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• W1805623270 abstract "We present a publicly-available spectral model for thermal X-ray emission from a baryonic jet in an X-ray binary system, inspired by the microquasar SS 433. The jet is assumed to be strongly collimated (half-opening angle $Thetasim 1deg$) and mildly relativistic (bulk velocity $beta=V_{b}/csim 0.03-0.3$). Its X-ray spectrum is found by integrating over thin slices of constant temperature, radiating in optically thin coronal regime. The temperature profile along the jet and corresponding differential emission measure distribution are calculated with full account for gas cooling due to expansion and radiative losses. Since the model predicts both the spectral shape and luminosity of the jet's emission, its normalisation is not a free parameter if the source distance is known. We also explore the possibility of using simple X-ray observables (such as flux ratios in different energy bands) to constrain physical parameters of the jet (e.g. gas temperature and density at its base) without broad-band fitting of high-resolution spectra. We demonstrate this approach in application to Chandra HETGS spectra of SS 433 in its 'edge-on' precession phase, when the contribution from non-jet spectral components is expected to be low. Our model provides a reasonable fit to the 1-3 keV data, while some residuals remain at higher energies, which may be partially attributed to a putative reflection component. Besides SS 433, the model might be used for describing jet components in spectra of other Galactic XRBs (e.g. 4U 1630-47), ULXs (e.g. Holmberg II X-1), and candidate SS 433 analogues like S26 in NGC7793 and the radio transient in M82." @default.
• W1805623270 created "2016-06-24" @default.
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• W1805623270 date "2015-11-12" @default.
• W1805623270 modified "2023-10-17" @default.
• W1805623270 title "Thermal X-ray emission from a baryonic jet: a self-consistent multicolour spectral model" @default.
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• W1805623270 doi "https://doi.org/10.1093/mnras/stv2432" @default.
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