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Table 1.
Information of each Chandra observation and details of the individual-image spectra.
| ObsID | Date | Exposure | Acts | Bcts | Ccts | Dcts | ACR | BCR | CCR | DCR |
|---|---|---|---|---|---|---|---|---|---|---|
| 431 | 2000-09-06 | 30.29 | ⋆1272 ± 36 | 233 ± 15 | ⋆523 ± 23 | 177 ± 13 | 41.99 ± 1.18 | 7.69 ± 0.50 | 17.26 ± 0.26 | 5.84 ± 0.44 |
| 1632 | 2001-12-12 | 9.54 | 309 ± 18 | 51 ± 7 | 99 ± 10 | 52 ± 7 | 32.39 ± 1.84 | 5.34 ± 0.75 | 10.38 ± 1.04 | 5.45 ± 0.76 |
| 6831 | 2006-01-09 | 7.27 | 97 ± 10 | 86 ± 9 | 26 ± 5 | 35 ± 6 | 13.35 ± 1.36 | 11.83 ± 1.28 | 3.57 ± 0.70 | 4.82 ± 0.81 |
| 6832 | 2006-05-01 | 7.94 | 211 ± 15 | 111 ± 11 | 90 ± 10 | 58 ± 8 | 26.58 ± 1.83 | 13.98 ± 1.33 | 11.34 ± 1.19 | 7.31 ± 0.96 |
| 6833 | 2006-05-27 | 7.95 | 118 ± 11 | 56 ± 7 | 54 ± 7 | 21 ± 5 | 14.83 ± 1.37 | 7.04 ± 0.94 | 6.79 ± 0.92 | 2.64 ± 0.58 |
| 6834 | 2006-06-25 | 7.94 | 272 ± 16 | 111 ± 11 | 74 ± 9 | 54 ± 7 | 34.26 ± 2.07 | 13.98 ± 1.33 | 9.32 ± 1.08 | 6.80 ± 0.93 |
| 6835 | 2006-07-21 | 7.87 | 319 ± 18 | 79 ± 9 | 64 ± 8 | 49 ± 7 | 40.52 ± 2.27 | 10.03 ± 1.13 | 8.13 ± 1.02 | 6.22 ± 0.89 |
| 6836 | 2006-08-17 | 7.93 | 170 ± 13 | 62 ± 8 | 60 ± 8 | 40 ± 6 | 21.43 ± 1.64 | 7.82 ± 0.99 | 7.56 ± 0.98 | 5.04 ± 0.80 |
| 6837 | 2006-09-16 | 7.95 | 166 ± 13 | 62 ± 8 | 39 ± 6 | 35 ± 6 | 20.89 ± 1.62 | 7.80 ± 0.99 | 4.91 ± 0.79 | 4.40 ± 0.74 |
| 6838 | 2006-10-09 | 7.99 | 157 ± 13 | 53 ± 7 | 51 ± 7 | 34 ± 6 | 19.65 ± 1.57 | 6.63 ± 0.91 | 6.38 ± 0.89 | 4.26 ± 0.73 |
| 6839 | 2006-11-29 | 7.87 | ⋆538 ± 23 | 189 ± 14 | 108 ± 10 | 113 ± 11 | 68.32 ± 2.95 | 24.00 ± 1.75 | 13.71 ± 1.32 | 14.35 ± 1.35 |
| 6840 | 2007-01-14 | 7.98 | 441 ± 21 | 132 ± 11 | 118 ± 11 | 84 ± 9 | 55.29 ± 2.63 | 16.55 ± 1.44 | 14.79 ± 1.36 | 10.53 ± 1.15 |
| 11534 | 2009-12-31 | 28.46 | ⋆1756 ± 42 | 454 ± 21 | 164 ± 13 | ⋆802 ± 28 | 61.70 ± 1.47 | 15.95 ± 0.75 | 5.76 ± 0.45 | 28.18 ± 1.00 |
| 11535 | 2010-04-25 | 29.43 | 377 ± 19 | 101 ± 10 | 52 ± 7 | 150 ± 12 | 12.81 ± 0.66 | 3.43 ± 0.34 | 1.76 ± 0.25 | 5.10 ± 0.42 |
| 11536 | 2010-06-27 | 27.89 | 342 ± 19 | 105 ± 10 | 44 ± 7 | 163 ± 13 | 12.26 ± 0.66 | 3.76 ± 0.37 | 1.57 ± 0.24 | 5.84 ± 0.46 |
| 11537 | 2010-08-07 | 29.36 | 228 ± 15 | 68 ± 8 | 44 ± 7 | 116 ± 11 | 7.76 ± 0.51 | 2.31 ± 0.28 | 1.50 ± 0.23 | 3.95 ± 0.37 |
| 11538 | 2010-10-02 | 29.36 | ⋆501 ± 22 | 154 ± 12 | 49 ± 7 | 423 ± 21 | 17.06 ± 0.76 | 5.22 ± 0.42 | 1.67 ± 0.24 | 14.41 ± 0.70 |
| 11539 | 2010-11-23 | 9.83 | 93 ± 10 | 31 ± 6 | 13 ± 4 | 40 ± 6 | 9.46 ± 0.98 | 3.15 ± 0.57 | 1.32 ± 0.37 | 4.09 ± 0.64 |
| 13195 | 2010-11-26 | 9.83 | 91 ± 10 | 23 ± 5 | 10 ± 3 | 27 ± 5 | 9.25 ± 0.97 | 2.34 ± 0.49 | 1.01 ± 0.32 | 2.74 ± 0.53 |
| 13191 | 2010-11-27 | 9.83 | 82 ± 9 | 19 ± 4 | 9 ± 3 | 29 ± 5 | 8.34 ± 0.92 | 1.93 ± 0.44 | 0.91 ± 0.31 | 2.95 ± 0.55 |
| 12831 | 2011-05-14 | 29.36 | ⋆2677 ± 52 | ⋆575 ± 24 | 215 ± 15 | 429 ± 21 | 91.19 ± 1.76 | 19.58 ± 0.82 | 7.32 ± 0.50 | 14.61 ± 0.71 |
| 12382 | 2011-12-27 | 29.79 | 343 ± 19 | 128 ± 11 | 59 ± 8 | 100 ± 10 | 11.51 ± 0.62 | 4.29 ± 0.38 | 1.98 ± 0.26 | 3.36 ± 0.34 |
| 13960 | 2012-01-09 | 29.36 | 308 ± 18 | 122 ± 11 | 52 ± 7 | 117 ± 11 | 10.49 ± 0.60 | 4.15 ± 0.38 | 1.77 ± 0.25 | 3.98 ± 0.37 |
| 13961 | 2012-08-02 | 29.24 | ⋆906 ± 30 | 244 ± 16 | 213 ± 15 | 202 ± 14 | 30.98 ± 0.10 | 8.34 ± 0.53 | 7.28 ± 0.50 | 6.91 ± 0.49 |
| 14513 | 2012-12-26 | 28.62 | ⋆684 ± 26 | 247 ± 16 | 339 ± 18 | 260 ± 16 | 23.89 ± 0.91 | 8.26 ± 0.55 | 11.84 ± 0.64 | 9.08 ± 0.56 |
| 14514 | 2013-01-05 | 29.36 | ⋆622 ± 26 | 215 ± 15 | 298 ± 17 | 268 ± 16 | 21.18 ± 0.85 | 7.32 ± 0.50 | 10.15 ± 0.59 | 9.13 ± 0.56 |
| 14515 | 2013-08-31 | 9.73 | 164 ± 22 | 57 ± 8 | 62 ± 8 | 30 ± 5 | 16.85 ± 1.32 | 5.86 ± 0.78 | 6.37 ± 0.81 | 3.08 ± 0.56 |
| 16316 | 2013-08-26 | 9.83 | 120 ± 11 | 44 ± 7 | 47 ± 7 | 30 ± 5 | 12.21 ± 1.11 | 4.48 ± 0.68 | 4.78 ± 0.70 | 3.05 ± 0.56 |
| 16317 | 2013-08-28 | 9.83 | 105 ± 10 | 43 ± 7 | 45 ± 7 | 24 ± 5 | 10.68 ± 1.04 | 4.37 ± 0.67 | 4.58 ± 0.68 | 2.44 ± 0.50 |
| 14516 | 2013-10-01 | 29.35 | 230 ± 15 | 122 ± 11 | 70 ± 8 | 96 ± 10 | 7.83 ± 0.52 | 4.15 ± 0.38 | 2.38 ± 0.29 | 3.27 ± 0.33 |
| 14517 | 2014-05-14 | 29.36 | ⋆1071 ± 33 | 384 ± 20 | 322 ± 18 | 156 ± 12 | 36.48 ± 1.11 | 13.08 ± 0.67 | 10.97 ± 0.61 | 5.31 ± 0.43 |
| 14518 | 2014-06-08 | 29.28 | ⋆628 ± 25 | 263 ± 16 | 206 ± 14 | 117 ± 11 | 21.45 ± 0.86 | 8.98 ± 0.55 | 7.03 ± 0.49 | 3.99 ± 0.37 |
| 18804 | 2016-04-24 | 28.60 | ⋆1009 ± 32 | 269 ± 16 | 132 ± 11 | 126 ± 11 | 35.28 ± 1.11 | 9.40 ± 0.57 | 4.61 ± 0.40 | 4.41 ± 0.39 |
| 19638 | 2016-12-22 | 33.34 | 302 ± 17 | 120 ± 11 | 51 ± 7 | 77 ± 9 | 9.05 ± 0.52 | 3.60 ± 0.33 | 1.53 ± 0.21 | 2.31 ± 0.26 |
| 19639 | 2017-01-04 | 32.92 | 249 ± 16 | 113 ± 11 | 46 ± 7 | 68 ± 8 | 7.56 ± 0.48 | 3.43 ± 0.32 | 1.40 ± 0.21 | 2.06 ± 0.25 |
| 19640 | 2017-12-20 | 34.23 | 402 ± 20 | 210 ± 14 | 76 ± 9 | 94 ± 10 | 11.74 ± 0.59 | 6.13 ± 0.42 | 2.22 ± 0.26 | 2.74 ± 0.28 |
| 19641 | 2018-01-14 | 34.23 | 368 ± 19 | 170 ± 13 | 92 ± 10 | 77 ± 9 | 10.75 ± 0.56 | 4.96 ± 0.38 | 2.10 ± 0.25 | 2.25 ± 0.26 |
Notes. The spectra with more than 500 counts are marked with a star (high-statistics sample – HSS). The observations are listed from earliest to latest date. The exposure time is given in units of kiloseconds. The image net (i.e., background-subtracted) counts and CRs are referred to the 0.4–7 keV observed-energy range. The count rates are given in units of 10−3 cts s−1.
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