Table 1.
Observational properties of six LMXBs that show PRE XRBs.
| Source | App. angular area | Touchdown flux | Spin freq. (a) | Distance (a) |
|---|---|---|---|---|
| (km/10 kpc)2 | (10−8 erg cm−2 s−1) | (Hz) | (kpc) | |
| 4U 1820–30 | 89.9 ± 15.9 | 5.98 ± 0.66 | … | 7.6 ± 0.4 (4) |
| 8.4 ± 0.6 (5–6) | ||||
| SAX J1748.9–2021 | 89.7 ± 9.6 | 4.03 ± 0.54 | 410 (1) | 8.2 ± 0.6 (4, 5, 7) |
| EXO 1745–248 | 117.8 ± 19.9 | 6.69 ± 0.74 | … | 6.3 ± 0.63 (b) (8–9) |
| KS 1731–260 | 96.0 ± 7.9 | 4.71 ± 0.52 | 524 (2) | 7–9 (c) (10) |
| 4U 1724–207 | 113.8 ± 15.4 | 5.29 ± 0.58 | … | 7.4 ± 0.5 |
| 4U 1608–52 | 314 ± 44.3 | 18.5 ± 2.0 | 620 (3) | 4.0 ± 2.0, Dcutoff > 3.9 (d) |
Notes. All values are obtained from Özel et al. (2016). The observational values, distance to target (D), apparent angular area (A), and touchdown flux (FTD, ∞) for the six targets are taken from Table 1 of Özel et al. (2016) except the distance to 4U 1608–52. Normal distributions for D, A, and FTD, ∞ are used for both our MC sampling and Bayesian analysis. Exceptions for the D distribution are given below.
References: (1) Altamirano et al. (2008), (2) Smith et al. (1997), (3) Hartman et al. (2003), (4) Kuulkers et al. (2003), (5) Valenti et al. (2007), (6) Güver et al. (2010b), (7) Güver & Özel (2013), (8) Ortolani et al. (2007), (9) Özel et al. (2009), (10) Özel et al. (2012).
The normal and flat distributions of the distance to EXO 1745–248 was used for our MC sampling and Bayesian analysis.
The flat distribution of the distance to KS 1731–260 was used for both our MC sampling and Bayesian analysis.
The distance measurement for 4U 1608–52 and the minimum distance of 3.9 kpc are from Güver et al. (2010a). We adopted a cut off below 3.9 kpc in our MC sampling, however, a Gaussian distribution was used in Steiner et al. (2010). For our Bayesian analysis, we use the posterior distribution in Özel et al. (2016), i.e., 3.63 ± 0.29.
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