Table 2.
Properties of the extragalactic FXRT candidates detected and/or discussed in this work, ordered by subsample and date.
| FXRT | Id | ObId | Exp. (ks) | Date | T90 (ks) | RA (deg) | Dec (deg) | Off. Ang. | Flux | Pos. Unc. | HR | S/N |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) |
| Nearby extragalactic FXRT Candidates from CSC2 | ||||||||||||
| 1 | XRT 000519 (†) | 803 | 31.0 | 2000-05-19 | 11.6 |
186.38125 | 13.06607 | 13 3 |
6.4e−13 | 1 8 |
−0.59±0.02 | 35.1 |
| 2 | XRT 010908 | 2025 | 61.5 | 2001-09-08 | 25.7 |
167.86792 | 55.67253 | 2 5 |
9.2e−15 | 1 06 |
−0.21 ± 0.13 | 6.2 |
| 3 | XRT 070530 | 8490 | 97.2 | 2007-05-30 | 29.8 |
201.24329 | −43.04060 | 4 1 |
2.6e−15 | 1 3 |
−0.68 ± 0.17 | 4.6 |
| 4 | XRT 071203 | 9546 | 31.8 | 2007-12-03 | 25.3 |
211.25113 | 53.65706 | 0 7 |
7.0e−15 | 1 13 |
−0.59 ± 0.14 | 5.2 |
| 5 | XRT 080331 | 9548 | 51.7 | 2008-03-31/4-1 | 32.8 |
170.07296 | 12.97189 | 0 9 |
2.0e−14 | 1 0 |
−0.73±0.05 | 12.0 |
| 6 | XRT 130822 | 14904 | 32.2 | 2013-08-22 | 12.1 |
345.49250 | 15.94871 | 1 6 |
6.3e−15 | 0 79 |
−0.46 ± 0.17 | 4.6 |
| Distant extragalactic FXRT Candidates from CSC2 | ||||||||||||
| 7 | XRT 030511 (†) | 4062 | 48.1 | 2003-05-10/11 | 6.5 |
76.77817 | −31.86980 | 10 7 |
1.1e−13 | 1 56 |
−0.38 ± 0.04 | 16.9 |
| 8 | XRT 041230 | 5885 | 73.4 | 2004-12-30/31 | 40.2 |
318.12646 | −63.49914 | 3 4 |
3.3e−15 | 0 93 |
−0.46 ± 0.20 | 4.3 |
| 9 | XRT 080819 | 9841 | 17.7 | 2008-08-19 | 8.3 |
175.00504 | −31.91743 | 5 1 |
1.7e−14 | 1 03 |
−0.62 ± 0.17 | 4.7 |
| 10 | XRT 100831 | 12264 | 43.0 | 2010-08-31 | 4.3 |
90.00450 | −52.71501 | 4 8 |
3.9e−15 | 1 16 |
−0.66 ± 0.14 | 5.0 |
| 11 | XRT 110103 (†) | 12884 | 87.0 | 2011-01-03 | 40.1 |
212.12063 | −27.05784 | 13 3 |
6.2e−14 | 2 59 |
−0.24±0.04 | 15.7 |
| 12 | XRT 110919 (†) | 13454 | 94.2 | 2011-09-19/20 | 17.2 |
15.93558 | −21.81272 | 7 2 |
1.6e−14 | 1 10 |
−0.19±0.11 | 7.2 |
| 13 | XRT 140327 | 15113 | 36.4 | 2014-03-27 | 13.4 |
45.26725 | −77.88095 | 6 6 |
3.9e−15 | 1 76 |
−0.63 ± 0.19 | 3.9 |
| 14 | XRT 141001/ | 16454 | 49.5 | 2014-10-01 | 5.1 |
53.16158 | −27.85940 | 4 3 |
3.7e−14 | 0 66 |
−0.16±0.09 | 9.2 |
| CDF-S XT1 (†) | ||||||||||||
Notes. Column 1: Shorthand identifier (FXRT #) used throughout this work. Column 2: X-ray transient identifier (XRT date), plus previous name when available. Columns 3–5: Chandra observation ID, exposure time in units of ks, and date. Column 6: T90 duration, which measures the time over which the event emits the central 90% (i.e., from 5% to 95%) of its total measured counts, in units of ks. Columns 7 and 8: Right ascension and declination in J2000 equatorial coordinates. Column 9: Instrumental off-axis angle of the FXRT candidates, with respect to the Chandra aimpoint, in units of arcminutes. Column 10: Aperture-corrected, observation-averaged 0.5–7.0 keV flux inferred from the CSC2, in cgs units. Column 11: Estimated 2σ X-ray positional uncertainty from the CSC2, in units of arcseconds; as demonstrated in Bauer et al. (2017), this can be improved by up to ≈40% when sufficient optical/X-ray cross-matches are available. Column 12: Hardness ratio (HR) and 1σ uncertainty, defined as HR=(H−S)/(H+S), where H = 2–7 keV and S = 0.5–2 keV energy bands, using the Bayesian estimation of Park et al. (2006). Column 13: Approximate signal-to-noise ratio (S/N).
Previously reported as FXRTs by Jonker et al. (2013) in the case of FXRT 1 (or XRT 000519), Glennie et al. (2015) for FXRT 11 (or XRT 110103), Lin et al. (2019) for FXRT 7 (or XRT 030511) and FXRT 12 (or XRT 110919), and Bauer et al. (2017) for FXRT 14 (or XRT 141001/CDF-S XT1).
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