Table 3.
Properties of the diffuse radio sources in the cluster Abell 2744.
| Source | VLA (1−4 GHz) |
uGMRT (300−850 MHz) |
GMRT |
LLS (†) | α(† †) | P1.5 GHz | |||
|---|---|---|---|---|---|---|---|---|---|
| S3.0 GHz | S1.5 GHz | S675 MHz | S385 MHz | S235 MHz | S150 MHz | ||||
| (mJy) | (mJy) | (mJy) | (mJy) | (mJy) | (mJy) | (Mpc) | (1024 W Hz−1) | ||
| R1 | 5.2 ± 0.4 | 12.3 ± 1.0 | 30.1 ± 1.9 | 70 ± 6.8 | 98 ± 10 | 161 ± 22 | ∼1.5 | −1.17 ± 0.03 | 3.93 ± 0.03 |
| R2 | 0.70 ± 0.14 | 1.9 ± 0.2 | 4.0 ± 1.0 | 7.0 ± 3 | − | − | ∼1.1 | −1.19 ± 0.05 | 0.61 ± 0.08 |
| R3 | 0.55 ± 0.07 | 1.2 ± 0.1 | 2.6 ± 0.4 | − | − | − | ∼1.1 | −1.10 ± 0.05 | 0.38 ± 0.08 |
| R4 | 0.30 ± 0.07 | 0.7 ± 0.1 | 5.0 ± 0.8 | 3.1 ± 0.7 | − | − | ∼0.2 | −1.14 ± 0.04 | 0.22 ± 0.08 |
| Halo | 16.4 ± 1.0 | 42.9 ± 2.1 | 105 ± 9 | 185 ± 16 | 290 ± 35 | 526 ± 52 | ∼2.5 | −1.14 ± 0.05 | 13.6 ± 0.04 |
Notes. Flux densities of relics were extracted from 15″ resolution images at 235 MHz, 385 MHz, 675 MHz, 1.5 GHz and 3 GHz, corresponding to images IM3, IM7, IM13, IM17, and IM19, respectively. For imaging properties see Table 2. The flux density of the halo is measured from 20″ images, namely IM4, IM8, IM14, IM18, IM20, and IM22. All 150 MHz flux densities are measured from IM22. The regions where the flux densities were extracted are indicated in the left panel of Fig. 6. The flux density values are measured above 3σ noise level. Absolute flux density scale uncertainties are assumed to be 10% for the uGMRT or GMRT data and 2.5% for the VLA L- and S-band data. (†)The LLS measured at 675 MHz. († †)The integrated spectral index obtained by a single power-law fit.
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