Table 1.
Sine-wave fit results for PKS 2131–021.
| Parameter | OVRO 15 GHz | ACT 95 GHz | ACT 147 GHz | ACT 225 GHz |
|---|---|---|---|---|
| P (days) | 1931 ± 19 (fixed) | |||
| A (Jy) | 0.4357 ± 0.0052 | 0.3185 ± 0.0089 | 0.2776 ± 0.0078 | 0.1899 ± 0.0240 |
| ϕ0 (rad) | 3.678 ± 0.015 | 3.212 ± 0.025 | 3.179 ± 0.027 | 3.100 ± 0.111 |
 (Jy) |
2.2148 ± 0.0040 | 1.4070 ± 0.0061 | 1.1550 ± 0.0054 | 0.9773 ± 0.0165 |
| ξ (Jy) | 0.0656 ± 0.0032 | 0.0897 ± 0.0043 | 0.0992 ± 0.0040 | 0.1374 ± 0.0141 |
| Δϕ0 (cycles) | 0 | −0.0742 ± 0.0046 | −0.0793 ± 0.0048 | −0.0919 ± 0.0179 |
| Δϕ0 (days) | 0 | −143.2 ± 9.0 | −153.1 ± 9.3 | −177.5 ± 34.6 |
Notes. The period, P, was determined from an initial fit including only the OVRO data in the range 57500 < MJD < 59800. The joint fit including OVRO and the three ACT light curves kept the period fixed at this best-fitting value. The fit uncertainties do not account for systematics due to superimposed, shorter term variations (see Appendix C). The reference time for the phase, in MJD, is t0 = 59 000. The phase shift, Δϕ0, is defined in Eq. (2). Here, and in Tables 2 and B.1, two significant figures are retained in the quoted uncertainties for consistency across all fits and as useful for error propagation, but we do not claim to know errors to that precision (see Appendix C.1).
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