Constraining Jet-Disk Geometry and Radiative Processes in Stellar Black Holes XTE J1118 480 and GX 339-4 - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




Constraining Jet-Disk Geometry and Radiative Processes in Stellar Black Holes XTE J1118 480 and GX 339-4 - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We present results from modeling of quasi-simultaneous broad band radiothrough X-ray observations of the galactic stellar black hole BH transientX-ray binary XRB systems XTE J1118+480 and GX 339-4 using an irradiated disc+ compact jet model. In addition to quantifying the physical properties of thejet, we have developed a new irradiated disc model which also constrains thegeometry and temperature of the outer accretion disc by assuming a disc heatedby viscous energy release and X-ray irradiation from the inner regions. For thesource XTE J1118+480, which has better spectral coverage of the two in opticaland near-IR OIR wavelengths, we show that the entire broad band continuum canbe well described by an outflow-dominated model + an irradiated disc. Thebest-fit radius of the outer edge of the disc is consistent with the Roche lobegeometry of the system, and the temperature of the outer edge of the accretiondisc is similar to those found for other XRBs. Irradiation of the disc by thejet is found to be negligible for this source. For GX 339-4, the entirecontinuum is well described by the jet-dominated model only, with no disccomponent required. For the two XRBs, which have very different physical andorbital parameters and were in different accretion states during theobservations, the sizes of the jet base are similar and both seem to prefer ahigh fraction of non-thermal electrons in the acceleration-shock region and amagnetically dominated plasma in the jet. These results, along with recentsimilar results from modeling other galactic XRBs and AGNs, may suggest aninherent unity in diversity in the geometric and radiative properties ofcompact jets from accreting black holes.



Autor: D. Maitra, S. Markoff Univ. of Amsterdam, C. Brocksopp MSSL, M. Noble, M. Nowak MIT, J. Wilms Univ. of Erlangen-Nuremberg

Fuente: https://arxiv.org/







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