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Table 1.
Overview of off-states or low-flux observations of Vela X-1 reported in the literature.
| References | Date | Instrument | Energy range | Off-state luminosity |
|---|---|---|---|---|
| Kallman & White (1982), Hayakawa (1984) | 9 May 1979 | Einstein | 2–10 keV | Not quantified |
| Inoue et al. (1984), Hayakawa (1984) | 12 Mar. 1983 | Tenma | 3–9 keV | < 10% of preceding |
| Lapshov et al. (1992) | 9 Jan. 1991 | Granat/WATCH | 8-15 keV | Not quantified |
| Kreykenbohm et al. (1999) | 23 Feb. 1996 | RXTE/PCA | 3–30 keV | < 15% of normal |
| Kretschmar et al. (2000) | 22 Jan. 1998 | RXTE/PCA | 2–60 keV | Not quantified |
| Kreykenbohm et al. (2008) | 8 Dec. 2003 | INTEGRAL/ISGRI | 20-40 keV | Not quantified |
| Doroshenko et al. (2011) | 17–18 Jun. 2008 | Suzaku/XIS | 0.4–70 keV | ∼2.4 × 1035 erg s−1 |
| Sidoli et al. (2015) | 2002–2012 | INTEGRAL/ISGRI | 22–50 keV | ≲3 × 1035 erg s−1 |
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