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• W4375852056 endingPage "3250" @default.
• W4375852056 startingPage "3239" @default.
• W4375852056 abstract "The ${rm H_2NC}$ radical is the high-energy metastable isomer of ${rm H_2CN}$ radical, which has been recently detected for the first time in the interstellar medium towards a handful of cold galactic sources, besides a warm galaxy in front of the PKS 1830-211 quasar. These detections have shown that the ${rm H_2CN}$/${rm H_2NC}$ isomeric ratio, likewise the HCN/HNC ratio, might increase with the kinetic temperature ($T_{rm kin}$), but the shortage of them in warm sources still prevents us to confirm this hypothesis and shed light about their chemistry. In this work, we present the first detection of ${rm H_2CN}$ and ${rm H_2NC}$ towards a warm galactic source, the G+0.693-0.027 molecular cloud (with $T_{rm kin} > 70 , {rm K}$), using IRAM 30m observations. We have detected multiple hyperfine components of the $N_{K_text{a}K_text{c}} = 1_{01} - 0_{00}$ and $2_{02} - 1_{01}$ transitions. We derived molecular abundances with respect to ${rm H_2}$ of (6.8$pm$1.3)$times 10^{-11}$ for ${rm H_2CN}$ and of (3.1$pm$0.7)$times 10^{-11}$ for ${rm H_2NC}$, and a ${rm H_2CN}$/${rm H_2NC}$ abundance ratio of 2.2$pm$0.5. These detections confirm that the ${rm H_2CN}$/${rm H_2NC}$ ratio is $gtrsim$2 for sources with $T_{rm kin} > 70 , {rm K}$, larger than the $sim$1 ratios previously found in colder cores ($T_{rm kin}sim10 , {rm K}$). This isomeric ratio dependence with temperature cannot be fully explained with the currently proposed gas-phase formation and destruction pathways. Grain surface reactions, including the ${rm H_2NC} rightarrow {rm H_2CN}$ isomerization, deserve consideration to explain the higher isomeric ratios and ${rm H_2CN}$ abundances observed in warm sources, where the molecules can be desorbed into the gas phase through thermal and/or shock-induced mechanisms." @default.
• W4375852056 created "2023-05-10" @default.
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• W4375852056 date "2023-05-08" @default.
• W4375852056 modified "2023-10-18" @default.
• W4375852056 title "H2CN/H2NC abundance ratio: a new potential temperature tracer for the interstellar medium" @default.
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• W4375852056 doi "https://doi.org/10.1093/mnras/stad1385" @default.
• W4375852056 hasPublicationYear "2023" @default.
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