Table 1.
Information about targeted objects and characteristics of ALMA observations for each frequency setup.
| Object ID | PJ231−20 |
PJ308−21 |
||||
|---|---|---|---|---|---|---|
| QSO | Companion ( ⋆ ) | QSO | Companion | |||
| RA (J2000.0) | 15h 26m 37.84s | 15h 26m 37.87s | 20h 32m 10.00s | 20h 32m 10.17s | ||
| Dec (J2000.0) | −20° 50′ 0.8″ | −20° 50′ 2.3″ | −21° 14′ 2.4″ | −21° 14′ 2.7″ | ||
| Redshift (1) | 6.58651 ± 0.00017 | 6.5900 ± 0.0008 | 6.2342 ± 0.0010 | 6.2485 ± 0.0005 | ||
| Frequency setup (2) | A | B | C | D | A | D |
| Band | 3 | 4 | 5 | 6 | 3 | 6 |
| Central frequency (GHz) (3) | 99.755 | 146.456 | 199.350 | 234.397 | 104.901 | 245.870 |
| Time on source (min) | 33.82 | 19.70 | 28.27 | 8.72 | 41.97 | 39.83 |
| Array configuration | C43-4 | C43-2, C43-3 | C43-2 | C43-2 | C43-4 | C43-2 |
| Number of antennas | 43 | 48 | 48 | 45 | 48 | 44 |
| Baselines (m) | 15 − 1547 | 15 − 500 | 15 − 360 | 15 − 483 | 15 − 783 | 15 − 455 |
| Beam (arcsec2) (4) |
 |
 |
 |
 |
 |
 |
| rms cont. (mJy beam−1) | 0.011 | 0.019 | 0.029 | 0.042 | 0.009 | 0.015 |
| ⟨rms⟩ cube (mJy beam−1) (5) | 0.24 | 0.27 | 0.47 | 0.48 | 0.19 | 0.20 |
| Observation date | 2019 Oct 6 | 2018 Apr 23 | 2018 Jun 4 | 2018 Aug 21 | 2019 Oct 14 | 2018 Aug 12 |
Notes. (1)Redshift of [CII]158 μm line from Decarli et al. (2017). (2)Setup A refers to ALMA Cycle 7 data, while setups C, B, and D refer to Cycle 5 data. (3)Central frequency of the entire frequency setup. (4)Beam sizes are those from the natural maps. (5)Averaged rms sensitivity over the entire bandwidth of the cubes (channel width of 40 km s−1). ( ⋆ )We note that Neeleman et al. (2019) found two companions in the PJ231−20 ALMA field located south and southwest of the QSO. However, our observations do not allow us to spatially resolve the two sources. We assume that the bulk of the emission from companion galaxies arises from the source south of the central PJ231−20 QSO, which is reported in Decarli et al. (2017) and denoted ‘C’ in Neeleman et al. (2019).
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