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- W1967538474 abstract "We have analyzed 200 Rossi X-ray Timing Explorer observations of the black hole candidate GX339 |$-$| 4, all from bright hard state periods between 1996 and 2005. The purpose of our study is to investigate the radiation mechanisms in the hard state of GX 339 |$-$| 4. The broadband 3-200keV spectra were successfully modeled by a simple analytic model, power-law with an exponential cut-off modified with a smeared edge. The obtained energy cut-off ( |$E_{rm {cut}}$| ) was distributed over 50-200keV, and the photon index over 1.4-1.7. We found a clear anti-correlation ( |$E_{rm {cut}} propto L^{-0.70pm0.06}$| ) between the X-ray luminosity ( |$L$| ) in 2-200keV and |$E_{rm {cut}}$| , when |$L$| is larger than |$7 times 10^{37}$| ergs |$^{-1}$| (assuming a distance of 8kpc), while |$E_{rm {cut}}$| is roughly constant at around 200keV when |$L$| is smaller than |$7 times 10^{37}$| ergs |$^{-1}$| . This anti-correlation remained unchanged by adopting a more physical thermal Comptonization model, which resulted in an anti-correlation that can be expressed as |$kT_{rm {e}} propto L^{-0.24pm0.06}$| . These anti-correlations can be quantitatively explained by a picture in which the energy-flow rate from protons to electrons balances with inverse Compton cooling." @default.
- W1967538474 created "2016-06-24" @default.
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- W1967538474 date "2008-06-25" @default.
- W1967538474 modified "2023-09-28" @default.
- W1967538474 title "Luminosity Dependence of the Electron Temperature in the Bright Hard State of the Black Hole Candidate GX 339–4" @default.
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- W1967538474 doi "https://doi.org/10.1093/pasj/60.3.637" @default.
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