Table 2
MF:GA:AA isomeric abundance ratio in the ISM compared to our experimental data.
| Source | Abundance ratio | Type | Reference |
|---|---|---|---|
| ISM Gas-phase - (sub)millimeter | |||
| Orion KL - MF peak | 600:≤0.25:≤1 | Source in the hot multi-core, isolated | (1) |
| Orion KL - EG peak | 13.3:≤0.1:1 | In the hot multi-core, near to the explosion center | (1) |
| Orion KL - ET peak | 120:≤0.15:1 | In the hot multi-core, close to EG peak | (1) |
| NGC 1333 IRAS 2A | 7:≤1:N.D. | Hot corino, outflows | (6),(10) |
| NGC 1333 IRAS 4A | 63:11:≤1 | Two hot corinos, strong molecular outflow | (11), (5) |
| B1-c | 7.5:≤1:N.D. | Hot corino, high velocity outflow | (6), (15) |
| B1b-S | 36:≤1:N.D. | Very young Hot Corino | (18) |
| V883 Ori | 85:0.15:1 | Kepl. disk around an eruptive young star | (9) |
| L1157-B1 | 5.5:3.5:≤1 | Class 0 outflow shock region | (7) |
| Sgr B2(N) | 40:0.15:1 | Massive star-forming region, own UC HII region | (14) |
| W51∕e2 | 37:≤0.1:1 | High-Mass Young Stellar Object | (16), (17), (12) |
| IRAS 16293-2422A | 60:0.3:1 | Hot corino, companion of IRAS 16293B | (3) |
| IRAS 16293-2422B | 10:4.5:1 | Hot corino, companion of IRAS 16293A | (2) |
| G31.41+0.31 | 2.75:0.06:1 | HMC: multi high-mass protostar, near HII region | (4) |
| G34.3+0.2 | 27:≤0.15:1 | Massive star-forming region, own UC HII region | (13), (16) |
| NGC 6334I MM1-i | 21:1.5:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334IMM1-ii | 33:2.5:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM1-iii | 10:0.75:1 | Source (MM1) near HC HII region | (5), (8) |
| NGC 6334I MM1-iv | 88:2.5:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM1-v | 6:0.15:1 | Source (MM1): HC HII region | (5),(8) |
| NGC 6334I MM1-vi | 14:1:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM1-vii | 18:0.75:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM1-viii | 36:1:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM1-ix | 54:1.5:1 | Source in the hot multi-core MM1 | (5) |
| NGC 6334I MM2-i | 30:≤0.2:1 | Source in the hot multi-core MM2 | (5) |
| NGC 6334I MM2-ii | 16:≤0.15:1 | Source in the hot multi-core MM2 | (5) |
| NGC 6334I MM2-iii | 27:≤0.1:1 | Source in the hot multi-core MM2 | (5) |
| ISM Ice-phase - infrared | |||
| NGC 1333 IRAS 2A | 0.2:N.D.:1 | Hot corino, outflows | (6) |
| B1-c | 2.3:N.D.:1 | Hot corino (Class 0), high velocity outflow | (6), (15) |
| Present work | |||
| Ice at 160 K | 1.3:1:3.9 | Irradiated and heated CH3CH2OH:O2 ice | |
Notes. HMC refers to Hot Molecular Core, ≤ means molecule not detected, values presented are the upper limits determined by authors, N.D. means upper limit not determined. (1) Tercero et al. (2018), (2) Nazari et al. (2024), (3) Manigand et al. (2020), (4) Mininni et al. (2020), (5) El-Abd et al. (2019), (6) Chen et al. (2024), (7) Lefloch et al. (2017), (8) Brogan et al. (2016), (9) Jeong et al. (2025), (10) Taquet et al. (2015), (11) De Simone et al. (2020), (12) Goddi et al. (2020), (13) Remijan et al. (2003), (14) Belloche et al. (2013), (15) Rocha et al. (2024), (16) Lykke et al. (2015), (17) Remijan et al. (2002), (18) Marcelino et al. (2018).
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