Open Access
Table 1
Summary of the data simulation parameters using CASA.
| Parameter | Value | Notes |
|---|---|---|
| Antenna configuration | ALMA Cycle 5.3 | |
| Number of antennas | 50 | |
| Field | COSMOS | J2000 10h00m28.6s + 02d12m21.0s |
| Number of pointings or simulations | 9164 | Every pointing is randomly chosen within a radius of 1 deg around the field. |
| Central frequency | Band 6 (230 GHz) | |
| Number of channels | 240 | |
| Channel width | 7.8 MHz | |
| Sampling time | 10s | |
| Total integration time | 20 min | |
| Hour angle | Transit | |
| Sky model dimensions | 512 × 512 pixel with 240 channels | |
| Pixel size | 0.1″ | |
| Source type | Gaussian | The size of the major/minor axis and position angle is varied randomly and is chosen to be below the synthesized beam. |
| Major (minor) axis | 0.4″ to 0.8″ | Typical resolution is 0.89″ × 0.82″. |
| Position angle (PA) | 0–360 deg | Chosen randomly. |
| Number of sources | 0–5 | Randomly chosen between 1 and 5. We add a few source free simulations. |
| Source positions | Random | Sources are randomly distributed within the primary beam. |
| Flux range | 0.05–0.5 mJy | The flux of each source is randomly chosen from this range assuming a uniform distribution. This roughly keeps a flat S/N range for our data set. |
| Spectral index | 0 | We set this parameter to zero since the fractional bandwidth is quite small (0.8%). |
| Primary beam | 22.86″ | |
| Synthesized beam | 0.89″ × 0.82″ | |
| Noise (PWV) | 1.796 | This parameter adds the receiver and atmospheric noise due to water vapor to the visibilities. |
| Weighting | Natural | |
| Robust | 0.5 | |
| RMS noise (in images) | ~50 µJy | |
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