Here is a list of lines and bands which have been detected in ISO
spectra, but whose identification is still uncertain or unknown. Some info
is also provided regarding the type of objects where the line/band has
already been seen; when available, a reference is also given.
| Wavelength | Type | Objects | Reference |
| 2.894 | line | NGC7027, Galactic Center, Orion | Feuchtgruber/Sturm (priv. comm.) |
| 3.25 | band | M82, NGC253, Circinus | Sturm et al. 2000, A&A in press
(astro-ph/0002195) |
| 3.3 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 3.4 | band | M82, NGC253, 30 Dor | " |
| 3.5 | band | M82, 30 Dor | " |
| 3.75 | band | NGC253, Circinus | " |
| 5.25 | band | M82 | " |
| 5.65 | band | M82, Circinus | " |
| 6.0 | band | M82, NGC253, 30 Dor | " |
| 6.2 | band | M82, NGC253, 30 Dor, Circinus | " |
| 6.3 | band | M82, NGC253, 30 Dor, Circinus | " |
| 7.0 | band | M82, NGC253 | " |
| 7.555 | line | NGC1068 | Lutz et al. 2000, ApJ in press
(astro-ph/0002008) |
| 7.6 | band | M82, NGC253, 30 Dor, Circinus | Sturm et al. 2000, A&A in press
(astro-ph/0002195) |
| 7.8 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 8.3 | band | M82, NGC7023 | " |
| 8.6 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 10.6 | band | M82 | " |
| 11.05 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 11.25 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 12.0 | band | M82, NGC253, 30 Dor | " |
| 12.7 | band | M82, NGC253, Circinus | " |
| 13.55 | band | M82, NGC253, Circinus, NGC1068 | " |
| 14.25 | band | M82, NGC253, 30 Dor, Circinus | " |
| 14.8 | band | M82, NGC253 and more of them | " |
| 15.7 | band | M82, NGC253, 30 Dor, Circinus, NGC1068 | " |
| 16.5 | band | M82, NGC253, 30 Dor | " |
| 17.4 | band | M82, NGC253 | " |
| 18.0 | band | M82, 30 Dor | " |
| 34.0 | band | M82, NGC253, 30 Dor, Circinus | " |
| 74.24 | line | NGC7027
RWC 103 NGC1068 |
Liu et al. 1996, A&A 315, L257
Oliva et al. 1999, A&A 343, 943 N/A |
| 60.12 | line | Arp 220 | Fischer et al. in preparation |
| 77.155 | line | N/A | |
| 153.12 | line | Arp 220 | Fischer et al. in preparation |
| 173.631 | line | SgrB2 | Baluteau (priv. comm.) |