Table 2
Modeling the radio emission.
| UGC 12914/5 | Ref. | UGC 813/6 | Ref. | |
|
|
||||
| Kinetic energy | ||||
| vcoll | 600 km s-1 | 1 | 600 km s-1 | 2, 5 |
| M(HI)(a) (bridge) | 2 × 109 M⊙ | 3 | 3.2 × 109 M⊙ | 4 |
| M(H2)(a, b) (bridge) | (2−9) × 109 M⊙ | 3 | (0.55−2.2) × 109 M⊙ | 4 |
| E kin,low(c) | 4.9 × 1057 erg | 5 | 3.2 × 1057 erg | 5 |
| E kin,high(c) | 1.4 × 1058 erg | 5 | 4.6 × 1057 erg | 5 |
|
|
||||
| Energy loss of the relativistic electrons | ||||
| distance between galaxy nuclei | 20 kpc | 1 | 21.6 kpc | 2 |
| time since start of interaction, T | 2.8 × 107 yr | 5 | 3.1 × 107 yr | 5 |
| B | 7 μG | 1 | 7 μG | 2 |
| Urad | 0.76 eV cm-3 | 5 | 0.56 eV cm-3 | 5 |
|
|
||||
| Predicted radio emission | ||||
| Pν-predicted, low(c, d) | (0.6−1.8) × 1022 W Hz-1 | 5 | (0.6−1.8) × 1022 W Hz-1 | 5 |
| Pν-predicted, high(c, d) | (1.7−5.1) × 1022 W Hz-1 | 5 | (0.9−2.6) × 1022 W Hz-1 | 5 |
| α-predicted | 1.4 | 5 | 1.3 | 5 |
Notes. See Sects. 3.1 and 3.4 for a detailed explanation of how the quantities were derived.
The greater mass is calculated for a Galactic conversion factor from CO intensity to H2 mass, the lower value for a conversion factor four times lower.
The value named “low” is calculated with a value four times lower for the molecular gas mass and the value named “high” is calculated with a Galactic conversion factor.
The range of values is given by the uncertainties of the efficiency of CR acceleration in shocks (between 10 and 30%).
References. (1) Condon et al. (1993); (2) Condon et al. (2002); (3) Braine et al. (2003); (4) Braine et al. (2004); (5) present work.
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