Clear anti-correlation between luminosity and high energy cutoff in the low/hard state of the black hole candidate GX339-4

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dc.creatorMiyakawa, Takehiro G.
dc.creatorYamaoka, Kazutaka
dc.creatorYoshida, Atsumasa
dc.creatorSaito, Koji
dc.creatorDotani, Tadayasu
dc.creatorInoue, Hajime
dc.date2007-02-03
dc.date.accessioned2026-07-07T10:21:43Z
dc.date.available2026-07-07T10:21:43Z
dc.descriptionWe have analyzed the 171 RXTE data sets of the black hole candidate GX 339-4 in the low/hard state during its 1996--2005 outburst. All the broadband spectra were successfully modeled by a simple analytic model, power-law with an exponential cutoff. The obtained energy cutoff($E_{\rm{cut}}$) is distributed over 50--300 keV, and the photon index over 1.4-1.6. We found a clear correlation ($E_{\rm{cut}}$ is proportional to $L^{-0.75 \pm 0.04}$) between luminosity in 2-200 keV (L) and $E_{\rm{cut}}$ when L is larger than 5$\times 10^{37}$ erg $s^{-1}$, while $E_{\rm{cut}}$ is almost constant at 200 keV when L is smaller than 5$\times 10^{37}$ erg $s^{-1}$. This anti-correlation is unchanged by adopting the more physical model of thermal Comptonization by Sunyaev and Titarchuk, although a slightly different relation is obtained as the electron temperature is proportional to $L^{-0.23 \pm 0.02}$. These anti-correlations are qualitatively explained by a picture where the energy flow rate from protons to electrons balance with cooling due to inverse Compton scattering.
dc.description6 pages, 4 figures, Accepted for publication in the proceedings of VI Microquasar Workshop in 2006 (Como, Italy), editors: T. Belloni et al. (2006)
dc.identifierhttps://arxiv.org/abs/astro-ph/0702087
dc.identifierhttp://arxiv.org/abs/astro-ph/0702087
dc.identifierPoSMQW6:085,2006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175265
dc.subjectAstrophysics
dc.titleClear anti-correlation between luminosity and high energy cutoff in the low/hard state of the black hole candidate GX339-4
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