Radio and X-ray states in the X-ray binary Scorpius X-1

Hjellming, R. M.; Stewart, R. T.; White, Graeme L.; Strom, R. G.; Lewin, W. H. G.; Hertz, P.; Wood, K. S.; Norris, J. P.; Mitsuda, K.; Penninx, W.; Paradijs, J. van

doi:10.1086/169522

Cited by 44 publications

(34 citation statements)

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“…Similarly, Bałucińska-Church et al (2011) found a 5σ upper limit of <150 μJy at 5 GHz in e-EVN observations in 2009, May. Sco X-1 on the other hand has both radio-loud and radio-weak states and weak radio emission has been detected when on the FB (Hjellming et al 1990b). This tends to support the prediction but clearly further testing is needed.…”

Section: A Model For the Sco X-1 Like Sourcesmentioning

confidence: 80%

Spectral investigations of the nature of the Scorpius X-1 like sources

Church

Gibiec

Bałucińska‐Church

et al. 2012

A&A

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We present results of spectral investigations of the Sco X-1 like Z-track sources Sco X-1, GX 349+2, and GX 17+2 based on Rossi-XTE (RXTE) observations determining spectral evolution along the Z-track. Results are obtained for a spectral model describing an extended accretion disk corona. The results are compared with previous results for the Cyg X-2 like group: Cyg X-2, GX 340+0, and GX 5-1 and a general model for the Z-track sources proposed. On the normal branch, the Sco-like and Cyg-like sources are similar, the results indicating an increase of mass accretion rateṀ between soft and hard apex, not as in the standard view that this increases monotonically around the Z. In the Cyg-like sources, increasingṀ causes the neutron star temperature kT to increase from ∼1 to ∼2 keV. At the lower temperature, the radiation pressure is small, but at the higher kT , the emitted flux of the neutron star is several times super-Eddington and the high radiation pressure disrupts the inner disk and launches the relativistic jets observed on the upper normal and horizontal branches. In the Sco-like sources, the main physical difference is the high kT of more than 2 keV on all parts of the Z-track suggesting jets are always possible, even on the flaring branch. The flaring branch in the Cyg-like sources is associated with a release of energy on the neutron star consistent with unstable nuclear burning. The Sco-like sources are very different as flaring appears to be a combination of unstable burning and an increase ofṀ which makes flaring much stronger. Analysis of 15 years of RXTE ASM data on all 6 classic Z-track sources shows the high rate and strength of flaring in the Sco-like sources suggesting that the continual release of energy heats the neutron star causing the high kT . Analysis of a Sco X-1 observation with unusually little flaring supports this. GX 17+2 appears to be transitional between the Cyg and Sco-like types. Our results do not support the suggestion that Cyg or Sco-like nature is determined by the luminosity.

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Section: A Model For the Sco X-1 Like Sourcesmentioning

confidence: 80%

Spectral investigations of the nature of the Scorpius X-1 like sources

Church

Gibiec

Bałucińska‐Church

et al. 2012

A&A

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“…It has been found that the behaviour of the radio jets correlates with the X-ray state. According to the unification of radio jets in NS Z-sources [20,27], the jets are absent in the flaring branch, present in the horizontal branch and discrete ejections are launched in the normal branch.…”

Section: New Optical Fast Timing Polarimetry Of Sco X-1 With Simultanmentioning

confidence: 99%

Rapid variations of polarization in low-mass X-ray binaries

Russell

Casella

Fender

et al. 2011

Proceedings of High Time Resolution Astrophysics (HTRA) IV - The Era of Extremely Large Telescopes — PoS(HTRA-IV)

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Time-resolved optical and infrared polarimetric observations of black hole and neutron star lowmass X-ray binaries are presented. Data were acquired with the VLT, UKIRT and HIPPO on the SAAO 1.9-m. We find that for some sources in outburst, a rapidly variable component of polarization is evident that is stronger in the redder wavebands. We attribute this to the polarimetric signature of synchrotron emission from jets in these systems, the emission of which is known to dominate these redder bands. Such synchrotron emission from jets launched close to black holes and neutron stars can be highly linearly polarized, depending on the configuration of the magnetic field. The variability of the polarization is suggestive of a tangled and turbulent magnetic field at the location of the compact jet. For some sources the position angle of polarization is consistent with a magnetic field that is parallel to the observed radio jet. These are some of the first observational constraints of the geometry and magnetic structure at the inner regions of the outflow. We also present the first ever simultaneous optical polarization and X-ray campaign of an X-ray binary, using data taken simultaneously with HIPPO and RXTE with sub-second time resolution.

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“…When the X-ray spectrum is hard (the hard state; see Belloni 2010) a continuous jet is thought to be produced, which can radiate synchrotron emission from radio frequencies to at least the optical/near-infrared (OIR) regime (e.g. Hjellming et al 1990, Russell et al 2007, Coriat et al 2009). Multiwavelength studies are required to attempt to isolate the synchrotron jet emission from other components such as thermal emission from the accretion disc and companion star or Comptonized radiation from the corona.…”

Section: Introductionmentioning

confidence: 99%

Isolating the jet in broadband spectra of XBs

et al. 2010

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Abstract. Most accretion-powered relativistic jet sources in our Galaxy are transient X-ray binaries (XBs). Efforts to coordinate multiwavelength observations of these objects have improved dramatically over the last decade. Now the challenge is to interpret broadband spectral energy distributions (SEDs) of XBs that are well sampled in both wavelength and time. Here we focus on the evolution of the jet in their broadband spectra. Some of the most densely sampled broadband SEDs of a neutron star transient (IGR J00291+5934) are used to constrain the optically thick-thin break in the jet spectrum. For the black hole transient XTE J1550-564, infrared -X-ray correlations, evolution of broadband spectra and timing signatures indicate that synchrotron emission from the jet likely dominates the X-ray power law at low luminosities (∼ (2 × 10 −4 -2 × 10 −3 ) L E dd ) during the hard state outburst decline.

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Radio and X-ray states in the X-ray binary Scorpius X-1

Cited by 44 publications

References 0 publications

Spectral investigations of the nature of the Scorpius X-1 like sources

Spectral investigations of the nature of the Scorpius X-1 like sources

Rapid variations of polarization in low-mass X-ray binaries

Isolating the jet in broadband spectra of XBs

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