GX339–4: a new black hole candidate

Samimi, J.; Share, G. H.; Wood, K. S.; Yentis, D.; Meekins, J. F.; Evans, W. D.; Shulman, S.; Byram, E. T.; Chubb, T. A.; Friedman, H.

doi:10.1038/278434a0

Cited by 63 publications

(32 citation statements)

References 10 publications

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“…On arcmin scale, X‐ray jets have been recently detected (Heinz et al 2007; Soleri et al 2009): Cir X‐1 is the only secure neutron star system in which such ejections have been spatially resolved. The source is also characterized by a hard X‐ray emission (Iaria et al 2001; Ding, Qu & Li 2003) and very strong X‐ray variability (Jones et al 1974; Samimi et al 1979; Oosterbroek et al 1995), showing dramatic evolution of its X‐ray luminosity, spectra and timing properties on time‐scales from milliseconds to decades (Shirey, Bradt & Levine 1999; Parkinson et al 2003). Oosterbroek et al (1995) identified atoll‐source behaviour (strong band‐limited noise and non‐Z‐like pattern in the CDs and HIDs) in the low‐flux phases of Cir X‐1 while Shirey et al (1998), in an analysis of Rossi X‐ray Timing Explorer ( RXTE ) data, identified the first typical Z‐source features in the power density spectra and then (Shirey et al 1999) a complete Z track in its high‐luminosity orbital phases.…”

Section: Introductionmentioning

confidence: 99%

Linking jet emission and X-ray properties in the peculiar neutron star X-ray binary Circinus X-1

Soleri

Tudose

Fender

et al. 2009

Monthly Notices of the Royal Astronomical Society

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We present the results of simultaneous X‐ray and radio observations of the peculiar Z‐type neutron star X‐ray binary Cir X‐1, observed with the Rossi X‐ray Timing Explorer satellite and the Australia Telescope Compact Array in 2000 October and 2002 December. We identify typical Z‐source behaviour in the power density spectra as well as characteristic Z patterns drawn in an X‐ray hardness–intensity diagram. Power spectra typical of bright atoll sources have also been identified at orbital phases after the periastron passage, while orbital phases before the periastron passage are characterized by power spectra that are typical neither of Z nor of atoll sources. We investigate the coupling between the X‐ray and the radio properties, focusing on three orbital phases when an enhancement of the radio flux density has been detected, to test the link between the inflow (X‐ray) and the outflow (radio jet) to/from the compact object. In two out of three cases, we associate the presence of the radio jet to a spectral transition in the X‐rays, although the transition does not precede the radio flare, as detected in other Z sources. An analogous behaviour has recently been found in the black hole candidate GX 339‐4. In the third case, the radio light curve shows a similar shape to the X‐ray light curve. We discuss our results in the context of jet models, considering also black hole candidates.

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Section: Introductionmentioning

confidence: 99%

Linking jet emission and X-ray properties in the peculiar neutron star X-ray binary Circinus X-1

Soleri

Tudose

Fender

et al. 2009

Monthly Notices of the Royal Astronomical Society

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“…These discoveries included the systems LMC X-1 [43][44][45][46], LMC X-3 [43,47], GX 339−4 [48,49], and 4U 1957+11 [43,50, the "U" standing for Uhuru, an early 70's X-ray satellite that scanned much of the sky]. The first two objects reside approximately 50 kpc away in the nearby satellite galaxy, the Large Magellanic Cloud.…”

Section: The Identification Of Galactic Black Hole Candidates (Gbhcs)mentioning

confidence: 99%

Fluorescent iron lines as a probe of astrophysical black hole systems

2003

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“…The early observations showed that the source was extremely variable over time scales of 100 days, alternating between three states: a "high" state with a soft spectrum, a harder "low" state and an "off" state, which was later recognized as a low-flux extension of the low state (see [44]). The similarity of GX 339-4 and Cyg X-1 was also strengthened by the observation of similar strong aperiodic variability [82]. Since the names "low" and "high" derive from the 1-10 keV flux and the fluxes at higher energies reverse, I will refer to them as "low-hard" (LHS) and "high-soft" (HSS) respectively (see Chap.…”

Section: Introductionmentioning

confidence: 99%

States and Transitions in Black Hole Binaries

Belloni

2009

Lecture Notes in Physics

312

217

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Summary. With the availability of the large database of black-hole transients from the Rossi X-Ray Timing Explorer, the observed phenomenology has become very complex. The original classification of the properties of these systems in a series of static states sorted by mass accretion rate proved not to be able to encompass the new picture. I outline here a summary of the current situation and show that a coherent picture emerges when simple properties such as X-ray spectral hardness and fractional variability are considered. In particular, fast transition in the properties of the fast time variability appear to be crucial to describe the evolution of black-hole transients. Based on this picture, I present a state-classification which takes into account the observed transitions. I show that, in addition to transients systems, other black-hole binaries and Active Galactic Nuclei can be interpreted within this framework. The association between these states and the physics of the accretion flow around black holes will be possible only through modeling of the full time evolution of galactic transient systems.

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GX339–4: a new black hole candidate

Cited by 63 publications

References 10 publications

Linking jet emission and X-ray properties in the peculiar neutron star X-ray binary Circinus X-1

Linking jet emission and X-ray properties in the peculiar neutron star X-ray binary Circinus X-1

Fluorescent iron lines as a probe of astrophysical black hole systems

States and Transitions in Black Hole Binaries

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