Table 3.
PO/PN ratios in NGC 253 and several regions in our Galaxy.
| Source | [PO/PN] | [PH3/PN] | Region type |
|---|---|---|---|
| Extragalactic | |||
| NGC 253 – GMC 4 | < 1.7 | < 5.2 | EGMC |
| NGC 253 – GMC 6 | < 1.3 | < 2.7 | EGMC |
| Galactic Centre | |||
| G+0.693−0.027 (1) | 1.5±0.4 | – | GCMC |
| S+0.24+0.01 (1) | < 2.7 | – | GCMC |
| M−0.02−0.07 (1) | < 3.1 | – | GCMC |
| SgrB2 N (1) | < 1.8 | – | MSFR |
| < 3.2 | – | ||
| SgrB2 M (1) | < 6.8 | – | MSFR |
| < 3.5 | – | ||
| Galactic disk star-forming regions | |||
| AFGL5142 P1 (2) | < 1.1 | – | MSFR |
| AFGL5142 P2 (2) | 0.6 ± 0.2 / 1.8 | – | MSFR |
| AFGL5142 P3 (2) | 1.4 ± 0.3 / 3.3 | – | MSFR |
| AFGL5142 P4 (2) | 1.6 ± 0.2 / 4.4 | – | MSFR |
| AFGL5142 P5 (2) | 2.6 ± 0.6 / 6.4 | – | MSFR |
| AFGL5142 P6 (2) | 2.2 ± 0.6 / 4.6 | – | MSFR |
| W5 1 (3) | 1.9 | – | MSFR |
| W3(OH) (3) | 3 | – | MSFR |
| Orion plateau (4) | 2.7 | – | MSFR |
| L1157-B1 (5) | 2.6 | < 1.1 | LMSFR |
| (protostellar shock) | |||
| B1-a (6) | 1-3 | – | LMSFR |
Notes. Region types are as follows: Extragalactic giant molecular clouds (EGMC), Galactic Centre molecular clouds (GCMC), massive star-forming regions (MSFR), and low-mass star-forming regions (LMSFR).
Different spots with PN and PO emission identified towards the massive star-forming region AFGL 5142 by Rivilla et al. (2020). Two different values are presented: those derived from an LTE analysis (left), and those derived from a non-LTE analysis assuming Tkin = 20 K and gas density of 105 cm−3. (3)Rivilla et al. (2016), (4)Bernal et al. (2021), (5)Lefloch et al. (2016), (6)Bergner et al. (2019).
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