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

Zdziarski, A. A.; Lubiński, P.; Gilfanov, M.; Revnivtsev, M.

doi:10.1046/j.1365-8711.2003.06556.x

Cited by 222 publications

(259 citation statements)

References 100 publications

(253 reference statements)

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“…It would then produce a "steeper when brighter" behavior as observed in Seyfert galaxies (e.g. Zdziarski et al 2003). Occasionaly, instead, the jet emission is both dominant and characterized by a flat spectrum, and we have then the opposite behavior, i.e.…”

Section: Summary and Discussionmentioning

confidence: 69%

Aborted jets and the X–ray emission of radio–quiet AGNs

Ghisellini

Haardt

Matt

2003

A&A

153

147

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Abstract. We propose that radio-quiet quasars and Seyfert galaxies have central black holes powering outflows and jets which propagate only for a short distance, because the velocity of the ejected material is smaller than the escape velocity. We call them "aborted" jets. If the central engine works intermittently, blobs of material may be produced, which can reach a maximum radial distance and then fall back, colliding with the blobs produced later and still moving outwards. These collisions dissipate the bulk kinetic energy of the blobs by heating the plasma, and can be responsible (entirely or at least in part) for the generation of the high energy emission in radio-quiet objects. This is alternative to the more conventional scenario in which the X-ray spectrum of radio-quiet sources originates in a hot (and possibly patchy) corona above the accretion disk. In the latter case the ultimate source of energy of the emission of both the disk and the corona is accretion. Here we instead propose that the high energy emission is powered also by the extraction of the rotational energy of the black hole (and possibly of the disk). By means of Montecarlo simulations we calculate the time dependent spectra and light curves, and discuss their relevance to the X-ray spectra in radio-quiet AGNs and galactic black hole sources. In particular, we show that time variability and spectra are similar to those observed in Narrow Line Seyfert 1 galaxies.

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Section: Summary and Discussionmentioning

confidence: 69%

Aborted jets and the X–ray emission of radio–quiet AGNs

Ghisellini

Haardt

Matt

2003

A&A

153

147

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“…The observed positive Γ -L X /L Edd correlation for these sources confirms our expectation. Additional bright sources with positive correlation are reported in Zdziarski & Grandi (2001) and Zdziarski et al (2003).…”

Section: The Correlation Of Individual Agnsmentioning

confidence: 82%

Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation

Yang

Xie

Yuan

et al. 2014

Monthly Notices of the Royal Astronomical Society

123

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We investigate the observed correlation between the 2-10 keV X-ray luminosity (in unit of the Eddington luminosity; l X ≡ L X /L Edd ) and the photon index (Γ) of the X-ray spectrum for both black hole X-ray binaries (BHBs) and active galactic nuclei (AGNs). We construct a large sample, with 10 −9 < ∼ l X < ∼ 10 −1 . We find that Γ is positively and negatively correlated with l X when l X > ∼ 10 −3 and 10 −6.5 < ∼ l X < ∼ 10 −3 respectively, while Γ is nearly a constant when l X < ∼ 10 −6.5 . We explain the above correlation in the framework of a coupled hot accretion flow -jet model. The radio emission always come from the jet while the X-ray emission comes from the accretion flow and jet when l X is above and below 10 −6.5 , respectively. More specifically, we assume that with the increase of mass accretion rate, the hot accretion flow develops into a clumpy and further a disc -corona two-phase structure because of thermal instability. We argue that such kind of two-phase accretion flow can explain the observed positive correlation.

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“…53 and 103 we obtained the following best fit parameters with the N H fixed at 1.05 × 10 23 cm −2 (using the model WABS in XSPEC): the photon index Γ = 1.59 ± 0.03 and the e-folding energy E c = 146 Poutanen & Svensson (1996). COMPPS is a highly accurate iterative scattering Comptonization model, in which subsequent photon scatterings are directly followed (see, e.g., Zdziarski et al 2000;Zdziarski et al 2003): this model has been extensively tested against Monte Carlo results. On the other hand, COMPTT is based on an approximate solution of the kinetic equation with some relativistic corrections, and the resulting spectra are only approximate (see, e.g., discussion in the appendix of Zdziarski et al 1996).…”

Section: Resultsmentioning

confidence: 99%

1E 1740.7–2942: Temporal and spectral evolution from INTEGRAL and RXTE observations

Santo¹,

Bazzano²,

Zdziarski

et al. 2005

A&A

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Abstract. We present results of the monitoring of the black hole candidate 1E 1740.7-2942 with INTEGRAL, in combination with simultaneous observations by RXTE. We concentrate on broad-band spectra from INTEGRAL/IBIS and RXTE/PCA instruments. During our observations, the source spent most of its time in the canonical low/hard state with the measured flux variation within a factor of two. In 2003 September the flux started to decline and in 2004 February it was below the sensitivity level of the INTEGRAL and RXTE instruments. Notably, during the decline phase the spectrum changed, becoming soft and typical of black-hole binaries in the intermediate/soft state.

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

Cited by 222 publications

References 100 publications

Aborted jets and the X–ray emission of radio–quiet AGNs

Aborted jets and the X–ray emission of radio–quiet AGNs

Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation

1E 1740.7–2942: Temporal and spectral evolution from INTEGRAL and RXTE observations

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