Table 1
Results from the IDV observations of quasar S4 0917+624 with the Urumqi 25 m telescope at 4.8 GHz.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Start day | dur | N | ⟨ S ⟩ | σ s | m | m 0 | Y | τ 0.5 |
|
P null | m / m 0 |
| [d] | [Jy] | [Jy] | [%] | [%] | [%] | [d] | |||||
|
|
|||||||||||
| 2005 Aug 15 | 2.8 | 52 | 0.899 | 0.013 | 1.48 | 0.34 | 4.32 | 0.26 | 9.30 | 5.30E-70 | 4.4 |
| 2006 Apr. 28 | 3.9 | 71 | 1.069 | 0.014 | 1.33 | 0.45 | 3.76 | 0.24 | 2.18 | 4.45E-08 | 3.0 |
| 2006 Jun. 10 | 3.2 | 88 | 1.090 | 0.014 | 1.29 | 0.50 | 3.58 | 0.24 | 1.80 | 7.32E-06 | 2.6 |
| 2006 Jul. 14 | 4.0 | 94 | 1.083 | 0.014 | 1.29 | 0.60 | 3.42 | − | 1.51 | 1.11E-03 | 2.2 |
| 2006 Aug. 19 | 2.2 | 66 | 1.082 | 0.009 | 0.81 | 0.45 | 2.02 | − | 1.06 | 3.58E-01 | 1.8 |
| 2006 Sep. 23 | 4.9 | 141 | 1.093 | 0.010 | 0.96 | 0.45 | 2.54 | − | 1.30 | 9.46E-03 | 2.1 |
| 2006 Nov. 17 | 4.7 | 133 | 1.092 | 0.012 | 1.08 | 0.47 | 2.91 | − | 1.11 | 1.90E-01 | 2.3 |
| 2007 Jan. 25 | 2.3 | 66 | 1.132 | 0.009 | 0.82 | 0.41 | 2.14 | − | 0.94 | 6.09E-01 | 2.0 |
| 2007 Feb. 12 | 4.0 | 109 | 1.145 | 0.014 | 1.18 | 0.41 | 3.32 | 0.24 | 1.60 | 8.47E-05 | 2.9 |
| 2007 Mar. 24 | 2.8 | 71 | 1.163 | 0.009 | 0.76 | 0.46 | 1.82 | − | 0.68 | 9.81E-01 | 1.7 |
| 2007 Apr. 20 | 3.6 | 78 | 1.211 | 0.017 | 1.36 | 0.62 | 3.65 | 0.18 | 1.62 | 4.80E-04 | 2.2 |
| 2007 Jun. 15 | 2.4 | 62 | 1.228 | 0.015 | 1.26 | 0.55 | 3.39 | − | 1.64 | 1.23E-03 | 2.3 |
| 2007 Jul. 19 | 2.9 | 72 | 1.267 | 0.017 | 1.36 | 0.55 | 3.72 | 0.16 | 1.92 | 5.31E-06 | 2.5 |
| 2007 Oct. 13 | 3.0 | 59 | 1.261 | 0.007 | 0.59 | 0.34 | 1.42 | − | 0.48 | 1.00E+00 | 1.7 |
| 2007 Dec. 21 | 3.2 | 76 | 1.285 | 0.009 | 0.71 | 0.32 | 1.91 | − | 0.67 | 9.89E-01 | 2.2 |
| 2008 Feb. 25 | 2.9 | 59 | 1.313 | 0.016 | 1.19 | 0.59 | 3.09 | − | 1.50 | 7.88E-03 | 2.0 |
| 2008 Mar. 22 | 3.0 | 80 | 1.324 | 0.014 | 1.03 | 0.36 | 2.90 | − | 1.40 | 1.10E-02 | 2.9 |
| 2008 Apr. 22 | 3.1 | 74 | 1.347 | 0.012 | 0.87 | 0.47 | 2.19 | − | 0.87 | 7.85E-01 | 1.9 |
| 2008 Jun. 21 | 3.5 | 59 | 1.405 | 0.011 | 0.76 | 0.46 | 1.84 | − | 0.86 | 7.75E-01 | 1.7 |
| 2008 Jul. 20 | 2.5 | 57 | 1.419 | 0.014 | 1.02 | 0.57 | 2.51 | − | 0.77 | 8.91E-01 | 1.8 |
| 2008 Aug. 20 | 5.0 | 70 | 1.442 | 0.015 | 1.06 | 0.60 | 2.63 | − | 1.30 | 4.98E-02 | 1.8 |
| 2008 Sep. 13 | 3.4 | 88 | 1.467 | 0.012 | 0.83 | 0.35 | 2.27 | − | 0.82 | 8.90E-01 | 2.4 |
| 2008 Nov. 06 | 3.6 | 59 | 1.450 | 0.017 | 1.18 | 0.60 | 3.06 | − | 0.94 | 6.11E-01 | 2.0 |
| 2008 Dec. 22 | 2.3 | 61 | 1.484 | 0.011 | 0.71 | 0.31 | 1.92 | − | 0.47 | 1.00E+00 | 2.3 |
| 2009 May 13 | 2.7 | 51 | 1.530 | 0.021 | 1.39 | 0.58 | 3.80 | − | 1.63 | 3.40E-03 | 2.4 |
| 2009 Jun. 25 | 2.6 | 53 | 1.510 | 0.020 | 1.32 | 0.57 | 3.55 | − | 1.71 | 1.15E-03 | 2.3 |
| 2009 Sep. 22 | 5.5 | 135 | 1.533 | 0.014 | 0.95 | 0.55 | 2.30 | − | 0.79 | 9.65E-01 | 1.7 |
| 2009 Oct. 09 | 2.3 | 61 | 1.528 | 0.012 | 0.78 | 0.38 | 2.06 | − | 0.58 | 9.96E-01 | 2.1 |
| 2009 Nov. 22 | 3.8 | 78 | 1.523 | 0.019 | 1.24 | 0.72 | 3.05 | − | 0.99 | 7.43E-01 | 1.7 |
| 2010 Jan. 19 | 3.5 | 70 | 1.521 | 0.015 | 1.00 | 0.57 | 2.45 | − | 0.80 | 8.90E-01 | 1.8 |
Notes. Columns are: (1) observing epoch; (2) the duration of observation; (3) the number of effective data points; (4) the mean flux density; (5) the root-mean square (rms) flux density; (6) the modulation index m of S4 0917+624; (7) the mean modulation index of calibrators; (8) the relative variability amplitude Y; (9) the IDV timescale with Rickett et al. definition; (10) the reduced chi-square; (11) the null (non-variability) probability; (12) the ratio of the modulation index to the mean modulation index of calibrators.
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