Correlations between X-ray and radio spectral properties of accreting black holes

By A. Zdziarski, P. Lubiński, M. Gilfanov, M. Revnivtsev. 2002

175 citations recorded by the source corpus.

We study correlations between the X-ray spectral index, the strength of Compton reflection, and X-ray and radio fluxes in accreting black holes (Seyferts and black hole binaries). We critically evaluate the evidence for the correlation of the X-ray spectral index with the strength of Compton reflection and consider in detail statistical and systematic effects that can affect it. We study patterns of spectral variability (in particular, pivoting of a power-law spectrum) corresponding to the X-ray index-flux correlation. We also consider implications of the form of observed X-ray spectra and their variability for interpretation of the correlation between the radio and X-ray fluxes. Finally, we discuss accretion geometries that can account for the correlations and their overall theoretical interpretations.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/4b954625f16591e9cef37e217dd68b6e5a8c6ee7

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In Astronomy and Astrophysics

Citations in the corpus

An Accretion-Jet Model for Black Hole Binaries: Interpreting the Spectral and Timing Features of XTE J1118+480 (2004, background): “Poutanen & Zdziarski (2002) and Zdziarski et al. (2003) have pointed out some difficulties with the jet proposal.”
A Fundamental plane of black hole activity (2003, background): “If the X-ray emission is produced by synchrotron radiation and there is no cooling break at longer wavelengths, such a power-law variability would imply a radio variability which is orders of magnitude larger than observed (see discussion in Zdziarski et al. 2003).”
Radio-loud Narrow-Line Type 1 Quasars (2006, background): “Furthermore, radio observations of NLS1 galaxies provide constraints on the coupling between jets and accretion disks (e.g., Zdziarski et al. 2003).”
Modelling the behaviour of accretion flows in X-ray binaries (2007, background): “This can give both a good qualitative and quantitative description of the spectral index–reflection correlation seen in the data, (Zdziarski, Lubiński & Smith 1999; Zdziarski et al. 2003) especially given the uncertainties in determining the amount of reflection.”
GRS 1915+105 and the Disc-Jet Coupling in Accreting Black Hole Systems (2004, background): “…supposed to arise in some form of Comptonization (e.g., Sunyaev & Titarchuk 1980, McClintock & Remillard 2004), in which case a clear connection between the “base” of the outflow and this Comptonizing corona is required (see discussions in Muno et al. 2001, Zdziarski et al. 2003, Fender 2004).”
A long hard look at MCG–6-30-15 with XMM-Newton (2002, background): “This poses aninteresting challenge to models of the origin of the primary X-rays which typically predict some luminosity-correlated variation in slope (e.g. Zdziarski et al. 2003).”
Simultaneous Chandra and RXTE Spectroscopy of the Microquasar H1743–322: Clues to Disk Wind and Jet Formation from a Variable Ionized Outflow (2004, background): “Zdziarski et al. (2003) have shown that when the disk is fully ionized, the reflected spectrum is nearly featureless and might therefore be confused with a zero-reflection scenario.”
Jet-dominated states: an alternative to advection across black hole event horizons in ‘quiescent’ X-ray binaries (2003, background): “This is at odds with the more standard view of the hard X-ray spectrum as being dominated by thermal Comptonisation from electrons with a temperature of ∼ 100 keV (e.g. Sunyaev & Titarchuk 1980; Poutanen 1998, Zdziarski et al. 2003).”
Hot Accretion Flows Around Black Holes (2014, background): “…both the solid angle subtended by the reflection material and the amount of relativistic smearing increase, consistent with the truncation radius moving in and thereby increasing the flux of soft photons irradiating the inner hot accretion flow (Gilfanov et al. 1999, Zdziarski et al. 2003).”
A radio-emitting outflow in the quiescent state of A0620−00: implications for modelling low-luminosity black hole binaries (2006, background): “In response to the criticism offered by several authors (e.g. Zdziarski et al. 2003; Heinz 2004; Maccarone 2005), the jet model has also been significantly improved over the past years.”
GX 339—4: the distance, state transitions, hysteresis and spectral correlations (2004, background): “As discussed in Zdziarski et al. (2003), the likely origin of the radio-X-ray flux correlation is the formation of the radio jet out from energetic particles in the hot inner flow (i.e., the base of the jet being that flow), which also radiates X-rays.”
A universal radio-X-ray correlation in low/hard state black hole binaries (2003, background): “Zdziarski et al. (2003) ascribe the correlation to a correspondence between the level of X–ray emission and the rate of ejection of radio–emitting blobs forming a compact jet.”