Table 2
Overview of the outburst properties and estimated (time-averaged) mass-accretion rates.
| Source | Year | tob | F˜ | Duty cycle | ⟨Ṁ⟩ob | ⟨Ṁ⟩long |
|
|
||||||
| AX J1745.6–2901 | 10−30% | ~(3−8) × 10-11 | ||||
| 2007–2008 | >80 | >7 × 10-3 | ~3 × 10-10 | |||
| 2006 | >16 | ≳5 × 10-4 | ~1 × 10-10 | |||
| CXOGC J174535.5–290124 | 20−50% | ~(7−14) × 10-13 | ||||
| 2008 | >8 | ≳7 × 10-6 | ~3 × 10-12 | |||
| 2006 | >12 | ≳2 × 10-5 | ~4 × 10-12 | |||
| GRS 1741–2853 | 5−15% | ~(2−6) × 10-11 | ||||
| 2009 | 4−5 | ~8 × 10-4 | ~5 × 10-10 | |||
| 2007 | >13 | ≳1 × 10-3 | ~3 × 10-10 | |||
| 2006 | <1 | ≲3 × 10-6 | ~8 × 10-12 | |||
| XMM J174457–2850.3 | 5−50% | ~(1−10) × 10-12 | ||||
| 2009 | <2 | ≲3 × 10-5 | ~4 × 10-11 | |||
| 2008 | 1−7 | ~(2−10) × 10-5 | ~6 × 10-11 | |||
| 2008-low | >16 | ≳3 × 10-5 | ~2 × 10-12 | |||
| 2007 | <12 | ≲4 × 10-6 | ~1 × 10-12 | |||
| CXOGC J174538.0–290022 | 2009 | 30−52 | ~(9−20) × 10-5 | 5−20% | ~1 × 10-11 | ~(5−20) × 10-13 |
| CXOGC J174540.0–290005 | 2006 | 2 | ~1 × 10-5 | 1−5% | ~2 × 10-11 | ~(3−13) × 10-13 |
| Swift J174553.7–290347 | 2006 | 2 | ~8 × 10-6 | ≲5% | ~2 × 10-11 | ≲6 × 10-13 |
| Swift J174622.1–290634 | 2006 | 5 | ~5 × 10-6 | ≲14% | ~3 × 10-12 | ≲4 × 10-13 |
Notes. The outburst duration, tob, is expressed in weeks. F˜ represents the fluence of the outburst in units of erg cm-2 in the 2–10 keV energy band. ⟨Ṁ⟩ob is the estimated average accretion rate during outburst (M⊙ yr-1) assuming a neutron star primary with M = 1.4 M⊙ and R = 10 km. The estimated time-averaged mass-accretion rate is given by ⟨Ṁ⟩long. Note that only AX J1745.6–2901 and GRS 1741–2853 are confirmed neutron star X-ray binaries, the other six sources have an unknown nature.
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