from absolute flux calibration and pointing uncertainties.

^(b)

Values were chosen for comparison to CH₃NCO detection from Halfen et al. (2015) and Cernicharo et al. (2016). A source size of 200′′ follows the assumption that the source completely fills the beam.

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