Table 3
WISE IR sources detected towards the submm sources in G304.74.
| Source | WISE ID | W1(3.4 μm) | W2(4.6 μm) | W3(12 μm) | W4(22 μm) | Offset | Typea |
| [mag] | [mag] | [mag] | [mag] | [″] | |||
|
|
|||||||
| SMM 1ab | ... | ... | ... | ... | ... | ... | ... |
| SMM 1b | J130622.27-613014.7 | 10.511 ± 0.024 | 8.712 ± 0.02 | 6.845 ± 0.045 | 4.197 ± 0.045 | 8.9 | shock |
| SMM 2 | J130628.64-612942.7 | 9.966 ± 0.023 | 8.489 ± 0.020 | 5.732 ± 0.028 | 3.310 ± 0.029 | 1.4 | YSO |
| SMM 3 | J130637.23-612848.8 | > 15.531 | 11.005 ± 0.033 | 7.667 ± 0.087 | 3.584 ± 0.035 | 2.7 | YSO |
| SMM 4a | J130646.35-612855.3 | 14.719 ± 0.217 | 12.666 ± 0.026 | > 9.344 | 6.001 ± 0.233 | 7.4 | YSO |
| SMM 4b | J130647.85-612819.5 | 11.546 ± 0.032 | 9.862 ± 0.026 | 5.347 ± 0.026 | 1.869 ± 0.029 | 7.9 | YSO |
| SMM 4cb | ... | ... | ... | ... | ... | ... | ... |
| SMM 5b,c | ... | ... | ... | ... | ... | ... | ... |
| IRAS 13037-6112a | J130651.93-612822.2 | 8.613 ± 0.025 | 6.847 ± 0.021 | 4.030 ± 0.015 | 0.895 ± 0.017 | 3.9 | YSO |
| IRAS 13037-6112b | J130651.58-612751.7 | 13.551 ± 0.108 | 9.600 ± 0.023 | 6.168 ± 0.029 | 1.847 ± 0.012 | 2.6 | YSO |
| SMM 6a | J130654.93-612725.9 | 13.435 ± 0.086 | 10.075 ± 0.023 | 6.347 ± 0.024 | 3.570 ± 0.026 | 3.7 | YSO |
| SMM 6b | J130652.20-612735.0 | 11.896 ± 0.030 | 9.589 ± 0.021 | 7.596 ± 0.049 | 3.385 ± 0.021 | 5.6 | YSO/shock |
| SMM 7 | J130704.50-612620.6 | > 16.444 | > 16.831 | > 10.699 | 5.765 ± 0.041 | 6.0 | SFG/AGN |
| IRAS 13039-6108a | J130707.22-612438.5 | 10.261 ± 0.032 | 8.256 ± 0.020 | 3.799 ± 0.014 | 0.875 ± 0.017 | 7.7 | YSO |
| IRAS 13039-6108bb | ... | ... | ... | ... | ... | ... | ... |
| SMM 8c | J130708.93-612346.9 | 13.415 ± 0.084 | 11.215 ± 0.023 | > 9.752 | 6.015 ± 0.062 | 7.3 | shock |
| SMM 9b | ... | ... | ... | ... | ... | ... | ... |
| IRAS 13042-6105 | J130721.38-612149.9 | 12.440 ± 0.041 | 8.855 ± 0.020 | 6.265 ± 0.027 | 3.025 ± 0.019 | 5.7 | YSO |
|
|
|||||||
| BLOB 1c | J130641.48-612916.3 | 14.727 ± 0.126 | 12.233 ± 0.032 | > 9.792 | > 8.719 | 8.6 | YSO |
| BLOB 2b | ... | ... | ... | ... | ... | ... | ... |
Notes. The magnitudes are given in the Vega system, and they were taken from the AllWISE catalogue. The catalogue magnitudes were measured with profile-fitting photometry, and they represent the total in-band brightnesses. The magnitude upper limits refer to the 95% confidence brightness limit.
Classification of the WISE source on the basis of the Koenig et al. (2012) colour criteria. All the other sources are expected to be embedded YSOs, except that SMM 1b and SMM 8 are associated with shock emission knots, SMM 6b has the colours in between an embedded YSO and a shock feature, and the WISE source seen towards SMM 7 is likely to be an extragalactic object, that is a star-forming galaxy or an active galactic nucleus.
No WISE counterpart was found within 9″. We note that there is a WISE source 
away from SMM 9 (J130713.09-612238.2; W1 = 12.765 ± 0.051, W2 = 11.929 ± 0.029, W3 > 10.159, W4 = 7.549 ± 0.117). Its WISE colours are not consistent with an embedded YSO, but it could be a foreground star (Koenig et al. 2012).
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