Table 2
Properties of detected supernova remnants.
| Supernova remnant | Angulara | S 1 GHz a | Spectrala | Notesb | |
| diameter (′) | (Jy) | index | |||
|
|
|||||
| G21.5-0.9 | G21.5-0.9...... | 4 | 7 | 0.00 | <103 yr, pulsar |
| G34.7-0.4 | W 44......... | 35 | 230 | 0.37 | 2 × 104 yr, dense |
| G69.0+2.7 | CTB 80......... | 80 | 120 | ... | 105 yr, pulsar, plerion |
| G74.0-8.5 | Cygnus Loop..... | 230 | 210 | ... | mature |
| G89.0+4.7 | HB 21......... | 120 | 220 | 0.38 | 5000 yr, dense |
| G111.7-2.1 | Cas A......... | 5 | 2720 | 0.77 | 330 yr, ejecta, CCO |
| G120.1+1.4 | Tycho......... | 8 | 56 | 0.65 | young, Type Ia |
| G130.7+3.1 | 3C 58......... | 9 | 33 | 0.07 | 830 yr, plerion, pulsar |
| G184.6-5.8 | Crab......... | 7 | 1040 | 0.30 | 958 yr, plerion, pulsar |
| G189.1+3.0 | IC 443......... | 40 | 160 | 0.36 | 3 × 104 yr, dense ISM, CCO |
| G260.4-3.4 | Puppis A...... | 60 | 130 | 0.50 | CCO, 3700 yr |
| G263.9-3.3 | Vela......... | 255 | 1750 | ... | 104 yr |
| G296.5+10.0 | PKS 1209-51/52.... | 90 | 48 | 0.5 | ~104 yr |
| G315.4-2.3 | RCW 86......... | 42 | 49 | 0.60 | 1800 yr |
| G326.3-1.8 | MSH 15-56..... | 38 | 145 | ... | |
| G327.6+14.6 | SN 1006...... | 30 | 19 | 0.60 | 1008 yr, Type Ia |
Notes.
Flux densities at 1 GHz, radio spectral indices, and angular diameters are from Green (2009). For cases of unknown or strongly-spatially-variable spectral index, we put “...” in the table and use a nominal value of 0.5 in the figures for illustration purposes only.
Notes on the properties of the SNR, gleaned from the Green (2009) catalogue and references therein, as well as updates from the online version http://www.mrao.cam.ac.uk/projects/surveys/snrs/. Plerion: radio emission is centre-filled. Pulsar: a pulsar is associated with the SNR. CCO: a central compact object (presumably a neutron star) is associated with the supernova remnant from high-energy images. Dense ISM: the supernova remnant is interacting with a dense interstellar medium. Xyr: estimated age of the supernova remnant. Mature: age likely greater than 105 yr. Type X: the supernova that produced this supernova remnant was of type X.
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